Abstract
Abstract Nine treatments were evaluated for control of the tobacco aphid on burley tobacco at the Southwest Virginia Agricultural Experiment Station, Glade Spring, Va. Tobacco was transplanted on 1 Jun in plots 30 ft (16 plants) × 8 ft (2 rows). A randomized complete block design was utilized and treatments were replicated 4 times. Plots were separated by single untreated border rows and blocks were separated by vacant 5 ft alleys. Immediately after transplanting, 8 fl oz of Orthene transplant water solution (340 gal/acre) was applied to each plant in designated plots using a measuring cup. Foliar treatments were applied with a CO2-pressurized backpack sprayer delivering 24 gal/acre through 3, TX-lO hollow cone nozzles/row at 60 psi. Foliar treatments were applied on 17 Jul, except for one Orthene treatment which was applied on 1 Aug. When treatments were applied on 17 Jul, the weather conditions were hazy, wind calm and the temperature ranged from 75°80°F. There was no measurable rainfall for 2 DAT. Aphid infestations on the upper 4 leaves of 10 plants/plot were rated on a scale of 0-7, where 0 = 0 aphids; 1 = 1-10 aphids; 2 = 11-50 aphids; 3 = 51-100 aphids; 4 = 101-500 aphids; 5 = 500-1,000 aphids; 6 = 1,001-5,000 aphids and 7 = more than 5,000 aphids. Counts were made immediately before application of foliar treatments on 17 Jul, and at 7, 15, 23 and 30 DAT.
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