Abstract
The effect of Steinernema carpocapsae Weiser on the infection rate of plant-parasitic nematodes varys with the change of host plants. On adzuki bean and tomato seedlings, S. carpocapsae reduced the infection of Pratylenchus coffeae (Zimmermann) Filipjev & Schuurmans Stekhoven by 85% and 88%, respectively, and that of Meloidogyne javanica (Treub) Chitwood by 39% and 78%, respectively. However, on radish seedlings it had no effect on M. javanica yet increased the infection of P. coffeae by 160%. The ratio of Steinernematids to plant-parasitic nematodes was 100:1 when applied to sterile sand in the above experiments. S. carpocapsae did not affect the infectivity of P. coffeae on edible rape seedlings on water agar at the application ratio of 50:1. The mechanism of interaction in the triangle of S. carpocapsae, plant-parasitic nematodes, and host plants was suggested to be more than just competition for root surface.
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