Abstract
Abstract Tobacco was transplanted at the Research and Education Center, Princeton, KY, on 31 May. All tobacco was produced using standard agronomic practices, including topping, housing, firing, stripping and grading. Plots were 3 rows wide by 25 ft long. Adjacent plots were separated by single untreated guard rows. Foliar applications of insecticides were made to the center row using a CO2 powered, back pack sprayer fitted with 3, 70° hollow cone nozzles/row with 1 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 on 23 Jul, 6 and 26 Aug. 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 to small colonies; 2-several colonies but not widespread; 3-general wide spread colonies; 4-extremely heavy, on all plant parts. In Test 1, application of Orthene 75 SP or Thiodan 3 EC was made on none, 1, 2 or all 3 dates with the topping occurring on 31 Jul. In Test 2, topping was delayed until 9 Aug and only no treatment and the final 2 treatment dates were used. Test 1 contained 4 replicates; Test 2 3 replicates.
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