Entomology Commons^™

Two Remarkable New Species Of Plusiotis (Coleoptera: Scarabaeidae: Rutelinae) From Mexico And Central America, Brett C. Ratcliffe, Mary Liz Jameson, Terry Taylor

University of Nebraska State Museum: Entomology Papers

Affinities, diagnoses, and descriptions are provided for two new species of Plusiotis: P. spectabilis from an unknown locality in Central America and P. dianae from Veracruz state in Mexico. Plusiotis spectabilis is described from a single female and is the largest species in the genus (41 mm in length).

Life Tables And Intrinsic Rate Of Natural Increase Of Pediobius Furvus [Hym.: Eulophidae] On Chilo Partellus [Lep.: Pyralidae], G. W. Oloo

All Peer-Reviewed Publications

In the present studies, life table data and intrinsic rate of natural increase (rm) of the eulophid pupal parasitoid, P. furvus (Gahan) were obtained from Chilo partellus (Swinhoe) at a constant temperature of 26.7±0.6°C, 52.3±2.7% RH in the laboratory. Development of immature stages took 19.1±0.3 days; adult females lived for 7.9±3.3 (range, 2-13) days and produced a mean of 91.9±22.4 progeny per female, with a sex ratio of 1:2.9 (♂:♀). The intrinsic rate of natural increase (rm) was 0.2558/female/day; the net reproductive rate (R0), 237.25; the capacity for increase (rc) of 0.252; and the finite rate of increase (λ) of …

Nine New Species And 11 Country Records Of Cyclocephala (Coleoptera: Scarabaeidae: Dynastinae) From Panama And Costa Rica, Brett C. Ratcliffe

University of Nebraska State Museum: Entomology Papers

Nine new species of Cyclocephala are described from Panama and/or Costa Rica. They are C. dissimulata, C. isthmiensis, C. nigritarsis, C. nike, C. pan, C. rorschachoides, C. santaritae, C. williami, and C. zodion. New country records for Panama and/or Costa Rica are given for C. ampliata Bates, C. atripes Bates, C. brittoni Endrodi, C. castaniella Bates, C. confusa Endrodi, C. kaszabi Endrodi, C. macrophylla Erichson, C. nigerrima Bates, C. porioni Dechambre, C. prolongata Arrow and C. quadripunctata Hohne.

Two New Species Of Cyclocephala From Arizona And Mexico And A Note On Melanistic C. Melanocephala (Coleoptera: Scarabaeidae: Dynastinae), Brett C. Ratcliffe

University of Nebraska State Museum: Entomology Papers

Cyclocephala aravaipensis n.sp. and C. warneri n.sp. are described from Arizona, U.S.A. and Chiapas, Mexico, respectively. An unusual melanistic form of C. melanocephala (Fab.) is reported from two localities in northeastern Quintana Roo, Mexico.

The Biogeography And Phylogeny Of Hologymnetis (Coleoptera: Scarabaeidae: Cetoniinae) With A Revision Of The Genus, Brett C. Ratcliffe, A. Cuauhtemoc Deloya

University of Nebraska State Museum: Entomology Papers

The Neotropical genus Hologymnetis (formerly Cineretis) is comprehensively reviewed. Descriptions and a key to the seven species are presented, including three new species (H. kinichahau from Guatemala and Mexico, H. moroni from Mexico, and H. vulcanorum from El Salvador). Hologymnetis margaritis is restored to species status. A cladistic analysis reconstructing the presumed phylogeny of the genus is provided, and a discussion of the characters and their states is given. Hologymnetis cinerea and H. undulata were found to be the most derived species, while H. vulcanorum, H. margaritis and H. kinzchahau are the least derived; H. moroni and …

A New Species Of Ancognatha From Panama (Coleoptera: Scarabaeidae: Dynastinae), Brett C. Ratcliffe

University of Nebraska State Museum: Entomology Papers

Ancognatha vexans is described as new from the mountains of Chiriqui Province in western Panama. It is distinguished from similar species, and its diagnostic characters are illustrated.

