Effect of metam sodium, peanut genotype and inoculum density on incidence of Cylindrocladium black rot
WO Cline; MK Beute
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Abstract: Metam sodium was applied as an in-row preplant fumigant in field microplots planted with three peanut genotypes. Preplant inoculum densities of Cylindrocladium crotalariae were reduced 67% as compared to untreated controls. End-of-season inoculum densities were reduced an average of 32%. Across-plot soil sampling revealed no microsclerotia in treated row centers. Plantings of CBR-susceptible cultivar Florigiant with metam sodium treatments resulted in partial control of pod and root rot (caused by C. crotalariae), but high final inoculum densities. Metam sodium with moderately-resistant NC 8C resulted in reduced pod and root rot and intermediate levels of inoculum density. Lowest levels of pod rot and root rot occurred with metam sodium and highly resistant genotype NC 18016. Inoculum density did not increase where NC 18016 was used. With all genotypes, resistance was the dominant factor in maintaining low final inoculum levels.