Abstract
The influence of crop species on the soil populations of 4 species of Pratylenchus (P. hexincisus Taylor and Jenkins, P. scribneri Steiner, P. neglectus Rensch, and P. penetrans Cobb) was studied for 5 years in 16 fields rotated to corn, soybeans, oats, wheat, and forage mixtures. Each field was sampled each year between mid-July and Mid-August. The populations of P. hexincisus, P. scribneri, and P. penetrans increased in soil in which corn was growing. Populations of P. penetrans, P. scribneri, and P. lneglectus increased in soils in which soybeans were growing. P. hexincisus and P. neglectus were capable of producing moderate populations on oats. P. neglectus was the only Pratylenchus species which built lip on wheat. P. scribneri was found in moderate numbers in fields containing forage mixtures of alfalfa, red clover, and brome grass.
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