Four runner-type peanut (Arachis hypogaea L.) cultivars, moderately resistant to Pythium myriotylum pod rot andor southern blight (Sclerotium rolfsii), and Florunner were compared under full-tillage, minimum-tillage, and no-tillage cultural systems from 1985 to 1987. Disease, yield, and grade evaluation were made to ascertain if the soilborne disease resistance would be beneficial to peanut production under minimum-tillage systems. Averaged over genotypes, yield was 500 kg/ha more with full-than no-tillage. In one of three years, Florunner yielded less than the highest yielding cultivar. Neither pod rot nor southern blight was a major deterrent to minimum-tillage production. Genotype differences in number of southern blight infection sites, over tillage systems, occurred in two years but the relative disease incidence was inconsistent among cultivars over years. More pod discoloration occurred in Florunner than in all other cultivars in two of three years. Percent sound mature kernels (SMK) + percent sound-split kernels (SS) averaged 3.6% less for the no-tillage than for the full-tillage system, and in all years the grade for Florunner was as good or better than for all other cultivars. A significant genotype x tillage system interaction was apparent for SMK + SS. TX835820 and TX835841 grades were significantly lower with no-tillage systems while other cultivars produced no significant changes in grade.
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Keywords: Groundnut, Sclerotium rolfsii, Southern blight, no-tillage, minimum-tillage
How to Cite:
Grichar, W. & Smith, O., (1991) “Effects of Tillage Systems on Southern Blight and Pod Yields of Five Runner Peanut Genotypes”, Peanut Science 18(2), p.144-147. doi: https://doi.org/10.3146/i0095-3679-18-2-19