Research Papers: Effect of Ethoprop, Carbofuran and Aldicarb on Flue-Cured Tobacco Infected with Three Species of Meloidogyne

Abstract

Ethoprop, carbofuran and aldicarb were applied at 6.7 kg a.i./ha broadcast to field microplots (76 cm diam) separately infested with Meloidogyne javanica, M. incognita or M. arenaria. Initial population densities of the three species averaged 70, 120 and 170 nematodes per 250 cm of soil, respectively. Two flue-cured tobacco seedlings ('McNair 944') were transplanted into each microplot, and each treatment was replicated six times. Aldicarb significantly increased yields of tobacco infected with all nematode species, whereas ethoprop failed to increase yields of tobacco infected with M. javanica. Carbofuran did not significantly increase yields. Numbers of nematodes of the three species taken at 11 and 15 weeks after planting were reduced by aldicarb and ethoprop, but not by carbofuran. All three nematicides increased plant heights up to 70 days after planting with the exception of carbofuran for plants infected with M. javanica. Gall index ratings at final harvest were high and did n