Abstract
Response by sweet corn, Zea mays , to fall armyworm feeding during three vegetative periods was studied three times during the 1988-1989 growing season near Belle Glade, Fla. Feeding damage by fall armyworm during the early and midwhorl stages (V1-V9) Significantly reduced plant height, stalk diameter, leaf area, and fresh and dry weight of aboveground portions of sweet corn plants. Protecting plants from fall armyworm damage during the late whorl stage (V9-Rl) resulted in higher yields and reduced percentages of ears damaged by insects. Protecting the plants from fall armyworm damage during the midwhorl stage (V6-V9) was not as important as during the late whorl stage but was more important than during early whorl stage (V1-V6). Fall armyworm densities as low as 0.2-0.8 larvae per plant during the late whorl stage may be sufficient to reduce yields of U.S. No.1 ears by 5-20%.
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