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Potatoes were planted on 15 Apr at the Eastern Shore Agricultural Experiment Station, Painter, VA. Each plot consisted of a double 25 ft row, bordered on each side by an untreated guard row, and replicated 4 times in a randomized complete block design. Plant spacing was 10 inches with 36 inches between rows. Treatments were applied with a propane compressed gas backpack sprayer using three hollow cone (D4-45) nozzles/row and delivering 60 gal water/acre at 40 psi. Peak CPB egg hatch occurred on 17 May. Sprays were applied on 21, 31 May, 7 and 15 Jun. Cygon 400 (.25 lb Al/acre) was added to all treatments on 7 and 15 Jun to control potato leafhoppers. On 21 Jun, the entire test was sprayed out with Vydate L (2 qt product/acre) in order to prevent complete defoliation by emerging, first generation CPB adults. Rainfall from Mar until the second week in Jun resulted in a delayed planting date and difficulty in applying the critical, early season sprays. The delayed planting date and the drought from mid-Jun until harvest resulted in lower than average yields. Evaluation criteria consisted of weekly counts of all CPB life stages present on 10 randomly chosen stems/ plot, defoliation ratings on 11 and 23 Jun, and yield data.

Use of Bacillus Thuringiensis and Kryocide to Control Colorado Potato Beetle (CPB) in Potatoes, 1993