Previous View
APSnet Home
Phytopathology Home


Effect of Benomyl on Eradication of Ustilago striiformis from Agrostis palustris and on Plant Growth. Philip W. Robinson, Research Assistant, Iowa State University, Ames 50010; Clinton F. Hodges, Associate Professor of Horticulture and Agronomy, Iowa State University, Ames 50010. Phytopathology 62:533-535. Accepted for publication 10 December 1971. DOI: 10.1094/Phyto-62-533.

Benomyl eradicated Ustilago striiformis from Agrostis palustris in pot culture after 4 weeks’ exposure to 700 mg/liter active ingredient per pot. Low fungicide dosages failed to eradicate U. striiformis after 5 weeks. Histopathological examination of nodes of stolons produced on treated plants confirmed eradication of the pathogen. Increasing rates of benomyl caused a decrease in dry weight of all plants; stripe-smutted plants, however, had higher dry weights than healthy plants, indicative of a temporary stimulatory effect between benomyl and U. striiformis. Healthy and stripe-smutted plants exposed to several rates of benomyl displayed abnormal stolon proliferation which was interpreted as a phytotoxic response.

Additional keywords: systemic control, growth regulation.