Effects of Reduced Tillage, Resistant Cultivars, and Reduced Fungicide Inputs on Progress of Early Leaf Spot of Peanut (Arachis hypogaea)

Plant Disease
W S MonfortS C Phatak

Abstract

Field experiments were conducted in 2000 and 2001 on Georgia Green, Florida MDR-98, and C-99R peanut (Arachis hypogaea) cultivars in Tifton, GA, to determine the effects of tillage practices on early leaf spot (Cercospora arachidicola) epidemics under standard fungicide regimes and fungicide regimes with fewer applications. Leaf spot epidemics were suppressed in reduced tillage (strip-till) plots compared with conventional tillage plots and were suppressed in MDR-98 and C-99R cultivars compared with the standard runner-type cultivar, Georgia Green. Within tillage and cultivar combinations, leaf spot intensity typically was lower in plots treated with fungicides at standard intervals (seven total applications) than in those treated at extended intervals (four total applications). However, in most cases, leaf spot control in extended interval treatments in the strip-till system was comparable to that in the standard interval treatments in conventional tillage. Based on these results, the number of fungicide applications could be reduced without compromising control of leaf spot when reduced tillage is used, especially if combined with moderately resistant cultivars. Suppression of leaf spot epidemics in the strip-till plots did n...Continue Reading

References

Jan 1, 1993·Medicine and Science in Sports and Exercise·B E AinsworthR S Paffenbarger
Mar 12, 2004·Annual Review of Phytopathology·W W Bockus, J P Shroyer
Dec 1, 1997·Plant Disease·A K CulbreathH R Pappu

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Citations

Oct 2, 2019·Plant Disease·Abraham M FulmerEmily G Cantonwine
Jul 1, 2007·Plant Disease·E G CantonwineK L Stevenson
Oct 24, 2008·Phytopathology·E G CantonwineK L Stevenson
Apr 1, 2006·Plant Disease·E G CantonwineB G Mullinix

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