A. Balamurugan and M. Muthamilan Department of Plant Pathology, Tamil Nadu Agricultural University Coimbatore, India K. Sakthivel Indian Council of Agricultural Research, Central Island Agricultural Research Institute Andaman and Nicobar Islands, India A. Kumar Division of Plant Pathology, Indian Council of Agricultural ResearchIndian Agricultural Research Institute New Delhi, India Email: abalamurugan555@gmail.com
Host: Lycopersicon esculentum Mill. (tomato)Disease name: Tomato bacterial wilt Pathogen: Ralstonia solanacearum (Smith) Yabuuchi et al.
The characteristic "oozing out" from the cut end of an infected stem. Ralstonia solanacearum, the causal agent of bacterial wilt disease in tomato, is one of the most devastating plant-pathogenic bacteria worldwide. The freshly cut end of an infected tomato stem exudes the milky white, slimy ooze from the vascular system into clear water. That bacterial ooze into water may appear as “smoky strands or bacterial falls or bacterial streaming,” contains many bacterial cells, and is a common signature of bacterial wilt disease caused by R. solanacearum. This ooze-out test is a preliminary diagnostic tool for quick and easy detection of R. solanacearum in the field and under laboratory conditions.
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