Abstract
Abstract Commercially grown tobacco was transplanted 13 May in Pender County, N.C., and 27 Apr in Sampson County. Because natural infestations were very light, 20 undamaged plants/plot were tagged and artificially infested with budworms from a culture maintained at North Carolina State University. A single 1-d-old larva was transferred from artificial diet to the bud of tagged plants using a camel's hair brush and allowed 24 h (Pender) and 96 h (Sampson) to become established before treatment. Treatments were arranged in a randomized complete block design with 4 replicates. Plots were 0.02 acres, 4 rows, separated laterally by a vacant row and on each end by 10-16-ft alleys. Insecticides were applied with a C02-pressurized backpack sprayer delivering 30 gal/acre through a single TG-3 nozzle (Pender, 24 Jun) or 16 gal/acre through a single TG-2 nozzle (Sampson, 13 Jun) at 60 psi. Tagged plants were examined for budworms at 3 and 13 DAT in Pender and at 4 and 10 DAT in Sampson. On the second date in each location, budworm damage was rated on all tagged plants. After final harvest and curing, tobacco was weighed and graded with the assistance of a government grader. Data were subjected to ANOVA. For analysis, budworm infestation was expressed as the proportion of plants infested and yield as lb/plot. In the table, infestation is presented as the percentage of plants infested.
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