Nebline, February 1992

NEBLINE Newsletter Archive from Nebraska Extension in Lancaster County

Ag Update: Agricultural News & Events

Home Extension News

On-the-Grow: Horticulture News & Recommendations

The Cloverline: 4-H News and Events

Extension Calendar

and other extension news

Hexapod Herald - Vol. 3, No. 1, January 21, 1992

Hexapod Herald and Other Entomology Department Newsletters

Publications

Graduate students

Spring semester courses

Grants

Congratulations

Departmental travelers

Miscellaneous

Bruner Club

Calendar of events

New Nebraska Occurrences Of The Endangered American Burying Beetle (Coleoptera: Silphidae), Brett C. Ratcliffe, Mary Liz Jameson

University of Nebraska State Museum: Entomology Papers

Six new records for the endangered American burying beetle, Nicrophorus americanus Olivier, are reported from the Nebraska Sandhills. Nebraska is one of only four states in the United States where this beetle remains extant.

Attraction Of Douglas-Fir Beetle, Spruce Beetle And A Bark Beetle Predator (Coleoptera: Scolytidae And Cleridae) To Enantiomers Of Frontalin, B. S. Lindgren

The Bark Beetles, Fuels, and Fire Bibliography

In three separate experiments, Douglas-fir beetles, Dendroctonus pseudotsugae Hopkins, preferred traps baited with either (S)-(-)- or racemic (R,S)-(±)-frontalin over those baited with the (R)-(+)-enantiomer. Spruce beetles, D. rufipennis (Kirby), appeared to be attracted equally to both the (S)-(-)- and (R)-(+)-enantiomers, but low catches and high variance made interpretation of the data tenuous. For both species racemic frontalin was as attractive as the preferred enantiomer alone. The bark beetle predator,Thanasimus undatulus (Say), was attracted preferentially to (S)-(-)-frontalin over (R)-(+)- or (R,S)-(±)-frontalin in a Douglas-fir stand, while both enantiomers were equally attractive in a spruce stand.

Enterprise Projects: Experiential Learning In Applied Entomology, Mark D. Shelton

Office of the Dean (CAFES) Scholarship

During 1924, when jobs for college students were difficult to find in San Luis Obispo, Calif., a group of entrepreneurial students at the California Polytechnic School negotiated an $80 bank loan from a local lender to raise chickens. Parents and college faculty cosigned the loan, and thus was born the Agricultural Enterprise Program.

The Effects Of Varying Orientation To Light And Wind On Temperature Excess In The Dragonfly Belonia Saturata, James Eric Dunn

Theses Digitization Project

No abstract provided.

Nebline, January 1992

NEBLINE Newsletter Archive from Nebraska Extension in Lancaster County

Ag Update: Agricultural News & Events

Home Extension News

On-the-Grow: Horticulture News & Recommendations

The Cloverline: 4-H News and Events

Extension Calendar

and other extension news

Department Of Entomology Newsletter - No. 6, 1992

Hexapod Herald and Other Entomology Department Newsletters

This Sixth Newsletter of the Department of Entomology University of Nebraska is Sincerely Dedicated to the memories of: Robert E. Roselle and Jerold H. L. Bell

Extension News, Fred Baxendale

Teaching News, J. Ackland Jones

Research News, Z. B. Mayo

Museum News, Brett C. Ratcliffe

South Central Research and Extension Center News, Robert J. Wright

West Central Research and Extension News, John B. Campbell

Northeast Research and Extension News, John F. Witkowski

Panhandle Research and Extension News, Gary l. Hein

Lawrence Bruner Entomology Club

Linnaean Games Team News, Robert Wright, Coach

Recent Retirements

FACULTY / Baxendale, Fred P., Associate Professor …

Test Detects Resistant Green Peach Aphids In Lupins, Francoise Berlandier, Ian Dadour

Journal of the Department of Agriculture, Western Australia, Series 4

Confirmation of insecticide resistance in green peach aphid in Western Australia's lupin crops means farmers will have to choose insecticides much more carefully to control this pest. Resistance within an aphid population varies, and when resistant aphids are no longer exposed to insecticides, they may revert back to being susceptible in as little as one generation. Furthermore, when these revertant populations are exposed to the same insecticides in the future, resistance quickly reoccurs. In this article, the authors discuss a test to determine the extent of insecticide resistance in green peach aphid and how to manage it.

