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Articles 8371 - 8400 of 11445

Full-Text Articles in Entomology

Expression And Induction Of Three Family 4 Cytochrome P450 (Cyp4)* Genes Identified From Insecticide-Resistant And Susceptible Western Corn Rootworms, Diabrotica Virgifera Virgifera, M. E. Scharf, S. Parimi, Lance J. Meinke, L. D. Chandler, Blair D. Siegfried Jan 2001

Expression And Induction Of Three Family 4 Cytochrome P450 (Cyp4)* Genes Identified From Insecticide-Resistant And Susceptible Western Corn Rootworms, Diabrotica Virgifera Virgifera, M. E. Scharf, S. Parimi, Lance J. Meinke, L. D. Chandler, Blair D. Siegfried

Department of Entomology: Faculty Publications

We have previously determined that cytochrome P450-based oxidation is involved in resistance to the insecticides methyl parathion and carbaryl in geographically distinct Nebraska western corn rootworm populations. Three new family 4 cytochrome P450 (CYP4) gene fragments (CYP4AJ1, CYP4G18 and CYP4AK1) were cloned and sequenced from insecticide-resistant and -susceptible western corn rootworms. Insecticide bioassays indicated the resistant population employed in this study was significantly resistant to the insecticides methyl parathion and carbaryl. CYP4AJ1 and CYP4G18 were cloned from both genomic PCR and RT-PCR products, although only CYP4AJ1 contains an intronic region. Alignments of inferred amino acid sequences with other homologous insect …

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Cross-Resistance And Resistance Longevity As Induced By Bean Leaf Beetle, Cerotoma Trifurcata And Soybean Looper, Pseudoplusia Includens Herbivory On Soybean, P. Srinivas, Stephen D. Danielson, C. Michael Smith, John E. Foster Jan 2001

Cross-Resistance And Resistance Longevity As Induced By Bean Leaf Beetle, Cerotoma Trifurcata And Soybean Looper, Pseudoplusia Includens Herbivory On Soybean, P. Srinivas, Stephen D. Danielson, C. Michael Smith, John E. Foster

Department of Entomology: Faculty Publications

Cross-resistance, and longevity of resistance, induced by the bean leaf beetle, Cerotoma trifurcata, was studied IN the soybean PI 227687 that exhibited induced response in earlier studies. Bean leaf beetle adults and soybean looper, Pseudoplusia includens, larvae were used to induce resistance and to determine beetle feeding preference. Beetles were collected from soybean fields 2 to 5 days prior to the feeding preference test. The level of cross-resistance induced by soybean looper herbivory to subsequent bean leaf beetle feeding was higher when compared to cross-resistance induced by bean leaf beetle herbivory against subsequent feeding by soybean looper. Further, …

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Decapitation Impacting Effect Of Topically Applied Chlorpyrifos On Acetylcholinesterase And General Esterases In Susceptible And Resistant German Cockroaches (Dictyoptera: Blattellidae), No-Joong Park, Shripat T. Kamble Jan 2001

Decapitation Impacting Effect Of Topically Applied Chlorpyrifos On Acetylcholinesterase And General Esterases In Susceptible And Resistant German Cockroaches (Dictyoptera: Blattellidae), No-Joong Park, Shripat T. Kamble

Department of Entomology: Faculty Publications

The effect of topically applied chlorpyrifos on acetylcholinesterase and other esterases in heads and decapitated bodies of CSMA and Crawford German cockroaches was examined with spectrophotometric enzyme assay and native polyacrylamide gel electrophoresis. The toxicity of chlorpyrifos was greatly reduced in decapitated CSMA male cockroaches with LD50 value 17.1-fold higher than that of normal CSMA cockroaches. Acetylcholinesterase activity from heads was significantly higher in the Crawford compared with the CSMA strain and did not change until 24 h after chlorpyrifos in vivo treatment in both strains. The p-nitrophenyl butyrate (NPB) esterase activities from both heads and decapitated bodies of …

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Arthropod Populations And Rice Yields In Direct-Seeded And Transplanted Lowland Rice In West Africa, I. O. Oyediran, E. A. Heinrichs Jan 2001

