First Report of Leaf Necrosis Caused by Pseudomonas viridiflava on Melon Seedlings in Italy

Plant Disease
C MorettiR Buonaurio

Abstract

In April 2001, necrotic lesions surrounded by thin, water-soaked halos were observed on cotyledons of 12-day-old melon seedlings (Cucumis melo var. reticulatus, cv. Baggio, Calipso, and Proteo) grown in plant beds in an unheated greenhouse located in the Province of Perugia (central Italy). The incidence of the disease was approximately 10%, and the economic impact was limited as seedlings recovered from the disease. Cream-colored, mucoid, bacterial colonies were consistently isolated on nutrient agar from the diseased leaf tissues. Two representative strains selected for identification were gram negative, fluorescent on King's medium B, and had oxidative but not fermentative metabolism. They were levan negative, oxidase negative, potato rot positive, arginine dihydrolase negative, and tobacco hypersensitive response positive in LOPAT tests. These isolates showed pectolytic activity at pH 8 but not at pH 4 and utilized L-arabinose, D(-)-tartrate and L-lactate. They did not utilize sucrose, L(+)-tartrate, or trigonelline, and did not produce acid from sucrose after 21 days of incubation. These results were similar to those obtained with the type strain LMG 2352T of Pseudomonas viridiflava (Burkholder) Dowson. Although suitable f...Continue Reading

Citations

Jan 9, 2015·Clinical Microbiology Reviews·Cassandra White, Carlos Franco-Paredes
Sep 1, 2021·Molecular Plant Pathology·Savana M Lipps, Deborah A Samac

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