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Subject: Causal agent and vector determined for Cucurbit yellow vine disease (CYVD)
Date posted: August 08, 2003
Source: Promed
Bacteria were cultured from the phloem of Citrullus lanatas (watermelon) and Cucurbita pepo (field pumpkin) plants displaying symptoms of Cucurbit yellow vine disease (CYVD). Bacteria that tested positive in a CYVD-specific polymerase chain reaction (PCR) were gram-negative, morphologically identical, and characterized as Serratia marcescens. Greenhouse and field grown squash plants were inoculated with S. marcescens by puncture inoculation and enclosure with S. marcescens-fed squash bugs (Anasa tristis) respectively. Sixty-percent of the greenhouse-grown and 17% of the field-grown plants developed symptoms of, and tested positive for, S. marcescens. This study confirms S. marcescens is the causal agent of CYVD and A. tristis is the vector.

Cucurbit yellow vine disease (CYVD) is found in production areas from the Midwestern to the Northeastern United States and can cause heavy losses to watermelon, pumpkin, cantaloupe, and squash. Symptoms of CYVD are phloem discoloration, foliar yellowing, wilting, and plant decline.

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Archive No.: 20030731.1878

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03/05/02