Arthropod Populations And Rice Yields In Direct-Seeded And Transplanted Lowland Rice In West Africa, I. O. Oyediran, E. A. Heinrichs

Department of Entomology: Faculty Publications

Two methods for planting rice in irrigated lowland were evaluated during the wet seasons of 1994 and 1995 to determine their effect on rice arthropod numbers, insect-caused rice plant damage, and rice grain yield. The six treatments tested were: hand transplanting of seedlings at spacings of 14 cm × 14 cm, 20 cm × 20 cm, and 30 cm × 30 cm; and direct-seeding of rice at 60 kg seeds ha–1, 90 kg seeds ha–1, and 120 kg seeds ha–1. The most abundant arthropods in the study were the diopsid flies, Diopsis longicornis Maquart …

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Occurrence Of Wolbachia In Selected Diabroticite (Coleoptera: Chrysomelidae) Beetles, Thomas L. Clark, Lance J. Meinke, Steven R. Skoda, John E. Foster Jan 2001

Occurrence Of Wolbachia In Selected Diabroticite (Coleoptera: Chrysomelidae) Beetles, Thomas L. Clark, Lance J. Meinke, Steven R. Skoda, John E. Foster

Department of Entomology: Faculty Publications

Wolbachia are a rickettsial type bacteria that have been implicated as a cause of reproductive disruption and alteration in many insect species. Polymerase chain reaction assays of the 16S rRNA gene were conducted to reveal the prevalence of Wolbachia in 14 Diabroticite species, 12 Diabrotica, and two Acalymma. Assays revealed the presence of Wolbachia infection in three Diabrotica species; D. virgifera virgifera LeConte (all 40 individuals), D. cristata (Harris) (three of 25 individuals), D. lemniscata LeConte (all 20 individuals), and the two Acalymma species, A. blandulum (LeConte) (all 20 individuals), A. vittatum (F.) (one of 20 individuals). The …

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Induction Of Resistance In Field Grown Soybean By The Bean Leaf Beetle, Cerotoma Trifurcata (Forster) (Coleoptera: Chrysomelidae), Parimi Srinivas, Stephen D. Danielson Jan 2001

Induction Of Resistance In Field Grown Soybean By The Bean Leaf Beetle, Cerotoma Trifurcata (Forster) (Coleoptera: Chrysomelidae), Parimi Srinivas, Stephen D. Danielson

Department of Entomology: Faculty Publications

A study was conducted during the summer of 1998 with soybean cultivar Colfax, germplasm line HC95-24MB and susceptible cultivar Williams 82 to investigate induced resistance in soybean. Bean leaf beetle adults were used to induce resistance in field and also in the dual-choice feeding preference tests that were done in the laboratory to assess induction. Pair-wise comparisons of leaflets from induced and control plants demonstrated that induced resistance was present. Preference index (PI) values were similar in the three soybean entries and were not significantly different. Further investigation is necessary to fully understand induced resistance under field conditions in soybean-insect …

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Pcr–Rflp Of The Mitochondrial Cytochrome Oxidase (Subunit I) Gene Provides Diagnostic Markers For Selected Diabrotica Species (Coleoptera: Chrysomelidae), Thomas L. Clark, Lance J. Meinke, John E. Foster Jan 2001

Pcr–Rflp Of The Mitochondrial Cytochrome Oxidase (Subunit I) Gene Provides Diagnostic Markers For Selected Diabrotica Species (Coleoptera: Chrysomelidae), Thomas L. Clark, Lance J. Meinke, John E. Foster

Department of Entomology: Faculty Publications

Adult and larval identification of Diabrotica can be difficult. Some adult identifications require considerable taxonomic experience while larvae of many Diabrotica species are morphologically indistinguishable. This study was conducted to determine whether 12 pest and non-pest Diabrotica species could be separated using polymerase chain reaction–restriction fragment length polymorphism (PCR–RFLP). A 1308 bp portion of the mitochondrial cytochrome oxidase subunit I gene (COI) was amplified using PCR and digested using several restriction endonucleases. Double digests of COI amplicons with AluI and MspI resolved on polyacrylamide gels revealed several diagnostic inter- and intraspecific polymorphisms. A key to the 12 species …

