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Relationship Between Tillage and Nematicide, Fungicide, and Insecticide Treatments on Pests and Yield of Peanuts Double-cropped with Wheat. N. A. Minton, USDA-ARS, Department of Plant Pathology, University of Georgia, Coastal Plain Experiment Station, Tifton 31793-0748. A. S. Csinos, and L. W. Morgan (Emeritus). Department of Plant Pathology, and Department of Entomology, University of Georgia, Coastal Plain Experiment Station, Tifton 31793-0748. Plant Dis. 74:1025-1029. Accepted for publication 30 April 1990. This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1990. DOI: 10.1094/PD-74-1025.

The relationship between tillage and fenamiphos, aldicarb, PCNB, and chlorpyrifos treatments on damage caused by nematodes, soilborne fungi, and insects and yield of peanuts (Arachis hypogaea) double-cropped with wheat was studied. Minimum-tilled peanuts sustained greater damage by Meloidogyne arenaria than did conventional-tilled peanuts, but damage by Pratylenchus brachyurus was the same in both tillage treatments. Aldicarb and fenamiphos each applied at 2.8 kg/ha at planting were equally effective in reducing nematode damage in both tillage treatments. Mean yields across sites and fungicide-insecticide treatments were increased by nematicides only in 1985. Damage by Sclerotium rolfsii was greater with conventional tillage than with minimum tillage. PCNB (11.2 kg/ha) plus chlorpyrifos (2.2 kg/ha) applied in a 30-cm band 55 days after planting suppressed damage by S. rolfsii. The mean yield across three sites, 3 yr, two tillage treatments, and three nematicide treatments was 13.6% greater with the fungicide-insecticide treatment than with the control. Damage by Rhizoctonia solani did not differ in the two tillage treatments and was reduced significantly by the fungicide-insecticide treatments in only 1 of 3 yr. Mean peanut yield across three sites, 3 yr, three nematicide treatments, and three fungicide-insecticide treatments was 7.5% greater in conventional-tillage than in minimum-tillage plots. Maximum yields were obtained in conventional-tillage plots treated with nematicides and PCNB plus chlorpyrifos.