A field experiment was conducted at the UF/IFAS Everglades Researchand Education Center in Belle Glade, FL, to evaluate the efficacy offoliar insecticides for management of aphids infesting lettuce. Fourinsecticide treatments and a nontreated check were evaluated in anRCBD with four blocks and one replicate per block. Romaine lettuce‘Manatee’ was planted on 6 Feb on raised beds (36-inch center) withtwo rows 1 ft apart on each bed. Plots were 4 beds wide and 24 ftlong. All insecticide treatments were initiated when aphid infestationlevels attained 3.9 GPA and 1.8 Uroleucon pseudambrosiae perplant as determined by observation of 25 randomly selected plantsper block. Torac and Sivanto Prime treatments were applied fourtimes (Mar 10, Mar 21, Mar 28, Apr 5) whereas the Movento treatmentwas applied twice (Mar 10, Mar 21). Insecticides were appliedusing a CO2-pressurized backpack sprayer calibrated to deliver 10gpa at 30 psi. A boom equipped with four Teejet TP8001VS spaced18 inches apart was used (broadcast application). Belt at 2.0 fl oz/acre was applied to the experimental field with commercial equipmenton Mar 8 for early season lepidopteran pest management. Inaddition, a weekly application of Manzate Pro-Stick at 2.0 lb/acretank-mixed with Nutri-Phite Magnum at 4.0 pt/acre rotated withOrondis Ultra at 8.0 fl oz/acre was made to control foliar diseasesstarting on Mar 16.
展开▼