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Molecular Phylogeny Of Diabrotica Beetles (Coleoptera: Chrysomelidae) Inferred From Analysis Of Combined Mitochondrial And Nuclear Dna Sequences, Thomas L. Clark, Lance J. Meinke, John E. Foster Jan 2001

Molecular Phylogeny Of Diabrotica Beetles (Coleoptera: Chrysomelidae) Inferred From Analysis Of Combined Mitochondrial And Nuclear Dna Sequences, Thomas L. Clark, Lance J. Meinke, John E. Foster

Department of Entomology: Faculty Publications

The phylogenetic relationships of thirteen Diabrotica (representing virgifera and fucata species groups) and two outgroup Acalymma beetle species (Coleoptera: Chrysomelidae) were inferred from the phylogenetic analysis of a combined data set of 1323 bp of mitochondrial DNA (mtDNA) cytochrome oxidase subunit 1 (COI) and the entire second internal transcribed spacer region (ITS-2) of nuclear ribosomal DNA of 362 characters. Species investigated were D. adelpha, D. balteata, D. barberi, D. cristata, D. lemniscata, D. longicornis, D. porracea, D. speciosa, D. undecimpunctata howardi, D. u. undecimpunctata, D. virgifera virgifera, D. v. zeae, D. viridula, and outgroup A. blandulum and A. vittatum. Maximum …

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Female Sensitivity To Diet And Irradiation Treatments Underlies Sex-Mortality Differentials In The Mediterranean Fruit Fly, James R. Carey, Pablo Liedo, Hans-Georg Müller, Jane-Ling Wang, Brad Love, Lawrence G. Harshman, Linda Partridge Jan 2001

Female Sensitivity To Diet And Irradiation Treatments Underlies Sex-Mortality Differentials In The Mediterranean Fruit Fly, James R. Carey, Pablo Liedo, Hans-Georg Müller, Jane-Ling Wang, Brad Love, Lawrence G. Harshman, Linda Partridge

Lawrence G. Harshman Publications

Large-scale experiments on medflies that were subjected to sterilizing doses of ionizing radiation (plus intact controls) and maintained on either sugar-only or full, protein-enriched diets revealed that, whereas the mortality trajectories of both intact and irradiated male cohorts maintained on both diets are similar, the mortality patterns of females are highly variable. Mean mortality rates at 35 days in male cohorts ranged from 0.2 to 0.3 but in female cohorts ranged from 0.09 to 0.35, depending on treatment. The study reports three main influences: (a) qualitative differences exist in the sex–mortality response of medflies subjected to dietary manipulations and irradiation, …

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Identification Of A Defensin From The Hemolymph Of The American Dog Tick, Dermacentor Variabilis, Robert Johns, Daniel E. Sonenshine, Wayne L. Hynes Jan 2001

Identification Of A Defensin From The Hemolymph Of The American Dog Tick, Dermacentor Variabilis, Robert Johns, Daniel E. Sonenshine, Wayne L. Hynes

Biological Sciences Faculty Publications

Hemolymph from partially fed virgin Dermacentor variabilis females was collected following Borrelia burgdorferi challenge and assayed for antimicrobial activity against Bacillus subtilis and B. burgdorferi. A small inducible cationic peptide was identified by SDS-PAGE in the hemolymph of these ticks as early as 1h post challenge. Following purification by a three-step procedure involving sequential SepPak elution, reversed phase high performance liquid chromatography (RP-HPLC) and gel electrophoresis, the yield of the active peptide was approximately 0.1% of the total protein in the hemolymph plasma. The molecular weight, 4.2kDa, was determined by MALDI-TOF mass spectrometry. N-terminal sequencing by the Edman degradation …

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Firefly Flashing Is Controlled By Gating Oxygen To Light-Emitting Cells, G. S. Timmins, F. J. Robb, C. M. Wilmot, S. K. Jackson, H. M. Swartz Jan 2001

Firefly Flashing Is Controlled By Gating Oxygen To Light-Emitting Cells, G. S. Timmins, F. J. Robb, C. M. Wilmot, S. K. Jackson, H. M. Swartz

