Department of Entomology
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- Pesticide Formulation - Dust(Virginia Tech Pesticide Programs, 02/01/2022)Dust formulation placed on a dish.
- Postemergence growth of the ovarian follicles of Aedes aegyptiHagedorn, H. H.; Turner, Sarah; Hagedorn, E. A.; Pontecorvo, David; Greenbaum, Paula; Wheelock, Geofrey; Flanagan, T. R. (1977)Growth of the ultimate follicle to the resting stage in Aedes aegypti is linear and reaches maximum development about 6Ohr after emergence. Decapitations and ligations at various times after emergence indicate that growth of the follicles is under the control of factors from the head and thorax. Release of head factor occurs within one day after emergence and is relatively sudden. The thoracic factor is released gradually over a 2 to 3 day period. Near normal growth of follicles in isolated abdomens after topical application of juvenile hormone (JH) indicates that the thoracic factor is JH from the corpora allata and demonstrates the feasibility of using this system as a JH assay. When ecdysone was injected simultaneously with JH the follicles failed to grow.
- Cucumber pollen germination and tube elongation inhibited or reduced by pesticides and adjuvantsGentile, A. G.; Vaughan, A. W.; Pfeiffer, Douglas G. (1978)
- Coleoptera of poultry manure in caged-layer houses in North CarolinaPfeiffer, Douglas G. (1980)
- Insect Identification Laboratory Annual Report 1981Hilburn, Daniel J.; Allen, William A. (Virginia Tech, 1981)This report summarizes the activity of the Insect Identification Laboratory at Virginia Tech for 1981.
- Insect Identification Laboratory Annual Report 1982Hilburn, Daniel J.; Allen, William A. (Virginia Tech, 1982)This report summarizes the activity of the Insect Identification Laboratory at Virginia Tech for 1982.
- Insect Identification Laboratory Annual Report 1983Hilburn, Daniel J. (Virginia Tech, 1983)This report summarizes the activity of the Insect Identification Laboratory at Virginia Tech for 1983.
- Effect of tree fertilization on numbers and development of pear psylla (Homoptera: Psyllidae), and on fruit damagePfeiffer, Douglas G.; Burts, E. C. (1983)
- Effect of tree fertilization on protein and free amino acid content and feeding rate of pear psylla (Homoptera: Psyllidae)Pfeiffer, Douglas G.; Burts, E. C. (1984)
- Insect Identification Laboratory Annual Report 1984Hilburn, Daniel J.; Ravlin, F. William; Weidhaas, John A., Jr. (Virginia Tech, 1984)This report summarizes the activity of the Insect Identification Laboratory at Virginia Tech for 1984.
- Insect Identification Laboratory Annual Report 1985Hilburn, Daniel J.; Ravlin, F. William; Weidhaas, John A., Jr. (Virginia Tech, 1985)This report summarizes the activity of the Insect Identification Laboratory at Virginia Tech for 1985.
