Southern Blight and Leafspot Control in Peanut Using Selected Fungicides

Abstract

New fungicides, evaluated from 1989 to 1992, compared favorably with standard treatments of pentachloronitrobenzene (PCNB) and chlorothalonil (Bravo) in controlling southern blight and leafspot. Tebuconazole (Folicur) significantly increased yields 13% to 77% and reduced leafspot infection 43% to 85% over the untreated check in a 3-year period. Southern blight control was obtained using tebuconazole, propiconazole (Tilt), flutolanil (Moncut) and fluazinam at both the Lavaca and Frio County test sites when applied foliar, banded or broadcasted. In 1992, flutolanil applied at flowering and mid-peg reduced disease incidence by 83% over the untreated check. In 1991, flutolanil and tebuconazole treatments significantly increased yields over the untreated check. In 1992, only tebuconazole applied 6 oz acre^-1 significantly increased yield when compared to untreated check. However, most treatments numerically yielded better than the untreated check all four years.