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 interactions of Bipolaris sorokiniana strains and wheat samples. Fungicides For Alternaria Control. The plants were placed back in the greenhouse where brown spots were observed on all plants three days post-inoculation. North American Amphibian Monitoring Program. Cooperative Extension and other agencies of the U. No endorsement of products or companies is intended, nor is criticism of unnamed products or companies implied.
Initially yellow brown and small with a green to yellow halo, lesions expand into large, brown necrotic areas. No symptoms were observed on non-inoculated plants. The infection may also begin at the blossom end with the entire fruit eventually turning brown and shriveling. The spots are light brown with a light center and form concentric dark rings as they enlarge, thus the name target spot.
Provide adequate nutrition and appropriate growing conditions to reduce crop stress.
UMaine Cooperative Extension: Insect Pests, Ticks and Plant Diseases
Fall plowing will bury the remaining debris and promote its breakdown. Alternaria Leaf Spot is caused by Alternaria cucumerina and can cause serious damage under extended periods of wet weather. Lesions which form on aletrnaria lower leaf surface tend to be more diffuse. They enlarge and contain concentric rings and are surrounded by a yellow halo.
Alternaria leaf blight Alternaria cucumerina (Ellis & Everh.) J.A. Elliott
Leaf spots first appear on the older leaves in the middle and upper part of the plant. John Wiley and Sons, New York. The fungus survives the winter in infected crop debris as mycelium and may also survive on the seed. Periods of wet weather are necessary for abundant spore production. Temperatures of oF are optimal along with 8 hours continuous leaf wetness.
Survival and Dispersal The fungus survives the winter in infected crop debris as mycelium and may also survive on the seed. 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 genus Alternaria and allied hyphomycetes from the Russian Far East. Call or TDD in Maineorfor information on publications and program offerings from University of Maine Cooperative Extension, or visit extension. Discussion View source History. Insect Pests, Ticks and Plant Diseases. Vegetable Disease and Their Control. Amistar, Quadris boscalid day schedule.
Rotate away from cucurbits for 1 to 2 years. Remove or deep plow plant debris to speed decomposition. Management of any pathogen is often dependent upon both cultural and chemical options. Consult your local extension specialist or agent for recommendations relevant to your particular host and state.
See label for resistance slternaria. Lesions show the concentric rings that are characteristic of Alternaria infections. Alternaria cucumerina is a fungus of world-wide occurrence which can infect most cucurbits. Lesions can coalesce and the leaves develop a cupped appearance and die.
Information in this publication is provided purely for educational purposes. Rotate with non-host crops for at least two years. Maximize the distance between cucurbit fields to limit spread.
The overwintering fungus serves as the source of primary infections and spores from these infections cycle the disease through the growing season. Retrieved January 30,from http: Effect of Alternaria leaf blight on soluble solid cucmuerina of muskmelon. Alternaria cucumerina is an important pathogen of some CucumisCucurbita and Citrullus species with a wide distribution, including several European and Asian countries Ellis, Alternaria leaf spot may cause reduced yield and smaller fruit.
Disease severity increases with periods of leaf wetness. Conidia spread by wind and rain splash produce secondary cycles of infection whenever conditions are favorable for disease development.
Rotations which exclude cucurbits for years may be beneficial. Plant Disease 76 New Disease Reports 23 ,