Effects Of Hypoxia On Egg Development In The Giant Waterbug (Belostoma Flumineum), Miki Furuya

Masters Theses

I quantified the oxygen requirements of developing eggs and the adaptive significance of male brooding behavior in the giant waterbug (Belostoma flumineum). Egg pads brooded by males, and egg pads experimentally removed from the dorsa of males and maintained in a metabolic shaker, were tested for hatching success in four oxygen treatments (5%, 8%, 10% and 21%-control) in a closed laboratory system. All of the control male brooded egg pads, and 100% of the eggs/pad, hatched whereas none of the egg pads hatched in the 5% oxygen treatment. Fifteen of 20 (75%) male brooded egg pads in the 10% oxygen …

First Report Of The Chinch Bug (Heteroptera: Lygaeidae) Egg Parasitoid Eumicrosoma Beneficum Gahan (Hymenoptera: Scelionidae) In Nebraska, Robert Wright, Stephen D. Danielson

Department of Entomology: Faculty Publications

A scelionid wasp, Eumicrosoma beneficum Gahan, was reared from chinch bug, Blissus leucopterus leucopterus (Say), eggs collected from wheat (Triticum aestivum L.) near Odell, Nebraska, in June 1989. Three-hundred twenty-one of 680 chinch bug eggs (47.2%) were parasitized by E. beneficum. Based on a subsample of 92 wasps the population was 64.1% female. This is the first report of this wasp from Nebraska.

Disruption Of Glossina Morsitans Morsitans (Diptera: Glossinidae) Eclosion Behaviour: A Novel Method For Evaluating The Action Of Neurotoxic Agents, J. Ždárek, D. L. Denlinger

All Peer-Reviewed Publications

As the tsetse fly, Glossina morsitans morsitans Westwood extricates itself from the puparium and moves upward through the soil the ptilinum expands and contracts rhythmically and thus generates a stereotypic behavioural pattern that persists for up to 10 h if the tsetse fly remains confined. The response, which is easily recorded tensometrically from the movements of the ptilinum, can be exploited as a tool for evaluating the behavioral response of tsetse flies to various neurotoxic agents. The behavioural assay proves useful in providing precise information about the latency of the response and lethal time, and can suggest likely modes of …

Influence Of Maize Row Spacing On Infestation And Damage Of Intercropped Beans By The Bean Aphid (Aphis Fabae Scop.). I. Incidence Of Aphids, M. W. Ogenga-Latigo, J. K.O. Ampofo, C. W. Baliddawa

All Peer-Reviewed Publications

Investigations were carried out in the field and in the glasshouse to asses the influence of row spacing of intercrop maize on the incidence of the bean aphid, Aphis fabae Scop. (Homoptera: Aphididae), on common beans, Phaseolus vulgaris L., and on aphid dispersal within the intercrops. Maize was planted in the field twice at a 3-week interval, at row spacings of 0.5, 1.0, 1.5 and 2.0 m, while sole and intercropped beans were planted simultaneously with the second maize, at a row spacing of 0.5 m. Aphis fabae incidence was lower on beans intercropped with densely planted maize, with strong …

Field Evaluation Of Tilapia Zilli (Gervais) As A Biological Control Agent For Mosquito Control, E. J. Asimeng, M. J. Mutinga

All Peer-Reviewed Publications

Tilapia zilli (Gervais), a larvivorous fish identified in the Mwea Rice Irrigation System (Kenya), was evaluated in the field to assess its potential for biological control of mosquito larvae. The study was conducted from October 1991 to April 1992 in experimental ponds constructed at Mbui-Njeru, which is one of the 36 villages in the irrigation scheme. T. zilli was found to be extremely effective in controlling mosquito breeding that persisted throughout the study period. However, the presence of vegetation and turbidity significantly reduced its efficiency in predation. The negative effects of vegetation could be averted by combining T. zilli with …

Factors Affecting Seasonal Dispersal Of The Tsetse Flies Glossina Pallidipes And G. Longipennis (Diptera: Glossinidae) At Nguruman, South-West Kenya, R. Brightwell, R. D. Dransfield, B. G. Williams

