Targeting Fungicides for Control of Southern Stem Rot on Peanut. A. S. Csinos, Department of Plant Pathology, University of Georgia, Coastal Plain Experiment Station, Tifton 31793-0748. . Plant Dis. 73:723-726. Accepted for publication 16 March 1989. Copyright 1989 The American Phytopathological Society. DOI: 10.1094/PD-73-0723.

The application of either PCNB 10G, PCNB-chlorpyrifos 10-2G, ethoprop-PCNB 3-10G, or PCNB 10G + ethoprop 10G in narrow bands (10 or 15 cm) centered over the row at half the recommended rate per hectare in many treatments resulted in significant increases in yield and disease control over the untreated control and was not significantly different from the recommended rate of the material applied in wider bands (30 or 41 cm). Narrow band width applications of the foliar-applied flutolanil 50WP and diniconazole 25WP tended to give increased yields and better control of diseases than wider band width applications. These data indicate that fungicide applications targeted to the site of initial infection of Sclerotium rolfsii on peanut will allow reduced rates of fungicides to be used with no loss in disease control. Rhizoctonia limb rot control will require different strategies.

Keyword(s): Rhizoctonia solani AG-4, white mold.