Entomology Commons^™

Host Plant Selection By Helicoverpa Armigera (Lepidoptera: Noctuidae): The Role Of Some Herbivore Attributes, S. Firempong, M. P. Zalucki

All Peer-Reviewed Publications

The effect of various ‘herbivore’ attributes on oviposition in Helicoverpa armigera were considered in a series of laboratory experiments. Larval diet did not influence the rank order of adult host preference, but early adult experience around a host increased oviposition on that host in subsequent trials. The presence of eggs laid 12 h before did not influence subsequent oviposition on a plant, although newly laid eggs may have. The presence of larvae, larval damage to plants and larval frass reduced oviposition on a plant. These results are discussed in relation to polyphagy in H. armigera. © 1991, CSIRO. All rights …

Electrophoretic Study Of Enzymes From A Glossina Fuscipes Fuscipes Newstead Population From Western Kenya, G. F. Rajendram

All Peer-Reviewed Publications

Enzymes were investigated, by electrophoresis, in a population of Glossina fuscipes fuscipes Newstead collected from Rusinga Island in Lake Victoria, Western Kenya. The following enzymes were tested: glucose phosphate isomerase. glucose-6-phosphate dehydrogenase (G6PDH). hexokinase, isocitrate dehydrogenase (IDH), malate-dehydrogenase (MDH), phosphoglucomutase, and xanthine dehydrogenase (XDH). Single monomorphic bands were stained by the following enzymes apparently under the control of single loci: G6PDIL MDH, and XDH. The enzyme IDH showed two bands with very close mobilities and no variation among individuals in the population. Hence IDH was considered as representing a single locus. Glucose phosphate isomerase manifested three alleles and apparently six …

Feeding Responses Of Chilo Partellus (Swinhoe) (Lepidoptera: Pyralidae) Larvae To Sorghum Plant Phenolics And Their Analogs, Baldwyn Torto, Ahmed Hassanali, Kailash N. Saxena, Sagary Nokoe

All Peer-Reviewed Publications

Phagostimulatory responses of third-instar larvae of Chilo Partellus to phenolic components identified in an ethyl acetate extract of the leaf whorls of 3-week-old plants of Sorghum bicolor cultivar IS 18363 were studied in no-choice bioassays. The major components in the extract were identified as 4-hydroxybenzaldehyde and 4-hydroxybenzoic acid, with 4-hydroxy-3-methoxycinnamic acid, 3,4-dihydroxycinnamic acid, and 4-hydroxycinnamic acid present in minor amounts. All but 4-hydroxycinnamic acid were stimulatory at the doses tested. 4-Hydroxybenzaldehyde was more stimulatory than other potential biogenetic analogs. Hydroxybenzoic acids generally elicited greater feeding response than cinnamic acids, and the pattern of oxygen substitution in the benzene ring was …

Mechanisms Of Resistance In Wild Rice Oryza Brachyantha To Rice Leaffolder Cnaphalocrocis Medinalis (Guenée) (Lepidoptera: Pyralidae), R. Ramachandran, Z. R. Khan

All Peer-Reviewed Publications

A wild rice, Oryza brachyantha, was rated as highly resistant to rice leaffolder, Cnaphalocrocis medinalis (Guenée), while its F1 hybrid from a cross with a high-yielding, leaffolder-susceptible rice, IR31917-45-3-2, was rated resistant in a standard screening test. In comparison with IR31917-45-3-2, O. brachyantha and the F1 hybrid were unsuitable for oviposition, survival, and growth of C. medinalis. However, growth and survival of larvae in artificial diets containing lyophilized leaf powder of IR31917-45-3-2 and O. brachyantha were comparable. Studies on the feeding and settling preference of the larval stages suggested that the mechanism of resistance of O. brachyantha is that of …

Enhancement Of Diapause Development In A Stem Borer, Busseola Fusca (Lep.: Noctuidae) By Dry Conditions, Takashi Okuda

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Water was an important factor for diapause termination only during the late stage of the diapause in Busseola fusca. Exposure to dry conditions for 2 months accelerated diapause development more. Diapause development proceeded at warm temperatures only. © 1991, JAPANESE SOCIETY OF APPLIED ENTOMOLOGY AND ZOOLOGY. All rights reserved.

