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Disease Control and Pest Management

Effect of Soil Fumigation on the Apple Replant Disease in Washington. Ronald P. Covey, Jr., Associate plant pathologist, Washington State University, Tree Fruit Research Center, Wenatchee, 98801; Nels R. Benson(2), and W. A. Haglund(3). (2)Horticulturist and soils scientist emeritus, Washington State University, Tree Fruit Research Center, Wenatchee, 98801; (3)Plant pathologist, Washington State University, Northwestern Washington Research and Extension Unit, Mount Vernon, 98273. Phytopathology 69:684-686. Accepted for publication 30 January 1979. Copyright 1979 The American Phytopathological Society. DOI: 10.1094/Phyto-69-684.

Chloropicrin and methyl bromide soil fumigation controlled the apple replant disease in Washington apple orchards. Nematicidal rates of Telone (1,3-dichloropropene, and related chlorinated hydrocarbons) failed to control this disease, which eliminated the possibility that nematodes are involved. Some biotic factor, not arsenic, may be the primary cause of the apple replant problem in the irrigated areas of eastern Washington, but no specific microorganism has been identified.