Influence of Crop Rotation on Survival of Verticillium albo-atrum in Soils

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Abstract
Inoculum density of V. albo-atrum was followed in soil of 8 variously cropped commercial fields at about monthly intervals for 3.5-4.0 yr. High inoculum densities (20-60 microsclerotia/g soil) persisted under continuous susceptible crop (cotton [Gossypium hirsutum]) culture in infested fields. The inoculum usually increase rapidly following 1 yr of a susceptible crop, with a higher inoculum density often occurring the 2nd yr regardless of whether the subsequent crop was a nonsusceptible or a susceptible host. Once soils were infested, the rate of decrease in inoculum, even in the presence of immune crops, was very low and seasonal decreases in inoculum in continuous susceptible crop culture were similar to seasonal decreases during immune crop culture. Immune-host culture has little influence on V. albo-atrum survival in soils and the pathogen''s rate of attrition is too low to make short-term rotations of value for wilt control.

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