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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The use of fungicides will reduce disease incidence when the applications are appropriately timed. Altrrnaria and Dispersal The fungus survives the winter in infected crop debris as mycelium and may also survive on the seed. Privacy policy Alternzria Bugwoodwiki Disclaimers. Temperatures of oF are optimal along with 8 hours continuous leaf wetness. Other parts of the plant are not directly affected.

Vegetable Disease and Their Control. Most fungicides used in disease management will suppress Alternaria leaf spot; however, chlorothalonil containing products are generally the most effective. Leaf blight was accompanied by powdery mildew.

Cucurbits, Alternaria Leaf Spot

The spots are light brown with a light center and form concentric dark rings as they enlarge, thus the cucumreina target spot. Another name for this disease is target leaf spot which refers to the appearance of the lesions on the upper surface of the leaves. Based on work by Michasia Harris and Bugwoodwiki user Jbrock.

Disease severity increases with periods of leaf wetness. Refer to the table below for some labeled fungicides. Alternaria cucumerina is an important pathogen of some CucumisCucurbita and Citrullus species with a wide distribution, including several European and Asian countries Ellis, Lesions are most often seen on leaves, but fruit spots have been reported. This page was last modified Amistar, Quadris boscalid day schedule. Dry pumpkin leaves affected by alternariosis Alternaria cucumerina and powdery mildew.


Alternaria cucumerina is a fungus of world-wide occurrence which can infect most cucurbits.

Plant Disease 76 Crops that are affected by this disease: Spores are readily wind-blown and splashed by rain. Lesions tend to appear first on the older leaves as small circular spots. High relative humidity is required for the production of conidia, akternaria will alternaaria spread by wing and rain.

Rotate with non-host crops for at least two years. Call or TDD in Maineorfor information on publications and program offerings from University of Maine Cooperative Extension, or visit extension. Some resistant varieties are available. Rotations cucuumerina exclude cucurbits for years may be beneficial. The observed leaf spots were up to mm in diameter with a round greyish to pale brown centre and dark brown edges.

The occurrence of alternaira disease in Georgia is sometimes sporadic but can be devastating if left unchecked. Department of Agriculture cooperating.

Alternaria leaf spot may cause reduced yield and smaller fruit. The infection may also begin at the blossom end with the entire fruit eventually turning brown and shriveling. For information about UMaine Extension programs and resources, visit extension.

Effect of Alternaria leaf blight on soluble solid content of muskmelon. In the picture above, A. Older leaves had a higher number of larger spots alhernaria younger leaves.

Control Remove crop refuse at the end of the season.

The genus Alternaria and allied hyphomycetes from the Russian Far East. No symptoms were observed on non-inoculated plants. Plant Disease 78 Defoliation exposes the fruit to sunscald which reduces fruit quality. Fruit may also be damaged due to exposure to the sun and wind.

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Alternaria leaf blight Alternaria cucumerina (Ellis & Everh.) J.A. Elliott

No responsibility is assumed for any problems associated with the use of products or services mentioned. John Wiley and Sons, New York. Introduction Alternaria cucumerina is a fungus of world-wide occurrence which can infect most cucurbits. In general, these measurements are within the size range determined by Simmons for A.

Cooperative Extension and other agencies of the U.

Provide adequate nutrition and appropriate growing conditions to reduce crop stress. Content is available for non-profit, educational use under our Copyright Agreement. 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. Avoid overhead irrigation, if possible. Rotate away from cucurbits for 1 to 2 years.

Alternaria cucumerina (Alternaria Leaf Blight of cucurbits)

See label for resistance guidelines. Zlternaria cucumerina Alternria cucumerina is most common on melons and watermelons, although it can affect most cucurbit crops. Periods of wet weather are necessary for abundant spore production. Defoliation, in turn, leads to a reduction in yield and may cause fruit to ripen prematurely.