Abstract
Three different mulching materials — hay, black polyethylene film, and translucent polyethylene film — produced different soil temperatures and thus influenced the microflora of the soil differently.Rhizoctonia solani Kuehn increased in cool or moderate temperatures under hay or black film but not in warmer soil beneath translucent film. Populations of a meadow nematode,Pratylenchus penetrans Cobb were reduced approximately two-thirds under the black film. Under this film conditions apparently favor biological control ofP. penetrans. Over several months this control was destroyed if a fungicide, pentachloronitrobenzene, and a nematocide, dibromochloropropane, were added. Evidently, the fungicide inhibited organisms predaceous onP. penetrans at the same time it inhibitedR. solani.
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