| Summary: | A field experiment was conducted to investigate the effect of infestation
levels of Ostrinia furnacalis larvae per plant on corn grain yield reductions, and to
determine economic injury levels (EIL) of O. furnacalis larvae and economic
threshold (ET) of egg masses at three corn growth stages (V10, R1, and R2). The
interaction between corn growth stage and number of larvae per plant on grain
yield was absent. Either corn growth stage or number of larvae per plant
significantly affected grain yield. Differences in yield between the uninfested and
highest infestation levels (six larvae per plant) in V10, R1, and R2 were 59.81
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