Dartmouth Scholarship

Although many aspects of firefly bioluminescence are understood, the mechanism by which adult fireflies produce light as discrete rapid flashes is not. Here we examine the most postulated theory, that flashing is controlled by gating oxygen access to the light-emitting cells (photocytes). According to this theory, the dark state represents repression of bioluminescence by limiting oxygen, which is required for bioluminescence; relief from this repression by transiently allowing oxygen access to the photocytes allows the flash. We show that normobaric hyperoxia releases the repression of light emission in the dark state of both spontaneously flashing and non-flashing fireflies, causing continual …

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Release Of Cotesia Flavipes Cameron For Biological Control Of Cereal Stemborers In Two Ecological Zones In Mozambique, D. Cugala, W. A. Overholt, L. Santos, D. Giga Jan 2001

Release Of Cotesia Flavipes Cameron For Biological Control Of Cereal Stemborers In Two Ecological Zones In Mozambique, D. Cugala, W. A. Overholt, L. Santos, D. Giga

All Peer-Reviewed Publications

Cotesiaflavipes Cameron (Hymenoptera: Braconidae), a gregarious larval endoparasitoid of Cliilo parleUus (Swinhoe) (Lepidoptera: Crambidae) and other stemborers in the Indo-Australian region, was released in Mozambique for the first time in 1996. Before its release, countrywide surveys on stemborers and their natural enemies were conducted in several places. However, all led to the same conclusion: that Ch. partellns was the most abundant stemborer at the majority of locations, and that the rate of larval parasitism was very low (< 5 %). To evaluate the effect of stemborer species composition on- the establishment of Co. flavipes, two releases were made at two agroecologically different sites during the 1998/1999 and 1999/2000 growing seasons. Cotesiaflavipes was recovered from all the three stemborer species found at each site during the season of release and a year later. However, the rates of parasitism were very low, ranging from 0.6 to 1.9 % on Cli. partellus, 3.2 % on Sesamia calamislis Hampson (Lepidoptera: Noctuidae) and 2.6 % on Busseolafiisca Fuller (Lepidoptera: Noctuidae). The native natural enemy, Cotesia sesamiae (Cameron) (Hymenoptera: Braconidae) was the most common larval parasitoid at the two sites. The recoveries of Co. flavipes during the release period and a year later indicate that this exotic parasitoid has become established at the two locations in the southern and central regipns of Mozambique, in spite of differences in stemborer species composition. However, it is too early to evaluate the impact of Co.flai'ipes on the stemborer populations. © 2001 ICIPE.

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Comparative Development, Longevity And Population Growth Of Exotic And Native Parasitoids Of Lepidopteran Cereal Stemborers In Kenya, J. C. Mbapila, W. A. Overholt Jan 2001

Comparative Development, Longevity And Population Growth Of Exotic And Native Parasitoids Of Lepidopteran Cereal Stemborers In Kenya, J. C. Mbapila, W. A. Overholt

All Peer-Reviewed Publications

Studies on the effect of temperature on the development, longevity and population growth of Cotesia flavipes Cameron and Cotesia sesamiae (Cameron) indicated that the development of both Cotesia spp. from oviposition to cocoon formation and adult emergence was inversely related to temperature. The longevity of the parasitoids was also inversely related to temperature. Both parasitoids lived longer when moisture and food (agar + honey/water) were provided. The mean number of females and total adult progeny produced by C. flavipes on two host species were, in most cases, higher than C. sesamiae. The intrinsic rate of natural increase of C. flavipes …

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Cereal Stemborer Species Complex And Establishment Of Cotesia Flavipes Cameron In Eastern Uganda, T. Matama-Kauma, S. Kyamanywa, J. A. Ocwang, C. O. Omwega, H. R. Willson Jan 2001

Cereal Stemborer Species Complex And Establishment Of Cotesia Flavipes Cameron In Eastern Uganda, T. Matama-Kauma, S. Kyamanywa, J. A. Ocwang, C. O. Omwega, H. R. Willson

