Insect Predators for Controlling Aphids on Potatoes. 6. Development of a Spray Technique for Applying Eggs in the Field1

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Abstract
A compressed-air sprayer was suitable for applying eggs of Coccinella septempunctata L., C. transversoguttata Faldermann, or Chrysopa spp. on blotting paper, cloth, soil. or potato plants. Without impairment of hatch, the coccinellid eggs were applied in a spray at a pressure of 0.9-2.3 kg/cm2, and des talked eggs of Shrysopa spp. at pressures up to 13.6 kg/cm2. Of several solutions tested, the best for suspending and applying the coccincllid eggs was one containing 0.125% agar; however, many of the eggs sprayed on foliage in the 0.125% agar solution were not found following rains. Presumably the eggs were washed to the potato stalks or to the soil beneath. This and other kinds of egg loss prevented adequate assessment of the hatch on potato foliage in the field. No hatching occurred when eggs of coccinellids were situated on the soil surface in row middles and exposed to direct sunlight, but satisfactory hatching did occur when the eggs were on the soil surface within the plant canopy or on the leaves long enough to complete their development.

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