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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Fungicide treated disease-free seed may be helpful. Mikologiya i Fitopatologiy 36 Consult your local extension specialist or agent for recommendations relevant to your particular host and state.

See label for resistance guidelines. Management of any pathogen is often dependent upon both cultural and chemical options. For information about UMaine Extension programs and resources, visit extension. Content is available for non-profit, educational use under our Copyright Agreement. The plants were placed back in the greenhouse where brown spots were observed on all plants three days post-inoculation. Alternaria leaf spot may cause reduced yield and smaller fruit. Cooperative Extension and other agencies of the U.

Fruit infections begin as sunken brown spots and may later develop a dark powdery appearance as the fungus slternaria. Insect Pests, Ticks and Plant Diseases. Rotate with non-host crops for at least two years. No endorsement of products or companies is intended, nor is criticism of unnamed products or companies implied.

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Plant Disease 78 The spots start as small, necrotic cucumedina. Refer to the table below for some labeled fungicides.

Spores are readily wind-blown and splashed by rain. North American Amphibian Monitoring Program.

Alternaria cucumerina

The occurrence of this disease in Georgia is sometimes sporadic but can be devastating if left unchecked. Other parts of the plant are not directly affected. Common Names and Diseases. 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. Direct infection is primarily of the leaves and can lead to defoliation.

No symptoms were observed on non-inoculated plants. Retrieved January 30,ccumerina http: Alternaria Leaf Spot is caused by Alternaria cucumerina and can cause serious damage under extended periods of wet weather. Mikologiya i Fitopatologiya 33 Alternaria cucumerina Alternria cucumerina is most common on melons and watermelons, although it can affect most cucurbit crops.

Reduce relative humidity in greenhouse operations.

After seven days, large solitary conidia were formed on the surface of the agar. An indirect effect is seen the fruit production. In general, these measurements are within the size range determined by Simmons for A.

Older leaves had a higher number of larger spots than younger leaves. The source of the disease is considered to be dormant mycelium in cucurbit fields and airborne conidia. Call or TDD in Maineorfor information on publications and program offerings from University of Maine Cooperative Extension, or visit extension. High relative humidity is required for the production of conidia, which will be spread by wing and rain.

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Leaf spots first appear on the older leaves in the middle and upper part of the plant. The genus Alternaria and allied hyphomycetes from the Russian Far East.

Direct infection of the fruit also occurs especially melons but much less frequently.

Alternaria cucumerina (Alternaria Leaf Blight of cucurbits) – Bugwoodwiki

References Egorova LN, Lesions are most often seen on leaves, but fruit spots have been reported. They enlarge and contain concentric rings and are surrounded by a yellow halo. Information in this publication is provided purely for educational purposes.

Especially important are periods of leaf wetness which allow spores enough time to germinate and penetrate the leaf cuticle.

Retrieved from ” http: Fungal isolates with morphological characteristics similar to those of A. Some resistant varieties are available. New Disease Reports 23 Vegetable Disease alternzria Their Control.

The overwintering fungus serves as the source of primary infections and spores from these infections cycle the disease through the growing season. Discussion View source History. Fungicides For Alternaria Control. Back to top Cucurbits, Alternaria Leaf Spot.

Alternaria cucumerina (Alternaria Leaf Blight of cucurbits)

Avoid overhead irrigation, if possible. Find more of our publications and books at extensionpubs. Temperatures of oF are optimal along with 8 hours continuous leaf wetness.