Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Outbreak of tobacco streak virus causing necrosis of cucumber (Cucumis sativus) and gherkin (Cucumis anguria) in India.

Abstract

During the 2000-02 rainy and summer seasons, a new virus disease causing yield losses of 31-75% in Bangalore, Bellary, Davanagiree, and Tumkur districts of Karnataka, India, infected cucumber and gherkin. Symptoms were tip necrosis characterized by necrotic lesions on leaves, and a general leaf and stem necrosis extending to midveins, petioles, flower buds and tip, eventually resulting in dieback of vines. Based on host range, serological relationship, electron microscopy and sequence analysis of the coat protein region, the virus was identified as a strain of tobacco streak virus (TSV). This is thought to be the first report of natural occurrence of TSV on cucumber and gherkin in India.