All Peer-Reviewed Publications

Studies were conducted in two districts of eastern Uganda from 1997 to 1999 to introduce and monitor the establishment of an exotic parasitoid, Cotesia flavipes Cameron (Hymenoptera: Braconidae), for the control of the stemborer Chilo partellns (Swinhoe) (Lepidoptera: Pyralidae), and also to determine the stemborer species complex in maize and sorghum. The study confirmed the presence of four important stemborers, two pyralids Ch. parlellus and Eldana saccharina Walker and two noctuids, Busseola fusca Fuller and Sesamia calamistis Hampson. Chilo partellus was dominant, constituting 53-88% of stemborers found followed by B.fiisca at 8-37 %. The most abundant local parasitoid was the …

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The Chemical Ecology Of Host Location By Parasitoids Of African Stemborers, Linnet S. Gohole, Adele J. Ngi-Song Jan 2001

The Chemical Ecology Of Host Location By Parasitoids Of African Stemborers, Linnet S. Gohole, Adele J. Ngi-Song

All Peer-Reviewed Publications

During foraging, parasitoids of insect herbivores are aided by chemical compounds generally termed ‘infochemicals‘, to locate their hosts. The origin of the infochemicals varies; they may be derived from the herbivore itself or activities related to the biology of the herbivore, the host plant, or from interactions between the plant and the herbivore. This paper reviews the status of research in this area, and presents an account of the infochemicals used by African stemborer parasitoids during foraging, as well as recommending possible areas for further investigation. The information generated has potential for application in behaviour modification of parasitoids species in …

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Variation In Lipophorin Titres During Development In Solitarious And Gregarious Schistocerca Gregaria (Forskàl) (Orthoptera: Acrididae), D. O. Ogoyi, E. O. Osir Jan 2001

Variation In Lipophorin Titres During Development In Solitarious And Gregarious Schistocerca Gregaria (Forskàl) (Orthoptera: Acrididae), D. O. Ogoyi, E. O. Osir

All Peer-Reviewed Publications

The levels of lipophorin, the principal insect haemolymph lipoprotein, were estimated during the development of solitary and gregarious phases of Schistocerca gregaria using single radial immunodiffusion. In the gregarious phase, lipophorin titres ranged from 6.69 ±0.57 mg/ml in the 3rd nymphal instar to 14.42 ±2.04 mg/ml in mature adults. The titres in the solitary phase were 3.33 ± 0.59 mg/ml in the 3rd nymphal instar and 8.44 + 0.67 mg/ml in mature adults. Peak lipophorin titres occurred in mature adults (14.42 ±2.04 mg/ml) and 5th nymphal instar (8.75 ±0.25 mg/ml) for gregarious and solitary locusts, respectively. Gregarious locusts had significantly …

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Distribution And Species Composition Of Cereal Stemborers In The Eastern Zone Of Tanzania, E. Nsami, B. Pallangyo, V. Mcoo, C. O. Omwega Jan 2001

Distribution And Species Composition Of Cereal Stemborers In The Eastern Zone Of Tanzania, E. Nsami, B. Pallangyo, V. Mcoo, C. O. Omwega

All Peer-Reviewed Publications

A survey was conducted in the four regions of Tanga, Morogoro, Coast and Dar es Salaam in eastern Tanzania to determine the distribution and species composition of cereal stemborers and their natural enemies. A total of 22 fields were sampled in Tanga, 28 in Morogoro, 17 in Coast and one in Dar es Salaam. Chilo parlellns was found to be the predominant species, accounting for 80 % of all stemborers collected. Bnsseolafnsca, Sesamia calamistis and Chilo orichalcociliellus made up 15,4 and less than 1 % of the stemborers collected respectively. Infestation levels varied with the age of the plants, whereby …

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Farmers’ Perceptions Of Importance, Control Methods And Natural Enemies Of Maize Stemborers At The Kenya Coast, M. J. Bonhof, A. Van Huis, F. G. Kiros, N. Dlbogo Jan 2001

Farmers’ Perceptions Of Importance, Control Methods And Natural Enemies Of Maize Stemborers At The Kenya Coast, M. J. Bonhof, A. Van Huis, F. G. Kiros, N. Dlbogo

All Peer-Reviewed Publications

A survey among 240 resource-poor farmers at the Kenya coast indicated that insect pests were considered to be the main production constraint. Over 70% of respondents mentioned stemborers to be the most important insect pest. Unlike the eggs and adults, stemborer larvae and pupae were frequently seen by farmers. Alternative gramineous host plants for pests were common near maize fields and were often not destroyed until after the first rains. Nearly all farmers left dry stems and stubble in the field after harvest. Farmers knew of many methods for controlling stemborers, but only 32 and 56% of farmers in Kilifi …

