Controlling parasitic nematodes and soil-borne diseases of potatoes with soil fumigation

The fumigation of soil infested with a moderate population of parasitic nematodes and fungi very effectively improved the growth, quality and yield of potatoes. The beneficial effects of fumigation with DD and Vorlex were mainly attributed to control of nematodes, particularly the meadow nematode. However, the fumigants did effectively reduce the population ofRhizoctonia solani on potato roots and “scurf” on tubers caused byR. solani. Also less vascular browning of tubers developed in fumigated soil. Thus the effects of soil fumigation were complex, affecting many microorganisms and consequently producing numerous manifestations in the growth of potatoes.