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henry_kuska

research on bacterial leaf spot of shrub roses

henry_kuska
14 years ago

Title: Effect of acibenzolar-S-methyl on bacterial leaf spot of shrub roses caused by a Xanthomonas sp.

Author: G. VALLAD (1)

Authors affiliation: (1) University of Florida, Wimauma, FL, USA

Published in: Phytopathology Volumn 99, No. 6 (Supplement), pages S132-133

Abstract: Shrub roses have gained popularity in modern landscapes due to their low maintenance and resistance to many of the diseases that plague the other modern and old garden roses. Recently, a Xanthomonas sp. was identified on shrub rose varieties '' and ' Knockout' that causes a bacterial leaf spot. This disease can be problematic during vegetative propagation and nursery production during the summer months in Florida. Acibenzolar-Smethyl,the active ingredient of Actigard (Syngenta Crop Protection,Greensboro, NC), is a plant defense elicitor with demonstrated efficacy in the control of several bacterial diseases of vegetables. Greenhouse and nursery trials were established to test the effect of Actigard on the severity of bacterial leaf spot on '' and ' knockout' roses. While lower rates of 0.25 to 0.5 oz of Actigard per 100 gallons were effective at reducing disease severity on potted roses and those in propagation liners, higher rates of 0.75 to 1.0 oz gave the best results. Multiple applications of Actigard (1.0 oz/100 gal) prior to disease development improved bacterial leaf spot control over single applications. Results demonstrate the potential of expanding the use of Actigard to manage diseases of ornamental and nursery species.

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