Effects of Chemigated and Conventionally Sprayed Tebuconazole and Tractor Traffic on Peanut Diseases and Pod Yields. T. B. Brenneman, Department of Plant Pathology, University of Georgia, Coastal Plain Experiment Station, Tifton 31793-0748. D. R. Sumner, Department of Plant Pathology, University of Georgia, Coastal Plain Experiment Station, Tifton 31793-0748. Plant Dis. 73:843-846. Accepted for publication 24 May 1989. Copyright 1989 The American Phytopathological Society. DOI: 10.1094/PD-73-0843.

Tebuconazole (252 g a.i./ha) was applied as Folicur 1.2 EC seven times to Florunner peanuts via ground sprays or center-pivot irrigation (chemigation). Tebuconazole applied via chemigation was diluted in water or nonemulsifiable oil and applied in 25.4 kl/ha of water. Chemigated plots either did or did not receive tractor traffic after each application. Plants in nontreated plots were defoliated by late leaf spot (Cercosporidium personatum) in 1987 and 1988. Significant Rhizoctonia limb rot (R. solani AG-4) was present only in 1987 and symptoms were reduced by all fungicide treatments; plants in plots not receiving tractor traffic had the least limb rot. Ground sprays and chemigation using the oil diluent gave the best control of leaf spot. Mean yields of chemigated plots were 6,137 kg/ha vs. 5,792 and 2,808 kg/ha for the ground-sprayed and nonsprayed plots, respectively.