Alternaria cucumerina. Rui map Zheng. Alternaria leaf blight. Alternaria cucumerina. Gerald Holmes. Alternaria leaf blight. Alternaria cucumerina. Gerald Holmes. Alternaria cucumerina is an important pathogen of some Cucumis, Cucurbita and Citrullus species with a wide distribution, including several. Alternaria leaf spot or blight of cucurbits or vine crops is caused by the fungus Alternaria cucumerina. The disease is widespread and often damaging in.
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Plants which have been weakened by poor nutrition, adverse growing conditions, other diseases, or heavy fruit set are also more alernaria. Based on work by Michasia Harris and Bugwoodwiki user Jbrock.
Insect Pests, Ticks and Plant Diseases. No symptoms were observed on cucumeeina plants. Alternaria cucumerina is an important pathogen of some CucumisCucurbita and Citrullus species with a wide distribution, including several European and Asian countries Ellis, High relative humidity is required for the production of conidia, which will be spread by wing and rain. For information about UMaine Extension programs and resources, visit extension.
Especially important are periods of leaf wetness which allow spores enough time to germinate and penetrate the leaf altednaria. Retrieved January 30,from http: There are no resistant cultivars available.
North American Amphibian Monitoring Program. The spots start as small, necrotic flecks. John Wiley and Sons, New York.
Disease severity increases with periods of leaf wetness. After seven days, large solitary conidia were formed on the surface of the agar. Call or TDD in Maineorcucumeria information on publications and program offerings from University of Maine Cooperative Extension, or visit extension. Rotations which exclude cucurbits for years may be beneficial.
Vegetable: Cucurbits, Alternaria Leaf Spot | UMass Center for Agriculture, Food and the Environment
Direct infection is primarily of the leaves and can lead to defoliation. Effect of Alternaria leaf blight on soluble solid content of muskmelon.
The fungus survives the winter in infected crop debris as mycelium and may also survive on the seed. The overwintering fungus serves as the source of primary infections and spores from these infections cycle the disease through the growing season.
Cucumedina and Dispersal The fungus survives the winter in infected crop debris as mycelium and may also survive on the seed. Provide adequate nutrition and appropriate growing conditions to reduce crop stress.
Cucurbits, Alternaria Leaf Spot
New Disease Reports 23 Modeling the cucjmerina between Alternaria leaf blight and yield loss in muskmelon. Another name for this disease is target leaf spot which refers to the appearance of the lesions on the upper surface of the leaves.
Remove plant debris at the end of the season and deep turn soil to bury remaining plant debris. The occurrence of this disease in Georgia is sometimes sporadic but can be devastating if left unchecked. The fungus has been found in the Far East of Russia on Cucumis melo, Cucumis sativus and Citrullus lanatus Egorova, ; however it has not been reported from other areas of Russia.
The infection may also begin at the blossom end with the entire fruit eventually turning brown and shriveling. North American Aquatic Connectivity Collaborative.
They enlarge and contain concentric rings and are surrounded by a yellow halo.