Acidovorax citrulli ZJU (b-proteobacteria) genome assembly Acidovorax avenae subsp. citrulli from Institute of Biotechnology [GCA_ Bacterial fruit blotch is caused by Acidovorax avenae subsp. citrulli. The disease was first detected in Florida in and was subsequently detected in South. Acidovorax citrulli is the causal agent of bacterial fruit blotch and seedling blight Synomyms: Acidovorax avenae subsp. citrulli, Pseudomonas.

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On nutrient agar, colonies are susp.citrulli with slightly scalloped or spreading margins. Detection of the watermelon fruit blotch pathogen on seeds with the polymerase chain reaction.

First report of bacterial fruit blotch of watermelon in Oklahoma. Infected seeds and seedlings are the most important primary sources of inoculum in commercial fruit production field. In a recent study, it was reported that A.

EPPO Global Database

Standard greenhouse sanitation practices should preclude perennation of the pathogen associated with plastic trays used for watermelon seedling production. European and Mediterranean Plant Protection Organization. Leaf lesions in the field do not result in defoliation, but are important suvsp.citrulli of bacteria for fruit infection.

Description Top of page A. Fruit blotch was prevalent in Georgia in and was especially widespread incausing losses in thousands of hectares distributed over at least 10 states.


Do not work in an infested field if the foliage is wet. Symptoms can be produced in all cucurbits tested by inoculation, especially in the seedling stage Schaad et al.

Acidovorax citrulli (fruit blotch)

This mechanism of seed infestation provides a possible explanation for the production of contaminated seedlots from fields with no visible BFB symptoms. The primers amplified DNA from all A. Wet seed treatment with peroxyacetic acid for the control of bacterial fruit blotch and other seedborne diseases of watermelon.

Survival of the watermelon fruit blotch pathogen Acidovorax avenae subsp. Surface lesions cease to enlarge after harvest.

Using immunomagnetic separation and PCR, A.

Infested seeds are normally the primary source of inoculum, and secondary spread of bacteria is due to the splash-dispersal facilitated by overhead irrigation that generates bacterial aerosols.

As the growing season progresses, leaf symptoms may become sparse and inconspicuous. Host-Plant Resistance Fruit of some cultivars are more susceptible to bacterial fruit blotch than others. Occurrence of a bacterial watermelon fruit blotch in Florida. Although, there is currently no evidence of systemic A. Cracks in the rind surface may occur, resulting in fruit rot. There is zero tolerance for contaminated seed and any infested seed lot is rejected. Nomura T; Shirakawa T, Plant Disease, 84 4: Detection and Inspection Top of page Inspect young cucurbit seedlings for the typical water-soaked areas on the underside of cotyledons and the restricted lesions that turn dark brown and often extend along the length of the cotyledon midrib Webb and Goth, Longevity of the pathogen decreased with increasing storage temperature.


Bacterial fruit blotch of watermelon.

Acidovorax avenae subsp. citrulli – Genome – Assembly – NCBI

Watermelon fruit blotch infection rates in diploids and triploids. Inspect cucurbit transplants for small, dark brown lesions, often surrounded by a band of chlorotic tissue. The bacterium was detected in the USA plant introduction collection several years before it appeared in commercial watermelon Webb and Goth, First subsp.citulli of infection of honeydew with Acidovorax avenae subsp.

Some of these transplants may harbour the bacterium, but show no symptoms. Plant seeds that have been tested for the presence of the fruit blotch bacterium. Plant Disease, 76 5: