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Influence of Cropping Systems on Stem Rot (Sclerotium rolfsii), Meloidogyne arenaria, and the Nematode Antagonist Pasteuria penetrans in Peanut

July 2001 , Volume 85 , Number  7
Pages  767 - 772

P. Timper , N. A. Minton , and A. W. Johnson , USDA ARS, P.O. Box 748, Tifton, GA 31793 ; T. B. Brenneman and A. K. Culbreath , Department of Plant Pathology, University of Georgia, P.O. Box 748, Tifton 31793 ; G. W. Burton , USDA ARS, P.O. Box 748, Tifton, GA 31793 ; and S. H. Baker and G. J. Gascho , Department of Crop and Soil Sciences, University of Georgia, Coastal Plain Experiment Station, P.O. Box 748, Tifton 31793

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Accepted for publication 31 March 2001.

The effect of crop rotation (main plots) and pesticide treatment (subplots) on stem rot (Sclerotium rolfsii), Meloidogyne arenaria, and the nematode antagonist Pasteuria penetrans was determined in a field experiment. The field site was naturally infested with all three organisms. Peanut (P) was rotated with 2 years of either cotton (Ct), corn (C), or bahiagrass (B). The pesticide treatments for the peanut crop were aldicarb (31 g a.i. per 100-m row), flutolanil (1.7 kg a.i./ha), aldicarb + flutolanil, and a control without either pesticide. Populations of M. arenaria were lower in peanut in the Ct-Ct-P than in P-P-P, C-C-P, or B-B-P plots and tended to be lower in plots treated with aldicarb. Abundance of P. penetrans endospores was highest in the P-P-P plots, intermediate in the B-B-P rotations, lowest in all other rotations, and was unaffected by aldicarb. The high endospore densities in the P-P-P plots may have contributed to the uncharacteristically low nematode populations in the monoculture. Incidence of stem rot in peanut was lowest in treatments with flutolanil, intermediate in the control, and highest in treatments with aldicarb alone. The greater canopy cover in aldicarb-treated plots may have created a conducive environment for S. rolfsii infection.

Additional keywords: Arachis hypogaea, gall indices, Gossypium hirsutum, Paspalum notatum, root-knot nematode, suppressive soil, thrips, Zea mays

The American Phyto-pathological Society, 2001