Trap-Catches, Nutritional Condition And The Timing Of Activity Of The Tsetse Fly Glossina Longipennis (Diptera: Glossinidae), Sarah E. Randolph, D. J. Rogers, R. D. Dransfield, R. Brightwell

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Samples of Glossina longipennis Corti, taken over four days in traps (baited with acetone, cow urine and octenol) at half-hourly intervals during their restricted activity periods at dusk and dawn, were analysed for their nutritional condition. For both sexes, trap catches were highest at the end of dusk, between 19.00 and 19.30 h, associated with a significant increase in numbers with the low haematin content characteristic of flies estimated to have fed more than 60 hours previously. Also, the mean fat content of these flies was significantly lower than that of those trapped earlier. There was considerable day-to-day variation in …

Monitoring Secondary Outbreaks Of The African Armyworm In Kenya Using Pheromone Traps For Timing Of Bacillus Thuringiensis Application, M. Broza, M. Brownbridge, B. Sneh

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The arrival of male moths of the African armyworm, Spodoptera exempta Walker, was monitored in Kenya using pheromone traps. Peak trap counts were obtained during March 1989, and were concentrated in three out of nine traps distributed in small farms in an area of 625 km2 in Lambwe valley, South Nyanza. Large numbers of egg masses were located on dry stalks of last year's cereals in wild cynodon grass situated around the crop fields. Smaller numbers were found on the underside of the first emerged leaves of maize seedlings. Few egg masses were found on millet crops. Application of a …

Lipophorin From The Tsetse Fly, Glossina Morsitans Morsitans, James O. Ochanda, Ellie O. Osir, Edward K. Nguu, Norah K. Olembo

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1. 1. Lipophorin was isolated from the haemolymph of adult tsetse fly, Glossina morsitans morsitans, by ultracentrifugation in a potassium bromide density gradient. 2. 2. The tsetse fly lipophorin (Mr {reversed tilde equals} 600,000) has a density of {reversed tilde equals} 1.11 g/ml and consists of two apoproteins, apolipophorin-I (apoLp-I, Mr {reversed tilde equals} 250,000) and apolipophorin-II (apoLp-II, Mr {reversed tilde equals} 80,000), both of which are glycosylated as shown by staining with periodate-Schiff reagent. The protein complex is composed of 49% protein and 51% lipids. 3. 3. The finding of lipophorin in tsetse fly haemolymph suggests that, although these …

Infection Rates In Glossina Morsitans Morsitans Fed On Waterbuck And Boran Cattle Infected With Trypanosoma Congolense, Steve Mihok, Reardon O. Olubayo, David F. Wesonga

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Teneral Glossina morsitans morsitans were fed on waterbuck (Kobus defassa) and Boran cattle (Bos indicus) infected experimentally with Trypanosoma congolense clone IL2895. Infection rates in tsetse varied from 9 to 31% when fed on cattle, and from 2 to 59% when fed on waterbuck. In waterbuck, infections were often detected through the development of parasites in tsetse at times when parasitaemia could not be detected through microscopic examination of blood. Male and female, and 1- and 2-day-old flies were equally susceptible to infection on both hosts. Infection in tsetse was associated with a 14% absolute reduction in survival during the …

Pathogenicity Of Tsetse-Transmitted Trypanosoma Congolense For Waterbuck (Kobus Defassa) And Boran Cattle (Bos Indicus), R. O. Olubayo, S. Mihok, D. F. Wesonga, E. R.M. Mbwabi

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Five waterbuck (Kobus defassa) and four Boran cattle (Bos indicus) were infected with Trypanosoma congolense IL2895 using Glossina morsitans morsitans. At the same time, two waterbuck and two cattle were inoculated intravenously with bloodstream forms. With both methods of challenge, cattle had short prepatent periods followed by a continuous high parasitaemia. All cattle became severely anaemic and had to be treated with trypanocidal drugs to prevent death. In contrast, tsetse and intravenous challenge of waterbuck resulted in a long prepatent period, followed by brief, intermittent levels of low parasitaemia, and eventual selfcure. Waterbuck did not become anaemic, even during short …

Structural Studies On The Major Milk Gland Protein Of The Tsetse Fly, Glossina Morsitans Morsitans, Ellie O. Osir, Michael Kotengo, Mohammed F.B. Chaudhury, Leonard H. Otieno

All Peer-Reviewed Publications

1. 1. The major protein in the milk gland secretions of the tsetse fly, Glossina morsitans morsitans, was isolated by a combination of gel permeation chromatography and crystallization. 2. 2. It has a native Mr ∼47,000 and is composed of two identical polypeptide chains (Mr ∼21,000) as determined by chemical cross-linking studies. The protein has no covalently-bound carbohydrates or lipids. Amino acid analysis of the protein revealed relatively high amounts of the aromatic amino acids, tyrosine (9.1 mol.%) and phenylalanine (8.5 mol.%). Immunoblotting experiments using antiserum against the protein revealed no cross-reactivity with any other milk proteins. 3. 3. Quantitation …