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Distribution And Abundance, In Maize And Sorghum, Of Lepidopteran Stemborers And Associated Indigenous Parasitoids In Zanzibar, E. I. Nlyibigira, Z. S. Abdallah, W. A. Overholt Jan 2001

Distribution And Abundance, In Maize And Sorghum, Of Lepidopteran Stemborers And Associated Indigenous Parasitoids In Zanzibar, E. I. Nlyibigira, Z. S. Abdallah, W. A. Overholt

All Peer-Reviewed Publications

Studies to determine the relative abundance and distribution of stemborer species and their associated parasitoids in maize and sorghum were carried out during the 1995-1996 and 19992000 cropping seasons on Unguja and Pemba, the two main islands of Zanzibar. Three stemborer species were found on both islands in maize and sorghum, with the exotic species Chilo partellns (Swinhoe) (Crambidae) being the most abundant and widely distributed species, accounting for 75.3 % of stemborer attack. It was followed by Sesamia calamistis Hampson (Noctuidae) and C/i. oriclialcociliellus Strand (Crambidae). Stemborer abundance was significantly higher in Pemba (1.47 ± 0.20) than Unguja (0.85 …

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Biosystematics Of The Psyttalia Concolor Species Complex (Hymenoptera: Braconidae: Opiinae): The Identity Of Populations Attacking Ceratitis Capitata (Diptera: Tephritidae) In Coffee In Kenya, S. W. Kimani-Njogu, M. K. Trostle, R. A. Wharton, J. B. Woolley, A. Raspi Jan 2001

Biosystematics Of The Psyttalia Concolor Species Complex (Hymenoptera: Braconidae: Opiinae): The Identity Of Populations Attacking Ceratitis Capitata (Diptera: Tephritidae) In Coffee In Kenya, S. W. Kimani-Njogu, M. K. Trostle, R. A. Wharton, J. B. Woolley, A. Raspi

All Peer-Reviewed Publications

The identity of a species of Psyttalia, a parasitoid of tephritid fruit flies in Kenya, was investigated. Individuals reared from coffee infested with Ceratitis capitata (Wiedemann) (Medfly) and two other tephritid species in Kenya were compared with individuals of Psyttalia concolor (Szépligeti) from a laboratory culture in Italy used in augmentative biological control of olive fly, Bactrocera oleae (Gmelin). Reciprocal crosses showed full compatibility, with production of viable female offspring. A preliminary morphometric analysis demonstrated that most individuals originating from Italy could be separated from most of those from Kenya based largely on differences in overall size.

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Host Suitability Of Four Cereal Stem Borers (Lepidoptera: Crambidae, Noctuidae) For Different Geographic Populations Of Cotesia Sesamiae (Cameron) (Hymenoptera: Braconidae) In Kenya, Moses B. Mochiah, Adele J. Ngi-Song, William A. Overholt, M. Botchey Jan 2001

Host Suitability Of Four Cereal Stem Borers (Lepidoptera: Crambidae, Noctuidae) For Different Geographic Populations Of Cotesia Sesamiae (Cameron) (Hymenoptera: Braconidae) In Kenya, Moses B. Mochiah, Adele J. Ngi-Song, William A. Overholt, M. Botchey

All Peer-Reviewed Publications

This study focused on the suitability of four species of cereal stem borers for the development of five geographic populations of Cotesia sesamiae (Cameron). C. sesamiae, an indigenous larval parasitoid of gramineous stem borers, is widespread in Africa. Four stem borers, Chilo partellus (Swinhoe), Chilo orichalcociliellus Strand (Lepidoptera: Crambidae), Busseola fusca Fuller, and Sesamia calamistis Hampson (Lepidoptera: Noctuidae), were offered to C. sesamiae for oviposition. Parasitoid individuals originated from five locations in Kenya. Biological parameters such as developmental time, percentage parasitism, progeny production, mortality of immature parasitoids, and proportion of female progeny were compared across host species. The two populations …

