AN UPDATE ON XANTHOMONAS LEAF BLIGHT

Authors: SCHWARTZ, HOWARD - COLORADO STATE UNIVERSITY; Gent, David - Dave

Submitted to: Onion World
Publication Type: Trade Journal
Publication Acceptance Date: 7/31/2005
Publication Date: 12/1/2005
Citation: Schwartz, H.F., Gent, D.H. 2005. An update on xanthomonas leaf blight. Onion World.p. 26-28.

Interpretive Summary: Xanthomonas leaf blight, caused by the bacterium Xanthomonas axonopodis pv. allii, is a common foliar disease of onion. Environmental, host, and cultural factors affect the severity of the disease, but reductions in yield of 20% or greater are common. This article presents recent advances in understanding the disease and its casual agent. Xanthomonas leaf blight can be managed effectively by the integration of moderately resistant cultivars, strict sanitation of weeds, crop debris, and volunteer onion, sound cultural practices, and judicious use of chemical controls.

Technical Abstract: Xanthomonas leaf blight, caused by the bacterium Xanthomonas axonopodis pv. allii, is a common foliar disease of onion. Environmental, host, and cultural factors affect the severity of the disease, but reductions in yield of 20% or greater are common. This article presents a review of disease symptomology, etiology, epidemiology, and management. The disease can be managed effectively by the integration of moderately resistant cultivars, strict sanitation of weeds, crop debris, and volunteer onion, sound cultural practices, and judicious use of chemical controls.