Hexapod Herald - Vol. 1, No. 24, December 20, 1990

Hexapod Herald and Other Entomology Department Newsletters

National ESA meeting

Grants

Grant information

Congratulations

Publications

Department travelers

Miscellaneous

Calendar of events

Nebline, December 1990

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

Volume 4, No. 1-4 – December 1990

Insecta Mundi

Cover and Announcements

Hexapod Herald - Vol. 1, No. 23, November 16, 1990

Hexapod Herald and Other Entomology Department Newsletters

Bruner Club

Congratulations

Grants

Deadline

National ESA meeting

Faculty

Publications

Calendar of events

Miscellaneous

Nebline, November 1990

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. 1, No. 22, October 26, 1990

Hexapod Herald and Other Entomology Department Newsletters

Miscellaneous

Graduate students

Grants

Publications

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Hexapod Herald - Vol. 1, No. 21, October 12, 1990

Hexapod Herald and Other Entomology Department Newsletters

Miscellaneous

Grants

Graduate studentsPublications

Department travelers

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Nebline, October 1990

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

Insecticide Toxicity, Synergism, And Resistance In The German Cockroach (Dictyoptera: Blattellidae), Jeffrey G. Scott, Donald C. Cochran, Blair Siegfried

Department of Entomology: Faculty Publications

The toxicity of, synergism of, and resistance to insecticides in four strains of German cockroach, Blattella germanica (L.), were investigated. Toxicity of nine insecticides by topical application to the susceptible strain varied >2,000-fold, with deltamethrin (LD₅₀ = 0.004 μg per cockroach) and malathion (LD₅₀ = 8.4 μg per cockroach) being the most and least toxic, respectively. Resistance to pyrethrins (9.5-fold) in the Kenly strain was unaffected by the synergists piperonyl butoxide (PBO) or S,S,S-tributylphosphorotrithioate( DEE), suggesting that metabolism is not involved in this case. Malathion resistance in the Rutgers strain was suppressible with PBO, implicating oxidative metabolism as …

Hexapod Herald - Vol. 1, No. 20, September 28, 1990

Hexapod Herald and Other Entomology Department Newsletters

Miscellaneous

Grants

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Publications

Wanted: Input for upcoming newsletters

Classification Of The Apidae (Hymenoptera), Charles D. Michener

Mi

No abstract provided.

Hexapod Herald - Vol. 1, No. 17, September 14, 1990

Hexapod Herald and Other Entomology Department Newsletters

Miscellaneous

Grants

Deadlines

Graduate students

Calendar of events

Departmental travelers

Nebline, September 1990

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. 1, No. 16, August 31, 1990

Hexapod Herald and Other Entomology Department Newsletters

Miscellaneous

ESA Newsletter

Attention faculty

Room 214

Grants

Gamma Sigma Delta

Teaching faculty

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Hexapod Herald - Vol. 1, No. 15, August 8, 1990

Hexapod Herald and Other Entomology Department Newsletters

Miscellaneous

Grants

Alumi news

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Graduate students

Visitors

Pesticide Use On Crops In Nebraska - 1987, Maurice Baker, Nancy Peterson, Shripat T. Kamble

Nebraska Agricultural Experiment Station: Historical Research Bulletins

This is the third and most comprehensive study of pesticide use on crops in Nebraska. The first was completed in 1978 and the second one in 1982. The first study indicated that approximately 25 million pounds (11.34 million kg) of active ingredients were used on the major crops in Nebraska. This increased to approximately 30.2 million pounds (13.7 million kg) in 1982. The USDA requires accurate information to meet their responsibilities. Thus, this survey was undertaken to determine: 1) the use of pesticides on crops, pasture and rangeland and 2) to identify pest management practices.

Nebline, August 1990

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

Special Lancaster County Fair Insert

The Mayfly Newsletter, Peter M. Grant

The Mayfly Newsletter

The Mayfly Newsletter is the official newsletter of the Permanent Committee of the International Conferences on Ephemeroptera.

Hexapod Herald - Vol. 1, No. 14, July 17, 1990

Hexapod Herald and Other Entomology Department Newsletters

Grants

Awards

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Traveling out of the department

Campus wide expovision

Calendar of events

New projects