Effect of the Plant Growth Retardant Pydanon on Verticillium Wilt of Cotton and Tomato

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Abstract
Root drench treatment of cotton and tomato plants with Pydanon (200 mg/plant) before inoculation with V. dahliae (microsclerotial strain) reduced the severity of foliar and vascular discoloration symptoms of Verticillium wilt. The protective effect of Pydanon was more marked than its curative effect. Foliar treatments with Pydanon (2000 and 4000 .mu.g/ml) were less effective than soil treatments against Verticillium wilt. Pydanon was not toxic to growth of V. dahliae on potato-dextrose agar or to the formation of spores in a shaken synthetic nutrient solution. No ethanol-extractable antifungal compounds could be detected in xylem tissue of treated cotton plants. Pydanon interfered with GA induction of .alpha.-amylase activity in barley endosperm.

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