Increase in Cabbage Yield by Fenamiphos Treatment of Uninfested andHeterodera schachtii-Infested Field Soils

N-Serve) was applied similarly at 2,337 Abawi, G. S., and Mai, W. F. 1983. Increase in cabbage yield by fenamiphos treatment of ml of 24E formulation per hectare. uninfested and Heterodera schachtii-infested field soils. Plant Disease 67:1343-1346. In some treatments, soil was autoclaved 3 of each Applications of fenamiphos did not significantly affect the final population of H. schachtii. The soil was added to the appropriate tiles. influence of fenamiphos on cabbage yield was minimal when field soils were pretreated with Telone The center of each microplot was C-I17 at 374 L/ ha or by autoclaving. Increase of cabbage yield by fenamiphos, however, occurred in planted with three seeds of the cabbage field soils previously pasteurized for 30 min at 50 C. Intermediate increases with fenamiphos were cultivar Roundup and later thinned to also obtained in soils previously pasteurized at 60, 70, or 80 C. A similar effect on cabbage yield was one seedling. When needed, extra seeds obtained with aldicarb at 6.7 kg a.i./ ha. Control of foliar insects by fenamiphos and aldicarb did were also planted at the edges of tiles for not explain the observed increase in cabbage yield. Soil treatment with the miticide propargite, the ealso plantedttvtheaedgesof tilesrfo nitrification inhibitor nitrapyrin, and the fungicide metalaxyl (selectively active against early destructive sampling. Cultural pythiaceous fungi) did not increase cabbage yield. These data indicate that higher yields of cabbage practices rilizerbicid insecand obtained by treating soil with fenamiphos or aldicarb are due to control of soilborne biological planting, fertilizers, and insect and