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Greenhouse Trials Of New Bacillus Thuringiensis Isolates For Control Of Chilo Partellus Larvae In Sorghum, Michael Brownbridge Jan 2001

Greenhouse Trials Of New Bacillus Thuringiensis Isolates For Control Of Chilo Partellus Larvae In Sorghum, Michael Brownbridge

All Peer-Reviewed Publications

Eight new Bacillus thuringiensis Berliner (Bt) isolates originally recovered from different source materials and geographic locations in Kenya were tested against Chilo partellus (Swinhoe) on sorghum grown in a greenhouse. All isolates had been demonstrated previously to be toxic to this pest. Bt strains were cultured in a liquid growth medium and preserved as powders for experimental application. Three-week-old sorghum plants (4-6 leaves) were artificially infested with 20 neonate C. partellus and sprayed 24 h later with Bt suspensions. Non-infested sorghum and infested non-treated sorghum served as the comparative checks within each experimental trial. Plant development and dead-heart formation were …

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Distribution And Species Composition Of Stemborers And Their Natural Enemies In Maize And Sorghum In Ethiopia, Emana Getu, W. A. Overholt, E. Kairu Jan 2001

Distribution And Species Composition Of Stemborers And Their Natural Enemies In Maize And Sorghum In Ethiopia, Emana Getu, W. A. Overholt, E. Kairu

All Peer-Reviewed Publications

Surveys were conducted to determine the species composition of stemborers and their natural enemies in maize and sorghum in 1999 and 2000 in eastern, northern, southern and western Ethiopia. The six species of stemborers found attacking maize and sorghum were Cltilp partellus (Swinhoe) (Lepidoptera: Crambidae), Busseolafiisca Fuller, Sesamia calamistis Hampson (Lepidoptera: Noctuidae), S. nonagrioides botanephaga Tarns and Bowden (Lepidoptera: Noctuidae), Rhynchaenus niger (Horn) (Coleoptera: Rhynchophoridae) and Pissodes dubious (Stroöm) (Coleoptera: Rhynchophoridae). Twenty species of primary parasitoids of eggs, larvae and pupae of Ch. partellus, B. fusca and S. calamistis were recorded. Other natural enemies, including predators, fungi and nematodes, were …

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Aspects Of The Taxonomy And Ecology Of The Ground Beetle (Coleoptera: Carabidae) Assemblage Of The Swan Coastal Plain : (With Particular Reference To Habitat Fragmentation And The Quindalup Dune System), Nadine A. Guthrie Jan 2001

Aspects Of The Taxonomy And Ecology Of The Ground Beetle (Coleoptera: Carabidae) Assemblage Of The Swan Coastal Plain : (With Particular Reference To Habitat Fragmentation And The Quindalup Dune System), Nadine A. Guthrie

Theses: Doctorates and Masters

Long term studies encompassing seasonal variation in abundance and species present, forming base-line phenological data, arc required to understand the responses of the carabid (Ground Beetle) fauna to major habitat changes. In addition, few habitats unaffected by human disturbance remain in Australia, and evaluation of these fauna in these areas is required before further habitat loss occurs. Generally an unknown group of terrestrial predatory invertebrates in Australia, carabids have been the subjects of few ecological studies in this country. This restricts the utility of the Carabidae in environmental or conservation assessment programs in Australia. A study was initiated to assess …

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Nine New Species Of Lacinipolia (Noctuidae) From Arizona, California And Vicinity, Charles L. Selman, Ron Leuschner Dec 2000

Nine New Species Of Lacinipolia (Noctuidae) From Arizona, California And Vicinity, Charles L. Selman, Ron Leuschner

The Taxonomic Report of the International Lepidoptera Survey

This article formalizes the taxonomic conclusions of the senior author’s 1975 successful doctorate dissertation. The nine new species defined in that 1975 dissertation are here formally described in compliance with the rules of the International Code of Zoological Nomenclature (ICZN). The authors have essentially abstracted the original 447 page dissertation and designated types. The new Lacinipolia species are: delongi, aileenae, triplehorni, bucketti, baueri, sharonae, martini, fordi, and franclemonti. The purpose of this paper is simply to make these names available to the scientific community and professional researchers by making them ICZN-compliant.

