Abstract
Abstract Tobacco was transplanted at the Research and Education Center, Princeton, KY, on 30 May. All tobacco was produced using standard agronomic practices, including topping on 7 Aug, harvest on 19 Sept, housing, firing, stripping, and grading. Plots were 3 rows wide by 25 ft long. Adjacent plots were separated by single untreated guard rows. Foliar application of insecticides was made to the center row using a Co2 powered back pack sprayer fitted with 3, 70° hollow cone nozzles/row with one nozzle directly over the row and with 8 inch drops (aimed 135° from vertical) on either side of the row. Treatments were applied in 29 gal/acre at 42 psi. Aphid ratings were made from 5 consecutive plants in the center of each plot, using the following rating scale. 0°no aphids present, 1°very light, 1 aphid to small colonies, 2°several colonies but not widespread, 3°general, widespread colonies, 4°extremely heavy, on all plant parts. Application of Orthene 75 SP was applied in the transplant water, by foliar application or by a combination. Thiodan 3EC was applied by foliar application. The topping time spray was made on 8 Aug. Schedule sprays were made on 26 Jul, 8 Aug, and 24 Aug. Thus, the schedule sprays included the topping time spray. Treatments were arranged in a randomized complete block design.
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