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Full-Text Articles in Life Sciences
Response Of Screwworms (Diptera: Calliphoridae) To Changes In The Concentration Of Blood, Egg, And Milk In The Larval Diet, David B. Taylor
Response Of Screwworms (Diptera: Calliphoridae) To Changes In The Concentration Of Blood, Egg, And Milk In The Larval Diet, David B. Taylor
Department of Entomology: Faculty Publications
Larvae of screwworm, Cochliomyia hominivorax (Coquerel), were reared on diets with varying concentrations of whole dried bovine blood, whole dried egg, and nonfat dried milk. Pupal weight, egg to pupal survival, adult emergence, sex ratio, fecundity, and fertility were significantly affected by one or more of the dietary components. Curvilinear models for the effect of dietary component concentration on life history parameters were derived by multiple regression. Most models resulted in bell-shaped curves that were used to calculate optimal diet component concentrations. Biomass, survival, emergence, and fecundity were maximized at 6% blood, 5% egg, and 1.3% milk.
Comparison Of Two Gelling Agents For Screwworm (Diptera: Calliphoridae) Larval Diets, David B. Taylor
Comparison Of Two Gelling Agents For Screwworm (Diptera: Calliphoridae) Larval Diets, David B. Taylor
Department of Entomology: Faculty Publications
A sodium polyacrylamide polyacrylate gelling agent, Water-Lock G-400, and a galactan polysaccharide agent, carrageenan, were compared for solidifying larval diets of the screwworm, Cochliomyia hominivorax (Coquerel). Water-Lock diet produced larger pupae with less larval mortality than did carrageenan diet. Pupae from larvae reared on the Water-Lock diet exhibited higher emergence and produced adults with higher fecundity. Water-Lock diet also produced larger larvae at 56 h after oviposition. Densities in excess of 300 mg of eggs (16,200 eggs) per liter of Water-Lock gelled diet did not increase larval yield but did reduce larval weight and survival.
Variation In Chromosome Length Among Five Biotypes Of The Greenbug (Homoptera: Aphididae), Z. B. Mayo, K. J. Starks, D. J. Banks, R. A. Veal
Variation In Chromosome Length Among Five Biotypes Of The Greenbug (Homoptera: Aphididae), Z. B. Mayo, K. J. Starks, D. J. Banks, R. A. Veal
Department of Entomology: Faculty Publications
Chromosome-length measurements from five greenbug, Schizaphis graminum (Rondani), biotypes (B, C, E, F, and Maryland) were compared by discriminant analyses procedures. There were highly significant (P = 0.0001) differences in total lengths of chromosome sets among biotypes. In individual paired comparisons, where each biotype was compared with only one other biotype at a time, chromosome measurements correctly classified aphids to their respective biotype in 45-85% of the cases. Degree of correct classification was dependent on the two biotypes being compared and the discriminant function used in the analysis. Results indicate that there are two groups of biotypes that can be …
Patterns Of Resource Use By A Drosophilid (Diptera) Leaf Miner On A Native Crucifer, S. K. Collinge, Svata M. Louda
Patterns Of Resource Use By A Drosophilid (Diptera) Leaf Miner On A Native Crucifer, S. K. Collinge, Svata M. Louda
School of Biological Sciences: Faculty Publications
Distribution and damage of Scaptomyza nigrita Wheeler on its host (bittercress, Cardamine cordifolia A. Gray), a native perennial crucifer, were examined over two growing seasons in relation to leaf position. Concentrations of defensive compounds (glucosinolates) and of nutritive compounds (total nitrogen, free amino acids, soluble carbohydrates) were also examined. The fly-host plant relationship was studied in sun and shade habitats at two sites. Oviposition and leaf-mining damage were concentrated on the lower central leaves of a stem in both habitats. These mature leaves have lower glucosinolate concentrations than new leaves. Adult densities and larval feeding damage were consistently and significantly …