Efficacy of Avermectins for Root-Knot Control in Tobacco

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Abstract
The efficacy of 3 novel experimental compounds (avermectin B1a, avermectin B2a, avermectin B2a 23-ketone) for control of M. incognita on tobacco was studied in field plots for 2 seasons. Application rates ranging 0.05-0.50 kg a.i.[active ingredient]/ha suppressed root galling and egg production. The number of M. incognita eggs per plant was inhibited 21-86% depending on rate and compound. Levels of control achieved by the avermectins were comparable to those of the registered compounds ethoprop and fenamiphos at 6.73 kg a.i./ha.

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