| Popis: |
Transplants were set 5 Mar, 15 inches apart on 8-inch-high beds of EauGallie fine sand covered with white polyethylene mulch. Each plot consisted of a single 15-ft row with rows on 5 ft centers. Treatments were replicated 4 times in a randomized complete block design and were applied with a 2.5 gal, handheld CO2-powered sprayer on 15, 24, 30 Apr, 6, 15, and 24 May. The sprayer was operated at 40 psi and 75 gal/acre using a single nozzle fitted with a D- 5 disk and #45 core. On 6 (after spraying), 7 and 8 May, the number of sweetpotato whitefly adults was estimated by counting the number dislodged from the upper foliage of five plants per plot. The foliage was shaken over a black aluminum pan with the bottom coated with a thin layer of vegetable oil. On 31 May, the number of leafmines was counted in a 1 minute search of selected treatments. Fruit were harvested on 20, 30 May, and 6 Jun and the number and weight of undamaged fruit and the number and weight of fruit damaged by noctuid larvae (primarily the southern armyworm), and stink bugs (primarily the southern green stink bug) were determined. |
