Entomology Commons^™

Insect Immune Response To Bacterial Infection Is Mediated By Eicosanoids, David W. Stanley-Samuelson, Ellen Jensen, Kenneth Nickerson, Kristina C. Tiebel, Clyde Ogg, Ralph W. Howard

Department of Entomology: Faculty Publications

Inhibition of eicosanoid formation in larvae of the tobacco hornworm Manduca sexta, using specific inhibitors of phospholipase A₂, cyclooxygenase, and lipoxygenase, severely weakened the ability of larvae to clear the bacterium Serratia marcescens from their hemolymph. The reduced capability to remove bacteria is associated with increased mortality due to these bacteria. There is a dose-dependent relationship between the phospholipase A₂ inhibitor dexamethasone and both the reduced bacterial clearance and increased larval mortality. The dexamethasone effects on larval survival were reversed by treatment with arachidonic acid. Maleic acid, a nonspecific antioxidant, did not interfere with the insects' …

Hexapod Herald - Vol. 2, No. 1, January 14, 1991

Hexapod Herald and Other Entomology Department Newsletters

Grants

Spring 1991 semester

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Nebline, January 1991

NEBLINE Newsletter Archive from Nebraska Extension in Lancaster County

Ag Update: Agricultural News & Events

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On-the-Grow: Horticulture News & Recommendations

The Cloverline: 4-H News and Events

Extension Calendar

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Preserved Grasshopper Fauna Of Knife Point Glacier, Fremont County, Wyoming, U.S.A., Jeffrey A. Lockwood, Craig D. Thompson, Larry D. Debrey, Charles M. Love, Richard A Nunamaker, Robert E. Pfadt

Entomology Papers from Other Sources

In 1987 and 1988, samples of preserved insects were extracted from the ice of Knife Point Glacier, Fremont County, Wyoming. The glacier lies at an altitude of 3500 m a.s.l. in the Shoshone National Forest, Wind River Range, and is known to contain preserved insects. Although the glacier has undergone extensive recession in the last 50 yr, some insect deposits are still embedded at 20 to 25 cm below the surface and perhaps much deeper. The frozen deposits appear to consist entirely of grasshoppers. A few, virtually intact, specimens and body parts were in a state of preservation that allowed …

Potential Of Starch Encapsulated Semiochemical-Insecticide Formulations For Adult Corn Rootworm (Coleoptera: Chrysomelidae) Control, Thomas J. Weissling, Lance J. Meinke

Department of Entomology: Faculty Publications

Field and laboratory experiments were conducted from 1987 through 1989 to determine if plant-derived semiochemicals and carbamate insecticides, encapsulated in starch-borate (SBM) and pregelatinized-starch (PGM) matrices, could be used to attract and kill corn rootworm (Diabrotica spp.) beetles. D. virgifera virgifera LeConte adults were concentrated in plots within a corn (Zea mays L.) field, following application of SBM granules formulated with semiochemicals and carbaryl. However, resulting mortality was low even though beetles were observed feeding on the granules. Low mortality levels appear to have been caused by a loss of carbaryl during the formulation process. Laboratory assay results indicated …

Mechanisms Of Hybrid Sunflower Resistance To The Sunflower Midge (Diptera: Cecidomyiidae), Marc D. Anderson, Gary J. Brewer

Department of Entomology: Faculty Publications

A study was conducted to identify mechanisms of resistance in sunflower to the sunflower midge, Contarinia schulzi Gagné. Infestation ratings, larval counts, and damage ratings were used to quantify midge resistance in seven sunflower hybrids grown at three locations. Six of the seven hybrids possessed midge resistance. Each hybrid was further categorized with respect to infestation resistance, antibiosis, and tolerance. Two bud characteristics, percent open and size, were examined for their contribution to infestation resistance. The percentage of time that buds of each hybrid were open was negatively correlated with infestation (indicating a preference for the open characteristic). Infestations were …

Oviposition And Larval Bionomics Of Two Weevils (Coleoptera: Curculionidae) On Sunflower, Gary J. Brewer

Department of Entomology: Faculty Publications

Use of cultivated sunflower (Helianthus annum L.) as a host by two species of seed weevils, Smicronyx fulvus LeConte, the red sunflower seed weevil, and S. sordidus LeConte, the gray sunflower seed weevil, was compared using dissection of achenes from naturally and artificially infested plants. The gray seed weevil oviposits on the tips of unopened sunflower florets before anthesis. Larvae migrate through the corolla tube, penetrate the developing achene, and begin extensive feeding at the achene base. Achenes infested by the gray sunflower seed weevil are enlarged, lack an embryo, and appear to be a type of gall. The …

Gelled Diet For Screwworm (Diptera: Calliphoridae) Mass Production, David B. Taylor, Jimmy C. Bruce, Rene Garcia

