Submitted to: Sweetpotato Whitefly Progress Review Proceedings
Publication Type: Proceedings
Publication Acceptance Date: April 1, 2002
Publication Date: June 1, 2002
Technical Abstract: Comparisons of honeydew production by sweetpotato whitefly (SPW), Bemisia tabaci (Gennadius) Strain B while feeding on water-stressed or non-water-stressed cotton showed that more honeydew sugars were produced on non water-stressed leaves of cotton plants (four days after irrigation) compared to those feeding on leaves of cotton plants 7 or 13 days after irrigation (water stress). Leaf water potentials, as a measure of water stress, decreased with increasing numbers of days following irrigations. Leaf water potentials of furrow irrigated cotton and furrow irrigated plus supplementary drip irrigated cotton (1 h per day) showed the same decreasing leaf water potential patterns. The decreases, however, were less in furrow irrigated plus supplementary drip irrigation compared with furrow irrigation alone. SPW feeding on plants in the field with furrow plus supplementary drip irrigation and in the greenhouse on non-stressed cotton plants produced more micrograms of honeydew sugars per gram of honeydew compared to SPW feeding on plants with furrow irrigation alone in the field and on water-stressed plants in the greenhouse.