Submitted to: Phytopathology
Publication Type: Abstract Only
Publication Acceptance Date: 6/1/1997
Publication Date: N/A
Technical Abstract: Rhizoctonia solani causes wirestem of cole crop seedlings, which results in economic losses to vegetable producers. An increased rate of fertilization and withholding of water during transplant production were evaluated alone and in combination to determine their effects on transplant susceptibility to R. solani. Treatments were applied to broccoli and cabbage seedlings before they were transplanted into soil artificially infested with R. solani AG-4 at 17-35 sclerotia/kg of soil. In one field and two of three growth room experiments, the combined wirestem severity rating for both crops was significantly greater (P<0.02) for fertilized than it was for non-fertilized transplants. Area under the disease progress curve also was significantly greater for non-fertilized transplants. In one field and one growth room experiment, wirestem severity was less (P<0.08) for transplants that had water withheld than for rthose watered normally. During transplant production, fertilizer increase susceptibility whereas withholding water may have decreased susceptibility of broccoli and cabbage to R. solani.