- Effects of field applications of paraquat on densities of Panonychus ulmi (Koch) and Neoseiulus fallacis (Garman)Pfeiffer, Douglas G. (1986)Neoseiulus fallacis (Garman) is the most important acarine predator of the European red mite, Panonychus ulmi (Koch), in sprayed apple orchards in the eastern United States [Poe, S. L., and W. R. Enns. 1969. Predaceous mites (Acarina: Phytoseiidae) associated with Missouri orchards. Trans. Missouri Acad. Sci. 3: 69-82; Berkett, L. P., and H. Y. Forsythe. 1980. Predaceous mites (Acari) associated with apple foliage in Maine. Can. Entomol. 112: 497-502]. Populations of this predator are often present only at very low densities in Virginia orchards, however. The herbicide paraquat has been shown to be toxic to N. fallacis using slide-dip bioassays [Rock, G. C., and D. R. Yeargan. 1973. Toxicity of apple orchard herbicides and growth-regulating chcmicnls to Neoseiulus fallacis and twospotted spider mite. J. Econ. Entomol. 66: 1342-1343; Hislop, R. G., and R. J. Prokopy. 1981 . Integrated management of phytophagous mites in Massachusetts (U.S.A.) apple orchards. 2. Influence of pesticides on the predator Amblyseius fallacis (Acarina: Phytoseiidae) under laboratory field conditions. Protect. Ecol. 3: 157-1721. Paraquat is commonly applied in Virginia apple orchards in early spring while N. fallacis is still in its overwintering site in the orchard ground cover. The purpose of this study was to determine if field applications of paraquat affect densities of P. ulmi and its predator, N. fallacis, in the tree canopy. Slide-dip bioassay data, while very useful for comparing toxicity from topical applications of pesticides, are highly artificial and do not reflect other factors in mortality (contact with dried residues, behavioral responses, habitat modification). Other methods should be employed to complement slide-dip data (Dennehey, T. J., J. Granett, and T. F. Leigh. 1983. Relevance of slide-dip and residual bioassay comparisons to detection of resistance in spider mites. J. Econ. Entomol. 76: 1225-1230).
- Relative susceptibility to slide-dip application of cyhexatin in three populations of Panonychus ulmi (Koch) in Virginia apple orchardsPfeiffer, Douglas G.; Pfeiffer, S. W. (1986)
- Insect Identification Laboratory Annual Report 1986Day, Eric R.; Ravlin, F. William; Weidhaas, John A., Jr.; Rutherford, Susan L. (Virginia Tech, 1986)This report summarizes the activity of the Insect Identification Laboratory at Virginia Tech for 1986.
- Disruption of olfactory communication in oriental fruit moth and lesser appleworm in a Virginia peach orchardPfeiffer, Douglas G.; Killian, J. C. (1988)
- Insect Identification Laboratory Annual Report 1987Day, Eric R.; Ravlin, F. William; Weidhaas, John A., Jr.; Rutherford, Susan L. (Virginia Tech, 1988)This report summarizes the activity of the Insect Identification Laboratory at Virginia Tech for 1987.
- Insect Identification Laboratory Annual Report 1988Day, Eric R.; Ravlin, F. William; Weidhaas, John A., Jr.; Rutherford, Susan L. (Virginia Tech, 1989)This report summarizes the activity of the Insect Identification Laboratory at Virginia Tech for 1988.
- Insect Identification Laboratory Annual Report 1989Day, Eric R.; Ravlin, F. William; Weidhaas, John A., Jr.; Rutherford, Susan L. (Virginia Tech, 1990)This report summarizes the activity of the Insect Identification Laboratory at Virginia Tech for 1989.
- Insect Identification Laboratory Annual Report 1990Day, Eric R.; Ravlin, F. William; Rutherford, Susan L. (Virginia Cooperative Extension, 1991)This report summarizes the activity of the Insect Identification Laboratory at Virginia Tech for 1990.
- Evaluation of methods to protect poultry house insulation from infestations by lesser mealworm (Coleoptera: Tenebrionidae)Despins, Joseph L.; Turner, E. Craig Jr.; Pfeiffer, Douglas G. (1991)Insecticide sprays Bnd paint barriers Applied to the surface of extruded polystyrene, and different types of insulation, were evaluated for prevention of lesser melllwonn, Alphitobius diapcn"nlls (Panzer), infestations. In a lahoratOly study, tetrachlOlvinphos 50 ¥lP and pirimiphosmethyl 7E on extruded polystyrene produced> 90% mortality in larval and adult lesser mealwonn populations 71 wk after application. These insecticide spray treatments, however, were not effective under conditions found in the manure pit of a high rise cage layer house. Our field study showed that Styrofoam SS"" and Ethafoarn 220''', were resistant. to lesser mealwonn infestations. Super IQ'" paint., a latex paint impregnated with chlorpyrifos, was also effective in protecting extruded polystyrene from infestations under field conditions.