NPDN 2007 Meeting - Diagnosing bacterial leaf streak of rice

NPDN National Meeting 2007

Poster Abstract

Diagnosing bacterial leaf streak of rice

Authors: JOY PIERZYNSKI (1), Judy O'Mara (1), Ned Tisserat (2)

Affiliations: (1) Kansas State University; (2) Colorado State University

Bacterial leaf streak, caused by Xanthomonas oryzae pv. oryzicola is widely distributed in tropical and subtropical Asia, including China, Thailand, Malaysia, India, Vietnam, the Philippines, and Indonesia, but is not found in temperate areas such as Japan and Korea. It also has recently become a significant problem in western Africa. The pathogen has not been reported in the United States and is currently on the national select agent list. Major concerns are that the pathogen is seed borne and, once introduced, is difficult to control. Available reports suggest that bacterial streak can cause yield losses of up to 17%, depending on the rice variety and climatic conditions. Bacterial streak initially develops as interveinal, water-soaked leaf streaks or spots that eventually turn yellow to orange and exude bacterial ooze, but field diagnosis may be complicated by various nutritional problems or leaf diseases that exhibit similar symptoms. Confirmation of X. oryzae pv. oryzicola requires culturing and biochemical, serological or molecular-based diagnostics. However, there currently is a lack of an accurate, rapid and validated diagnostic method for identifying this pathogen.

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