All Peer-Reviewed Publications

Seasonal changes in the distribution of the tsetse flies, Glossina pallidipes Austen and G. longipennis Corti, along a transect from riverine thickets out into open plains were monitored along with tsetse density, climatic factors, vegetation and host abundance. Dispersal of tsetse into open country was quantified using the mean spread. During and after the rains both species extended their distribution out into open country up to at least 3.5 km from riverine thicket areas. The mean spread of G. longipennis was greater than that of G. pallidipes. The spread of males and females was very similar, as was the spread …

Oviposition, Larval Arrest And Establishment Of Chilo Partellus (Lepidoptera: Pyralidae) On Maize Genotypes During Anthesis, Harish Kumar

All Peer-Reviewed Publications

The oviposition, larval arrest and establishment by the stem borer Chilo partellus (Swinhoe) were measured on different maize genotypes during anthesis. The maize genotypes tested were: Inbred A (Susceptible), Mp 704, MBR-8637, MBR-8650, MBR-8668, Poza Rica 7832, ER-29 SVR, Katumani Composite B, MMV 400, Bulk CG 4141, and ICZ2-CM. The moths oviposited on the middle leaves of the plant and the neonate larvae moved to leaf sheaths and ear husks to feed (arrest). As they grew older, the larvae invaded the stem, ear shanks and tassel to complete feeding (establishment) and to pupate. The response of the stem borer differed …

Studies On Tsetse Midgut Factors That Induce Differentiation Of Bloodstream Trypanosoma Brucei Brucei In Vitro, M. O. Imbuga, E. O. Osir, V. L. Labongo, N. Darji, L. H. Otieno

All Peer-Reviewed Publications

An in vitro system for studying the transformation of bloodstream forms of Trypanosoma brucei brucei into procylic (midgut) forms is described. In this system, transformation of the parasites was stimulated by Glossina morsitans morsitans midgut homogenates at 27° C but not at 4° C. The transformation-stimulating capacity was irreversibly destroyed by heating the midgut homogenates at 60° C for 1 h. A correlation was established between the transformation activity of the midgut homogenates and trypsin activity. The protease inhibitors (soybean trypsin inhibitor and N-p-tosyl-l-lysine-chloromethyl-ketone) inhibited trypsin activity and completely blocked the transformation of the parasites. Furthermore, the midgut homogenates could …

Influence Of Maize Row Spacing On Infestation And Damage Of Intercropped Beans By The Bean Aphid (Aphis Fabae Scop.). Ii. Reduction In Bean Yields, M. W. Ogenga-Latigo, C. W. Baliddawa, J. K.O. Ampofo

All Peer-Reviewed Publications

Field studies were conducted to assess the effects of intercropping common beans (Phaseolus vulgaris L.) with maize (Zea mays L.), at two growth stages and four row spacings (0.5, 1.0, 1.5 and 2.0 m), on Aphis fabae infestation of beans and on the magnitudes of bean yield losses due to aphid attack and to competition by maize. The first maize planting (Old maize) was carried out 3 weeks earlier than beans, while the second planting (Young maize) was done simultaneously with beans. Significantly (P < 0.05) fewer plants were infested by A. fabae when beans were intercropped with older or densely planted maize. Aphid colonies on beans were also smaller, and there was reduced aphid damage to beans in the intercrops. However, whereas bean yield loss from aphid attack was less than 3.5% in all intercrop situations, yield loss from competition by maize was very high, being up to 98% when beans were intercropped with early-planted maize at 0.5-m row spacing. Yields of intercropped maize planted at row spacings of 0.5, 1.5 and 2.0 m were also depressed. The results show that both maize growth and row spacing could be exploited for the control of A. fabae on intercropped beans. However, adequate consideration must be given to the negative effects of maize planting density and growth on yields of both crops. © 1992.

The Sheep Lice Detection Test, Peter Morcombe

Journal of the Department of Agriculture, Western Australia, Series 4

Sheep farmers would agree it is difficult to find sheep lice when carrying out an inspection.

The lice detection test makes this task easier and helps farmers decide how to control lice. The test also helps community liaison groups with eradication of lice infestations in specific areas, and provides data for epidemiologists to monitor changes in prevalence of lice and efficacy of treatments. Tests are much cheaper than flock inspection on the farm.

