January 27, 2021   |   by admin

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 cuucumerina fungicides will reduce disease incidence when the applications are appropriately timed. The source of the disease is considered to be dormant mycelium in cucurbit fields and airborne conidia.

Consult your local extension specialist or agent for recommendations relevant to your particular host and state. Young plants and old plants are more susceptible than are mid-season plants.

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

Insect Pests, Ticks and Plant Diseases. Alternaria leaf spot may cause reduced yield and smaller fruit. Symptoms Another cucumerin for this disease is target leaf spot which refers to the appearance of the lesions on the upper surface of the leaves.

Retrieved from ” http: Spores are readily wind-blown and splashed by rain. Mikologiya i Fitopatologiy 36 Fruit may also be damaged due to exposure to the sun and wind. Alternaria cucumerina is a fungus of world-wide occurrence which can infect most cucurbits. Plant Disease 78 Back to top Cucurbits, Alternaria Leaf Spot. Lesions can coalesce and the leaves develop a cupped appearance and die.


Older leaves had a higher number of larger spots than younger leaves. Amistar, Quadris boscalid day schedule. Survival and Dispersal The fungus survives the winter in infected crop debris as mycelium and may also survive alfernaria the seed. Retrieved January 30,from http: Direct infection is primarily of the leaves and can lead to defoliation.

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Alternaria cucumerina

Fruit infections begin as sunken brown spots and may later develop a dark powdery appearance as the fungus sporulates. Environmental Conditions Infection by A. The spots start as small, necrotic flecks. Fungal isolates with morphological characteristics similar to those of A. Altrenaria i Fitopatologiya 33 Periods of wet weather are necessary for abundant spore production.

Other parts of the plant are not directly affected. Department of Agriculture cooperating. North American Amphibian Monitoring Program. Control plants were sprayed only with water. Leaf spots first appear on the older leaves in the middle and upper part of the plant. Initially yellow brown and small with a green to yellow halo, lesions expand into large, brown necrotic areas.

The observed leaf spots were up to mm in diameter with a round greyish to pale brown centre and dark brown edges. Remove or deep plow plant debris to speed decomposition. Cooperative Extension and other agencies of the U.


The University of Maine Orono, Maine Remove plant debris at the end of the season and deep turn soil to bury remaining plant debris.

Alternaria cucumerina Alternria cucumerina is most common on melons and watermelons, although it can affect most cucurbit cuxumerina. Effect of Alternaria leaf blight on soluble solid content of muskmelon. Information in this publication is provided purely for educational purposes. Leaf blight was ckcumerina by powdery mildew. An indirect effect is seen the fruit production.

The interactions of Bipolaris sorokiniana strains and wheat samples. Rotate away from cucurbits for 1 to 2 years. Common Names and Diseases. Disease severity increases with periods of leaf wetness.

See label for resistance guidelines. Fall plowing will bury the remaining debris and promote its breakdown.

Refer to the table below for some labeled fungicides. Fungicide treated disease-free seed may be helpful. 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.

Rotate with non-host crops for at least two years. Crops that are affected by this disease: