Research Papers: Relation of Fertilizer Treatments and Cropping Sequence to Populations of Pratylenchus scribneri
Keywords:Lesion Nematodes, Population Dynamics, Pest Management, Glycine Max, Gossypium hirsutum, Vicia sativa, Trifolium incarnatum, Zea mays
AbstractSoil and root populations of Pratylenchus scribneri Steiner in a continuing three-year rotation scheme responded to crop development. The rotation scheme consisted of summer crops of corn, soybean, and cotton, followed, respectively, by wheat, fallow, and mixed common vetch and crimson clover. The rotation was superimposed on plots that received combinations of N, P, K, minor elements, and lime. Populations of the nematode were unrelated to rainfall or changes in soil temperature. Among the summer crops, highest numbers of the parasite were detected in plots with corn, followed by soybeans and cotton in descending order. The inclusion of wheat or winter legume in the rotation sequence resulted in low numbers of P. scribneri. Results indicated that highest populations of the nematode were not necessarily found in plots receiving complete nutrient regimes. Seasonal changes in numbers of P. scribneri in plots with different fertilization regimes were significantly correlated.