The present lice detection test was developed by the Australian Wool Testing Authority (A WTA) and introduced as an integral part of the Western Australian Sheep Lice …

Field Worker Exposure To Selected Insecticides Applied To Com Via Center-Pivot Irrigation, Shripat T. Kamble, Matthew E. Byers, John F. Witkowski, Clyde L. Ogg, Gerald W. Echtenkamp

Department of Entomology: Faculty Publications

Field workerswere monitored for dermal and respiratory exposure to chlorpyrifos (with and without crop oil), carbaryl, and permethrin at reentry intervals of 2, 4, 8, 24, and 48 h after application. Insecticides were applied to R3 stage corn through an overhead center-pivot irrigation system. Dermal exposure was measured by analyzing 18 gauze pads attached to the clothing of workers to represent human body regions. Hand exposure was determined using cotton gloves. Respiratory exposure was determined using portable air samplers equipped with polyurethane foam plugs to trap ambient insecticide residues. Gas liquid chromatography was used to quantify residues of chlorpyrifos and …

Proposed System Of Nomenclature For Biotypes Of Hessian Fly (Diptera: Cecidomyiidae) In North America, F. L. Patterson, John E. Foster, H. W. Ohm, J. H. Hatchett, P. L. Taylor

Department of Entomology: Faculty Publications

Twenty genes in wheat, Triticum spp., for resistance to Hessian fly, Mayetiola destructor (Say),have been previously designated H1 to H20. The location on wheat chromosomes of some of the genes is known, but several have not yet been assigned to specific chromosomes. Four wheat differential cultivars have been used to identify 16 possible biotypes of Hessian fly; biotypes were designated GP and A-O. If an additional differential host genotype were added, it is apparent that there are not enough letters in the alphabet to designate all of the biotypes. Therefore, a new system of biotype designation is proposed. Three …

Mitochondrial Transfer Rna Genes In A Black Fly, Simulium Vittatum (Diptera: Simuliidae), Indicate Long Divergence From Mosquito (Diptera: Culicidae) And Fruit Fly (Diptera: Drosophilidae), K. P. Pruess, X. Zhu, T. O. Powers

Department of Entomology: Faculty Publications

Sequences are given for nine complete genes and one partial mitochondrial tRNA gene of the black fly, Simulium vittatum (Zetterstedt). Sequenced tRNA genes were for alanine, arginine, asparagine, aspartic acid, glutamic acid, glycine, leucine(CUN), lysine, serine(AGN), and valine. Nucleotides were aligned with the same previously sequenced genes in Aedes albopictus Skuse and Drosophila yakuba Burla. A cluster of six tRNA genes, which differ in arrangement in Ae. albopictus and D. yakuba, was amplified by PCR and found to have the same position and orientation in S. vittatum as in D. yakuba. Overall, similarity with either D. yakuba or …

Sensitivity To 2,4-D In Sunflower As An Indicator Of Tolerance To The Sunflower Midge (Diptera: Cecidomyiidae), Marc D. Anderson, Gary J. Brewer

Department of Entomology: Faculty Publications

Nine sunflower hybrids were evaluated for their sensitivity to 2,4-dichlorophenoxyacetic acid (2,4-D) as measured by the production of ethylene. Sensitivity to 2,4-D was then compared with the degree of field tolerance to the sunflower midge, Contarinia schulzi Gagné, exhibited by each hybrid. For the hybrids evaluated, ethylene production increased with 2,4-D concentration and sensitivity to 2,4-D was inversely proportional to midge tolerance. The procedure may be useful in identifying midge tolerant germplasm.

On The Trail Of The Native Budworm, Kevin Walden

Journal of the Department of Agriculture, Western Australia, Series 4

Native budworm, the worst pest of lupins, is a bit of a uiill-o-the-unsp. Some years the native budworm moths go virtually unnoticed. In others, they appear in plague proportions without warning - in these years, the cost to growers in lost yield runs into millions of dollars.

If an early warning system can be developed to predict the extent of moth flights into lupin crops, and this seems possible, major crop losses could be averted.

The Department of Agriculture has started research to develop a system of predicting the size of spring flights of native budworm moth. We need to …