Management of peanut diseases with reduced input fungicide programs in fields with varying levels of disease risk
2010
Woodward, J.E. | Brenneman, T.B. | Kemerait, R.C. | Culbreath, A.K. | Smith, N.B.
Field experiments were conducted in 2003 and 2004 to evaluate full and reduced input fungicide programs in peanut fields with varying levels of risk for the peanut leaf spot complex (caused by Cercospora arachidicola and Cercosporidium personatum). Fungicides applications were made on a 14-, 21-, or 28-day interval (d.i.). Leaf spot intensity was similar for all programs in fields considered to be low or moderate risk; however, there was more leaf spot in plots treated on a 28-d.i. for high risk fields. Incidence of stem rot (caused by Sclerotium rolfsii) was lower in plots treated with soilborne-based programs than those treated with foliar-based programs. Control for the 21- and 28-d.i. soilborne-based programs was comparable to that for the 14-d.i. program in all trials except the high risk situations where plots treated on the 28- d.i. had higher levels of stem rot. Pod yields were similar among application intervals for all trials. Based on these results, reductions in the number of fungicide applications can be made without compromising leaf spot control, stem rot control, or yield.
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