Abstract
Host-plant resistance to the European corn borer is manifested as increased larval mortality, inhibition of larval growth, and reduction in larval feeding. Leaf lesions caused by larval feeding are smaller and fewer per infesting borer on resistant lines than on susceptible lines of corn. Resistance factor A (6-methoxybenzoxazolinone) exerted a deleterious effect on feeding of firstinstar larvae, acting as a feeding deterrent and not as a simple repellent. Reducation in duration of larval feeding was proportional to RFA concentration, but inhibition of larval growth by RFA could not be accounted for on this basis. No significant correlation between feeding suppression and growth inhibition was found in experiments using a series of 15 benzoxazolinone and benzothiazole analogs. Lowering of RFA inhibitory action by high concentration of dietary sugar was not caused by a masking of RFA effects on feeding behavior. The available evidence indicates that RFA inhibited larval growth by metabolic action, not via behavioral effects. Under field conditions, larval mortality on borer-resistant plants was higher than that observed in the laboratory among larvae on purified diets containing comparable concentrations of RFA. The reduced feeding and inhbiited growth induced by RFA probably tends to increase larval mortality through prolonging the exposure of the weakened larvae to adverse environmental conditions.
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