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Records For The Utilization Of Prunus As A Larval Foodplant By 71 Species Of Lepidoptera In Northeast California, Laurence L. Crabtree, Ron Leuschner Dec 2000

Records For The Utilization Of Prunus As A Larval Foodplant By 71 Species Of Lepidoptera In Northeast California, Laurence L. Crabtree, Ron Leuschner

The Taxonomic Report of the International Lepidoptera Survey

Twenty-six sites in five northeastern California counties (Shasta, Modoc, Plumas, Lassen, Tehama) were surveyed from 1991 to 1999 for the presence of lepidopteran larvae on naturally occurring shrubs of the genus Prunus. To date, a total of seventy-one species of Lepidoptera from seventeen families have been documented to utilize one or more of the area’s three Prunus species (P. emarginata, P. subcordata, and P. virginiana var. demissa).

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A Taxonomic Study Of, And Key To, The Lecithoceridae (Lepidoptera) From Guizhou, China, Chunsheng Wu Dec 2000

A Taxonomic Study Of, And Key To, The Lecithoceridae (Lepidoptera) From Guizhou, China, Chunsheng Wu

The Taxonomic Report of the International Lepidoptera Survey

This paper provides a key to twelve species (in ten genera and three subfamilies) of Lecithoceridae from Guizhou Province, China. Among them, three species are unnamed and eight are new Guizhou Province records. The female of Opacoptera ecblasta Wu is known for the first time and its genitalia are illustrated for the first time.

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The Biology, Life History, And Taxonomy Of Celastrina Neglectamajor (Lycaenidae: Polyommatinae)., Harry Pavulaan, David M. Wright Dec 2000

The Biology, Life History, And Taxonomy Of Celastrina Neglectamajor (Lycaenidae: Polyommatinae)., Harry Pavulaan, David M. Wright

The Taxonomic Report of the International Lepidoptera Survey

The biology and life history of Celastrina neglectamajor is described. This lycaenid butterfly was first described from West Virginia, United States by 19th century lepidopterist, William H. Edwards, as a redescription of Lycaena pseudargiolus (Boisduval & Le Conte). Edwards provided evidence of its unique late spring flight, Appalachian affinity, and larval host Cimicifuga racemosa (Ranunculaceae). Edwards and subsequent authors, most notably Samuel Scudder of New England, treated it as an infrasubspecific form of the common eastern Celastrina ladon. In 1908 Tutt applied the form name neglectamajor, describing it from one of Edwards’ 1884 figures. For nearly a century, …

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Insect Pests And Beneficial Arthropod Populations Under Different Hedgerow Intercropping Systems In Semiarid Kenya, H. Girma, M. R. Rao, S. Sithanantham Dec 2000

Insect Pests And Beneficial Arthropod Populations Under Different Hedgerow Intercropping Systems In Semiarid Kenya, H. Girma, M. R. Rao, S. Sithanantham

All Peer-Reviewed Publications

Exploiting the principles of biological control of crop pests is an important management strategy for the resource-poor smallholder farmers of the tropics. The effects of nine hedgerow species on the abundance of major insect pests of beans and maize, and predatory/parasitic-arthropods were monitored over two cropping seasons and the intervening dry period. The tree/shrub species evaluated were Gliricidia sepium, Grevillea robusta, Senna siamea, Senna spectabilis, Flemingea congesta, Croton megalocarpus, Morus alba, Calliandra calothyrsus and Lantana camara. Arthropod abundance was monitored through counts of infested plants and using yellow pan and pitfall traps. Beanfly (Ophiomyia spp.) infestation was significantly higher in …

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Pycnomerus Thrinax, A New North America Zopherid (Coleoptera), Michael A. Ivie, Stanislaw Adam Slipinski Dec 2000

Pycnomerus Thrinax, A New North America Zopherid (Coleoptera), Michael A. Ivie, Stanislaw Adam Slipinski

Insecta Mundi

Pycnomerus thrinax Ivie and Slipinski NEW SPECIES is described from the Florida Keys (USA), where it is found in rotting stems of the thatch palm, Thrinax parviflora Sw. Illustrations and modifications to existing keys are provided.

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