Curative and residual efficacy of injection applications of avermectins for control of plant-parasitic nematodes on banana
1997
Jansson, R.K. | Rabatin, S.
Studies were conducted to determine the curative and residual efficacy of avermectins at controlling plant-parasitic nematodes when injected into the pseudostem of banana, Musa acuminata cv. Cavendish. In addition, we determined the lowest concentration of avermectins that provided satisfactory efficacy as protectants when injected into banana pseudostems. Experiments were conducted with a root-knot nematode, Meloidogyne javanica, and the burrowing nematode, Radopholus similis. Injections (1 ml) of greater than or equal to 100 micrograms a.i./plant of abamectin into pseudostems were effective at controlling M. javanica and R. similis, and were comparable to control achieved with a conventional chemical nematicide, fenamiphos, in a protectant assay. Abamectin injections of 250 and 500 micrograms a.i./plant were effective at reducing nematode infections 28 to 56 days after inoculation. Abamectin was more effective than ivermectin at controlling nematodes after nematode populations were established in banana roots. Injections of between 100 and 1,000 micrograms a.i./plant were effective at controlling nematodes for at least 56 days after treatment. These studies confirmed earlier results and demonstrated that abamectin has potential for controlling nematode parasites on banana when injected into the pseudostem.
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