caa a22 4500 397570783 CHVBK 20180308164840.0 cr unu---uuuuu 161202e19960401xx s 000 0 eng 10.1093/ee/25.2.401 doi (NATIONALLICENCE)oxford-10.1093/ee/25.2.401 Skinner R. Howard Western Cotton Research Laboratory, USDA-ARS, Phoenix, AZ 85040 Response of Bemisia argentifolii (Homoptera: Aleyrodidae) to Water and Nutrient Stressed Cotton [Elektronische Daten] [R. Howard Skinner] Water stress usually increases plant susceptibility to the whitefly Bemisia argentifolii Bellows & Perring, whereas nutrient stress generally reduces the level of whitefly infestation. This study examined the effect of water and phosphorus stress on plant physiological traits to help explain the response of B. argentifolii to host plant conditions. Host preference was determined by examining oviposition rates on water- and phosphorus-stressed cotton, Gossypium hirsutum L., in the greenhouse, and by studying the effect of irrigation frequency on oviposition and B. argentifolii developmental rate in the field. In the greenhouse, oviposition was reduced 9% (P = 0.09) by water stress but was not affected by phosphorus deficiency. In the field, oviposition was 6 times greater in the biweekly compared with weekly irrigated plots. In no choice experiments, however, oviposition was unaffected by irrigation frequency, with the exception of lower leaves in the canopy which had been previously damaged by B. argentifolii, where oviposition was reduced 63% in the biweekly plots where damage was the greatest. Irrigation frequency had no effect on developmental rate from egg to adult. In the greenhouse, oviposition was affected most by leaf position on the plant, and was >2 times as great on tile youngest compared with the oldest leaf on a 4-leaf seedling. Multiple regression analysis suggested that oviposition was not independently affected by transpiration rate or leaf temperature. Leaf water potential, sucrose concentration, and amino acid concentration made the greatest contribution to B. argentifolii host selection, with oviposition being greatest on leaves with low water potential and low bulk leaf sucrose and amino acid concentrations. © 1996 Entomological Society of America Population Ecology nationallicence Bemisia argentifolii nationallicence leaf position nationallicence water potential nationallicence sucrose concentration nationallicence amino acids nationallicence cotton nationallicence Environmental Entomology Oxford University Press 25/2(1996-04-01), 401-406 0046-225X 25:2<401 1996 25 ee https://doi.org/10.1093/ee/25.2.401 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1093/ee/25.2.401 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Skinner R. Howard Western Cotton Research Laboratory, USDA-ARS, Phoenix, AZ 85040 NATIONALLICENCE 773 0- Environmental Entomology Oxford University Press 25/2(1996-04-01), 401-406 0046-225X 25:2<401 1996 25 ee Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford