Abstract
SUMMARYStudies were made to determine the effect of starvation on the susceptibility of Longidorus elongatus to nematicidal chemicals. In vitro studies, using stylet protraction as a measure of susceptibility, showed that the EC50 for nematodes exposed to oxamyl for 5 min was 6‐5 μg cm‐3 for starved nematodes and 7‐7 μg cm‐3 for well‐fed specimens. In pot studies aldicarb and oxamyl, applied at half the normal commercial rates, decreased the numbers of starved, but not of well‐fed, L. elongatus. In a field study aldicarb, oxamyl and the fungicide quintozene decreased the numbers of starving and well‐fed L. elongatus. Oxamyl was more effective than aldicarb and the numbers of L. elongatus were decreased more in plots previously fallowed than in those cropped with a grass/clover mixture. A significant interaction between oxamyl treatment and initial crop was found. Starved L. elongatus appear to be more susceptible to carbamate nematicides than well‐fed ones. Quintozene decreased numbers of L. elongatus more, and for a longer period of time, than either of the systemic nematicides. The mode‐of‐action of the nematicidal chemicals is discussed.
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