Abstract
Host-plant resistance to surviving 1st-brood larvae of Ostrinia nubilalis (Hubner) was studied by feeding the larvae fresh tissue of corn leaf from 3 corn inbred lines. The lines (WF9 = susceptible, Oh43 = resistant, CI.31A = highly resistant) were tested at midwhorl and late-whorl stages of plant development. Mortality was higher among larvae fed resistant tissue and higher among larvae fed tissue from the mid-whorl stage. The percentages of larval death were linearly related to concentrations of DIMBOA (2,4-dihydroxy-7-methoxy-2H-1,4-benzoxazin-3-(4H)-one) in the tissue. Insects fed resistant tissue developed slower, weighed less, mated less successfully, and produced fewer egg masses than those fed susceptible tissue, but viability and size of the egg masses were not affected. Thus, insects fed susceptible late-whorl tissue produced 60 offspring for each offspring produced by insects fed highly resistant mid-whorl tissue.
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