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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Acidovorax citrulli (fruit blotch)

There have been many other attempts to develop seed treatments for BFB. The characteristic symptom of bacterial subsp.citeulli blotch in watermelon is a dark, olive-green blotch on the upper surface of infected fruit that begins as a small, water-soaked area a few millimetres in diameter and rapidly enlarges to a lesion several centimetres in diameter with irregular margins Somodi et al.

A PCR method is highly sensitive and can be completed in 3 days Minsavage et al. Bacterial spot of fruits of melon and watermelon: In Australia, tests showed A.

Location of Acidovorax citrulli in infested watermelon seeds is influenced by the pathway of bacterial invasion. The watermelon seed industry is currently testing their seed lots by grow-out test of 10, to 50, seedlings per seed lot. A loopful of the suspension is streaked onto nutrient agar, King’s medium B agar and a Tween base agar, such as TC50 Frankle, Plant Disease Reporter, Bacteria from infested seed infect the developing seedling as the cotyledons emerge from the seed coat. The disease cycle in most host crops apparently begins with contaminated seed Latin and Hopkins, Watermelon fruits are most vulnerable to bacterial infection 2 to 3 weeks after anthesis Frankle et al.

Watermelon, cantaloupe and honeydew melons appear the most susceptible, with both foliar symptoms and blotch symptoms on the fruit Isakeit et al. Plant Disease, 98 Wet seed treatments for the control of bacterial fruit blotch of watermelon. Florida State Horticultural Society Proceedings, The data indicate that watermelon blossoms are a potential site of ingress for fruit and seed infestation by A.


Incidence There are very few reports of the incidence of A. Fitopatologia Brasileira, 30 3: Spread of the bacterium in the greenhouse can be minimized by low humidity, low temperatures, and bottom watering Hopkins, ; Latin et al.

Seed treatments with NaOCl at 50 o C for 20 min, peroxyacetic acid for 30 min and ACA at 50 o C for 20 min eradicated the pathogen, seed germination was negatively affected. Standard greenhouse sanitation practices should preclude perennation of the pathogen associated with plastic trays used for watermelon seedling production.

Bacterial fruit blotch of watermelon: Symptoms are produced on the foliage and fruit, and seed transmission occurs in this cucurbit weed, giving it the potential to serve as an alternate host to perpetuate the bacterium.

Symptomatic cotyledon, leaf, or rind tissue is triturated in sterile water. The American Phytopathological Society, St.

Many seed treatments have been reported to reduce BFB seedling transmission. Seed Science and Technology, 34 1: Volunteer cucurbits that grow from previous crops that had fruit blotch can be naturally infected with the bacterium. While fruit infection is initiated at anthesis, fruit symptoms do not develop until harvest acidovoorax. Datasheet Acidovorax citrulli fruit subsp.ctirulli. Other methods Methods of seed detection of A.

Plant Disease, 96 5: Wet seed treatment with peroxyacetic acid for the control of bacterial fruit blotch and other seedborne diseases of watermelon.

Transmission of the watermelon blotch bacterium from infested seed to seedlings. Acidovorax citrulli seed inoculum load affects seedling transmission and spread of bacterial fruit blotch of watermelon under greenhouse conditions.


Bacterial leaf spot of Christ’s thorn, a new disease caused by Acidovomx avenae subsp. Simplified detection of the pathogen of watermelon bacterial fruit blotch by using high density latex flocculation test. Once the wax layer forms, mature watermelons can be invaded by the bacterium only after wounding. First report of seedling blight of watermelon caused by Acidovorax citrulli transmitted from rootstock of pumpkin in China.

These aspects may have implications on bacterial survival in seed and efficiency of pathogen detection by seed health testing. The current preferred name for this pathogen is Acidovorax citrulli. Natural infection of citronmelon with Acidovorax avenae subsp.

In northern growing areas, fruit blotch affected fields should be planted subsequently with crops that utilize herbicides that will kill volunteer watermelons. Small, water-soaked lesions develop days later. First report of bacterial fruit blotch of watermelon in Oregon. Bacteria landing on uninfected seedlings penetrate cotyledons and leaves via stomata and multiply rapidly in intercellular space.

Chemical Control Applications of copper-containing fungicides at the full recommended rates have reduced the incidence of fruit blotch symptoms when applications were initiated prior to fruit set Hopkins, ; Hopkins, Initial symptoms of A.

EPPO Global Database

Natural outbreak of a bacterial fruit rot of cantaloupe in Georgia caused by Acidovorax avenae subsp. Diagnosis Top of page Symptomatic cotyledon, leaf, or rind tissue is triturated in sterile water. Occurrence of watermelon bacterial fruit blotch in Nagano prefecture.

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