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Population Fluctuations of Nematodes Associated With Red Pine Seedlings Following Chemical Treatment of the Soil1)

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Thirteen genera of stylet-bearing nematodes, two taxonomic groups (Dorylaimidae and Hetero deridae), Mononchus sp. and nonstylet-bearing nematodes were found associated with red pine seedlings in a West Virginia nursery. The most prevalent plant-parasitic nematodes were Paratylen. chus sp., Hoplolaimus galeatus, and a Trichodorus sp. D-D mixture, methyl bromide, Nemagon, and Vapam were evaluated for their effectiveness to control the nematodes. Only methyl bromide gave satisfactory control of the plant-parasitic nematodes; however, after the second growing season, the nematode population levels of all treated plots were less than those for the control. Bacterium-and fungus-feeding nematodes accounted for the rapid increase in the populations following methyl bromide treatment. Population levels of all the nematodes increased after all treatments and reached a peak in October of the first year. The populations declined during the winter months, and rose again the second year. A species of Eucephalobus was the most common nonstylet-bearing nematode, while a Mononchus sp. was the predominant predaceous nematode. A temporary decline in the total nematode populations during the first growing season was thought to be caused by the feeding activities of the high populations of Mononchus.

Affiliations: 1: Department of Plant Pathology, Bacteriology, and Entomology West Virginia University, Morgantown, U.S.A


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