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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Alternaria cucumerina is a fungus of world-wide occurrence which can infect most cucurbits. To our knowledge, this is the first documented detection of A.
Based on work by Michasia Harris and Bugwoodwiki user Jbrock.
Vegetable Disease and Their Control. Call or TDD in Maineorfor information on publications and program offerings from University of Maine Cooperative Extension, or visit extension. Dry pumpkin leaves affected by alternariosis Alternaria cucumerina and powdery mildew. New Disease Reports 23 The spots are light brown with a light center and form concentric dark rings as they enlarge, thus the name target spot.
Alternaria Leaf Spot cucumedina caused by Alternaria cucumerina and can cause serious damage under extended periods of wet weather.
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Plant Disease 78 Cooperative Extension and other agencies of the U. The plants were placed back in the greenhouse where brown spots were observed on aletrnaria plants three days post-inoculation. Mikologiya i Fitopatologiy 36 Lesions show the concentric rings that are characteristic of Alternaria infections.
Crops that are affected by this disease: The genus Alternaria and allied hyphomycetes from the Russian Far East. Lesions are most often seen on leaves, but fruit spots have been reported. In general, these measurements are within the size range determined by Simmons for A. Lesions which form on the lower leaf surface tend to be cucumerinq diffuse.
Fall plowing will bury the remaining debris and promote its breakdown. Initially yellow brown and small with a green to yellow halo, lesions expand into large, brown necrotic areas.
There are no resistant cultivars available. Periods of wet weather are necessary for abundant spore production. Refer to the table below for some labeled altednaria.
Fruit may also be damaged due to exposure to the sun and wind. Alternaroa or deep plow plant debris to speed decomposition. Mikologiya i Fitopatologiya 33 Defoliation, in turn, leads to a reduction in yield and may cause fruit to ripen prematurely. The occurrence of this disease in Georgia is sometimes sporadic but can be devastating if left unchecked. Another name for this disease is target leaf spot which refers to the appearance of the lesions on the upper surface of the leaves.
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. The use of fungicides will reduce disease incidence when the applications are appropriately timed. Fungal isolates with morphological characteristics similar to those of A. Rotations which exclude cucurbits for years may be beneficial.
Control Remove crop refuse at the end of the season. Control plants were sprayed only with water. No symptoms were observed on non-inoculated plants.
Lesions can coalesce and the leaves develop a cupped appearance and die. Lesions tend to appear first on the older leaves as small circular spots.
Plant Disease 76 The fungus survives the winter in infected crop debris as mycelium and may also survive on the seed. Alternnaria Egorova LN, It is prevalent in regions with abundant rainfall and high temperatures.