Proper timing allows growers to reduce the number of insecticide applications which effectively delays resistance development. Dip tests or spray tests are useful to determine if the effectiveness of old insecticides has increased and to detect early signs of reduced sensitivity to Admire. These tests should be done in the spring, after CPB have fed on potato foliage and before populations reach Economic Thresholds . CPB is a community problem. In many areas of Ontario, potato fields are close to each other.
Beetles fly or walk from one field to another, and populations mix.
Thus, the control practices of one grower will have and impact on the CPB management practices of other growers. Plants no taller than 6 inches. If the location of the overwintering site is known, the direction of the rows should be perpendicular to the movement of the beetles into the field. This will allow you to apply border treatments of insecticides and will facilitate the use of the propane flamer and plastic lined trenches. Hartland Machine Limited sells 4-Row propane flamers.