| dc.description.abstract | Neonate (newly eclosed) larvae of the European corn borer, Ostrinia nubilasis Hubner, were studied in regard to their feeding responses on 9 different genotypes of field corn, Zea mays L., which were grown under two different light intensity regimes (high and low). Larval feeding rates were greatest on the DIMBOA A-less mutant (lacking the cyclic hydroxamate) and the low-DIMBOA inbred WF9 and lowest for the high-DIMBOA U.S. inbred B49 and the tropical genotype, San Juan × Antigua, under both light regimes. Significantly greater feeding rates were observed under the low-light-intensity compared to the high-light-intensity regime for all 4 Caribbean genotypes tested and WF9. The biochemical mechanism responsible for the reduced consumption rates of larvae on these varieties under the high-light regime is unlikely to be DIMBOA (2,4 dihydroxy-7-methoxy-1,4 benzoxazine-3-one) since its concentrations in leaves of the high-intensity regime were lower in all cases in which significant differences were observed. Leaf nitrogen concentrations were greater in the low-intensity regime and may be at least partially responsible for the greater feeding rates of larvae in this regime. | id |
