Assessment of irrigation-related insecticide application methods for control of lepidopteran insect pests of sweet corn
Chandler, L.D. | Sumner, H.R. | Mullinix, B.G.
Application of insecticides through center-pivot irrigation systems during the spring and summer growing seasons of 1990 and 1991 was as efficient in controlling corn earworm, Helicoverpa zea (Boddie), and fall armyworm, Spodoptera frugiperda (J.E. Smith), larvae in fresh-market corn, Zea mays (L.), as was the application of insecticides with a high-clearance sprayer. Hollow cone and rotating irrigation sprinklers applied insecticides uniformly along the length of the pivot arm, resulting in less than or equal to 3% corn ear damage in all growing seasons. Insect damage to ears following use of insecticides applied with a piggyback application system and a high-clearance sprayer was similar and generally above the acceptable range (less than or equal to 3% damaged ears) for fresh-market use in most growing seasons. Insecticides applied with the piggyback system failed to provide uniform insect control along the irrigation pivot arm in both 1990 and 1991.
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