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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Alternria cucumerina is most common on melons and watermelons, although it can affect most cucurbit crops.
Alternaria cucumerina (Alternaria Leaf Blight of cucurbits)
To our knowledge, this is the first documented detection of A. Direct infection is primarily of the leaves and can lead to defoliation. Most fungicides used in disease management will suppress Alternaria leaf spot; however, chlorothalonil containing products are generally the most effective.
Conidia spread by wind and rain splash produce secondary cycles of infection whenever conditions are favorable for disease development.
Cooperative Extension and other agencies of the U. Discussion View source History. The overwintering fungus serves as the source of primary infections and spores from these infections cycle the disease through the growing season. Retrieved from ” http: Lesions show the concentric rings that are characteristic of Alternaria infections.
Retrieved January 30,from http: Avoid overhead irrigation, if possible.
This page was last modified Remove or deep plow plant debris to speed decomposition. Some resistant varieties are available. Modeling the relationship between Alternaria leaf blight and yield loss in muskmelon. The genus Alternaria and allied hyphomycetes from the Russian Far East. The occurrence of this disease in Georgia is sometimes sporadic but can be devastating if left unchecked. Leaf blight was accompanied by powdery mildew. Plant Disease 76 Department of Agriculture cooperating.
Rotate with non-host crops for at least two years. Symptoms Another name for this disease is target leaf spot which refers to the appearance of the lesions on the upper surface of the leaves.
North American Amphibian Monitoring Program.
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Control plants were sprayed only with water.
Vegetable: Cucurbits, Alternaria Leaf Spot | UMass Center for Agriculture, Food and the Environment
Rotations which exclude cucurbits for years may atlernaria beneficial. Provide adequate nutrition and appropriate growing conditions to reduce crop stress. Reduce relative humidity in greenhouse operations. Other parts of the plant are not directly affected. There are no resistant cultivars available. Introduction Alternaria cucumerina is a wlternaria of world-wide occurrence which can infect most cucurbits.
John Wiley and Sons, New York. Dry pumpkin leaves affected by alternariosis Alternaria cucumerina and powdery mildew. 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. Environmental Conditions Infection by A. Fruit infections alyernaria as sunken brown spots and may later develop a dark powdery appearance as the fungus sporulates.
The plants were placed back in the greenhouse where brown spots were observed on all plants three days post-inoculation. They enlarge and contain concentric rings and are surrounded by a yellow halo. Especially important are periods of leaf wetness which allow spores enough time to germinate and penetrate the leaf cuticle. No responsibility is assumed for any problems associated with the use of products or services chcumerina.
UMaine Cooperative Extension: Insect Pests, Ticks and Plant Diseases
After seven days, alternaia solitary conidia were formed on the surface of the agar. Find more of our publications and books at extensionpubs. Lesions are most often seen on leaves, but fruit spots have been reported.