Department of Entomology: Faculty Publications

A rearing system based on a diet gelled with Water-Lock G400, a synthetic superabsorbent (poly(2-propenamide-co-2-propenoic acid, sodium salt))( WL), was compared with the standard rearing system (liquid diet suspended in acetate fibers) for the mass production of screwworms, Cochlomyia hominivorax (Coquerel). The WL rearing system yielded 2% heavier pupae, 32% higher egg to pupa survival, and required 54% less diet and 88% less labor than the standard rearing system. Other advantages of the WL system include reduced susceptibility to suboptimal environmental conditions and labor practices, and characteristics conducive to centralization and mechanization of rearing procedures.

Effect Of Starch-Based Corn Rootworm (Coleoptera: Chrysomelidae) Baits On Selected Nontarget Insect Species: Influence Of Semiochemical Composition, Thomas J. Weissling, Lance J. Meinke, Kandy A. Lytle

Department of Entomology: Faculty Publications

Various starch-encapsulated semiochemical-insecticide formulations, developed for potential use in adult corn rootworm (Diabrotica spp.) management programs, were evaluated in the laboratory and field for effectiveness on corn rootworm beetles: a carabid, Harpalus pennsylvanicus DeGeer; and a coccinellid, Coleomegilla maculata lengi Timberlake. Carbaryl was formulated in pregelatinized starch matrices along with Diabroticaspecific semiochemicals. The specific combination of feeding-gustatory stimulants encapsulated within or coating the outside of starch granules significantly influenced effectiveness. Allstarch formulations containing feeding-gustatory stimulants effectively killed Diabrotica virgifera virgifera LeConte adults in laboratory and field bioassays. However, H. pennsylvanicus and C. m. lengi mortality was greatly reduced when …

The Fatty Acid Compositions Of Phospholipids And Triacylglycerols From Two Chinch Bug Species Blissus Leucopterus Leucopterus And B. Iowensis (Insecta: Hemiptera; Lygaeidae) Are Similar To The Characteristic Dipteran Pattern, Barbara P. Spike, Robert J. Wright, Stephen D. Danielson, David W. Stanley-Samuelson

Department of Entomology: Faculty Publications

1. The fatty acid compositions of phospholipids and triacylglycerols prepared from whole chinch bugs Blissus leucopterus leucopterus and B. iowensis were analyzed.
2. The fatty acid profiles from these insects are different from those from all other insect groups so analyzed, except most Diptera.
3. The major components include 16:0 and 18:0, high proportions of 16:1 and 18:1 and low proportions of polyunsaturated fatty acids.
4. The fatty acid profiles were similar for several categories from both species of chinch bugs, including adult males and females, prediapausing and diapausing adults, and nymphs.

Body-Size And Wing-Length Variation Among Selected Grasshoppers (Orthoptera: Acrididae) From Nebraska's Sandhills Grasslands, Sarah B. Gaines

Transactions of the Nebraska Academy of Sciences and Affiliated Societies

Morphological variation in six grasshopper species is examined. Statistics describing collections (adult males and females) made during July 1986 and July and August 1987 are given. Five of the species are characterized by long wings, and the sixth is wing-length dimorphic. Additional collections at several western Nebraska grassland sites were used to examine relationships between nymph population density and wing-length frequencies in adults. Coefficients of variation were also calculated to facilitate designs of future experiments.

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

Hexapod Herald and Other Entomology Department Newsletters

National ESA meeting

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Nebline, December 1990

NEBLINE Newsletter Archive from Nebraska Extension in Lancaster County

Ag Update: Agricultural News & Events

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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

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Nebline, November 1990

NEBLINE Newsletter Archive from Nebraska Extension in Lancaster County

Ag Update: Agricultural News & Events

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Hexapod Herald - Vol. 1, No. 22, October 26, 1990

Hexapod Herald and Other Entomology Department Newsletters

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

Hexapod Herald and Other Entomology Department Newsletters

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Nebline, October 1990

NEBLINE Newsletter Archive from Nebraska Extension in Lancaster County

Ag Update: Agricultural News & Events

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The Cloverline: 4-H News and Events

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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

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Wanted: Input for upcoming newsletters

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

Hexapod Herald and Other Entomology Department Newsletters

Miscellaneous

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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

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

Hexapod Herald and Other Entomology Department Newsletters

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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

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Special Lancaster County Fair Insert

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

Hexapod Herald and Other Entomology Department Newsletters

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Hexapod Herald - Vol. 1, No. 13, July 2, 1990

Hexapod Herald and Other Entomology Department Newsletters

Miscellaneous

New or revised projects

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Entomological Scoiety of America, North Central Branch News

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Nebline, July 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