Rotenone to Control the Colorado Potato Beetle in White Potatoes, 1984

Potatoes were planted on 12 Apr, ’84, in a Sassafras sandy loam field. Plots were 20 ft long, 5 ft wide and replicated 4 times in a randomized complete block design; a guard row buffered each treated row. Treatments were applied with a self-propelled, high-clearance sprayer with 1 drop nozzle on each side of the row and 1 over the center calibrated to deliver 83 gal/acre at 200 psi. Treatments were applied on 19, 26, Jun, 3 and 12 Jul. Plant % defoliation was recorded on 28 Jun, 5, 9 and 16 Jul. Number of Colorado potato beetle (CPB) larvae per 5 hills were recorded on 28 Jun. Number of stems/10 hills damaged by European corn borers (ECB) were recorded on 16 Jul. Yields (cwt/A) were recorded on 31 Jul. Plots were irrigated when moisture was below normal.