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Abstract
Effects of reduced tillage, resistant cultivars, and reduced fungicide regimes on peanut leaf spot disease were evaluated in small and large field experiments. Reduced tillage (Strip-till) delayed the onset of Early Leaf Spot Cercospora arachidicola Hori. (Early Leaf Spot) thus reduced the final incidence of leaf spot when compared to Conventional-till. Resistant cultivars (C99-R and MDR-98) were less infected by Cercospora arachidicola Hori. compared to that of the leaf spot susceptible cultivar, Georgia Green. Leaf spot severity was typically higher in the reduced fungicide regime (21- day Expanded Regime) when compared to the standard fungicide regime (14- day Regime). However, the 21- day fungicide regime in the strip-tillage system provided control of leaf spot that was comparable to that of the 14- day fungicide regime in conventional-tillage, especially in resistant cultivars. In the mulch amendment tests, leaf spot epidemics were not significantly affected the wheat mulch based on visual observations. However, mulch treatments had a significant effect on leaf spot when the number of lesions per leaflet were analyzed which suggest that the addition of mulch itself can provide some suppression of leaf spot epidemics. In addition to the much treatments, glyphosate did not significantly effect leaf spot of peanut.