Effects of Rotations with Susceptible and Resistant Peanuts, Soybeans, and Corn on Inoculum Efficiency ofCylindrocladium crotalariaeon Peanuts

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Abstract
Field microplots were infested with microsclerotia (ms) of C. crotalariae at about 35 ms/g soil. Susceptible ''Florigiant'' peanuts, resistant NC 3033 peanuts, soybeans (a host), and corn (a nonhost) were planted in all possible rotations in 1979 and 1980. ''Florigiant'' or ''NC 3033'' were planted in microplots in 1981 after rotations established in 1979 and 1980. Postharvest inoculum densities in 1979 and 1980 for ''Florigiant'' and soybeans were similar and greater than for ''NC 3033'' and corn. However, efficiency of ms to induce peanut root rot was high following ''NC 3033,'' intermediate following ''Florigiant,'' and low following soybeans. Variation in inoculum efficiency following different rotation crops was attributed to differences in ms genotype and phenotype, concentration of residual N in soil, and soil microflora.

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