Abstract
The distribution of Meloidogyne spp. in southwestern Indiana was determined in a county-wide survey in two counties and at two farm operations with a history of Meloidogyne infestation. Meloidogyne spp. were found within the Eolian sand deposits in southern Knox Co. and in the northern and central parts of Daviess Co. Meloidogyne spp. were found in approximately 80% of production fields on the two farms south-southeast of Vincennes, Knox Co. In addition, a transect study was conducted in a soybean (cv. 93M90) field to quantify suspected damage from Meloidogyne incognita. In this field, areas of varying sizes contained stunted and chlorotic soybean plants typical of nematode damage. In single transects through each of three damaged areas, plant weights, nematode-induced root galling, nematode densities, and soil chemical and physical properties were taken at 1.5-m intervals. Multiple regression analysis was conducted with the plant, nematode, and soil parameters determined for each location. The amount of nematode-induced galling had the greatest contribution (R2 = 0.40, P < 0.01) to reduced plant top biomass in the damaged soybean areas. Accepted for publication 18 July 2007. Published 31 October 2007.
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