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Influence of Rotation and Fumigation On Root-Knot Nematode Populations On Grape Replants

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Replanting after rotation by keeping land free of vines up to three years followed by soil fumigation with D-D and Telone at different rates was tested for control of root-knot nematodes in a vineyard of Thompson seedless variety. Soil samples were taken to a depth of 244 cm (8 ft) at 30.5 cm (1 foot) intervals and assayed by tomato plants in the greenhouse. In one sampling heavy populations were found 366 cm (12 ft) deep and a few galls were on roots as deep as 518 cm (17 ft). Treatment at 561 1, or more/hectare (60 gal./acre) after 2 or 3 years rotation gave complete kill as measured by the soil samples. However grape replants in all treatments were uniformly infected after two growing seasons. Where no vine free period was allowed before replanting, control of nematodes was restricted to the top 122-183 cm (4-6 ft) of soil with some nematodes surviving at 213-244 cm (7-8 ft) even at dosages up to 1964 l/hectare (210 gal./acre). Samples of roots growing from the previous planting indicated that nematode survival was aided by undecomposed roots where replanting followed immediately or after 1 year. After two growing seasons all the replants were uniformly and heavily infected with root-knot nematodes.

Affiliations: 1: Department of Nematology, University of California, Davis, California, U.S.A


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