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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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.

UMaine Cooperative Extension: Insect Pests, Ticks and Plant Diseases

Reduce relative humidity in greenhouse operations. Insect Pests, Ticks and Plant Diseases. Especially important are periods of leaf wetness which allow spores enough time to germinate and penetrate the leaf cuticle. After seven days, large solitary conidia were formed on the surface of the agar. Control plants were sprayed cucymerina with water. Back to top Cucurbits, Alternaria Leaf Spot. Initially yellow brown and small with a green to yellow halo, lesions expand into large, brown necrotic areas.

Lesions tend to appear first on the older leaves as small circular spots. Symptoms first appear on older leaves near the crown. Mikologiya i Fitopatologiy 36 cucumeriina, Fruit infections begin as sunken brown spots and may later develop a dark powdery appearance as the fungus sporulates. The source of the disease is considered to be dormant mycelium in cucurbit fields and airborne conidia. Remove or deep plow plant debris to speed decomposition. Spores are cucujerina wind-blown and splashed by rain.


Periods of wet weather are necessary for abundant spore production.

Effect of Alternaria leaf blight on soluble solid content of muskmelon. This page was last modified Based on work by Michasia Harris and Bugwoodwiki user Jbrock. Other parts of the plant are not directly affected. Modeling the relationship between Alternaria leaf blight and yield loss in muskmelon. Cucumeerina i Fitopatologiya 33 Lesions are most often seen on leaves, but fruit spots have been reported.

The spots start as small, necrotic flecks. The spots are light brown with a light center cucumeina form concentric dark rings as they enlarge, thus the name target spot.

Alternaria cucumerina (Alternaria Leaf Blight of cucurbits) – Bugwoodwiki

John Wiley and Sons, New York. Some resistant varieties are available. Leaf blight was accompanied by powdery mildew. There are no resistant cultivars available. Remove plant debris at the end of the season and deep turn soil to bury remaining plant debris.

The University ccuumerina Maine Orono, Maine Alternaria leaf spot may cause reduced yield and smaller fruit. Maximize the distance between cucurbit fields to limit spread. High relative humidity is required for the production of conidia, which will be spread by wing and rain.

Provide adequate nutrition and appropriate growing conditions to reduce crop stress.

Alternaria cucumerina (Alternaria Leaf Blight of cucurbits)

Amistar, Quadris boscalid day schedule. Lesions can coalesce and the leaves develop a cupped appearance and die. Management of any pathogen is often dependent upon both cultural and chemical options. Alternria cucumerina is most common on melons and watermelons, although it can affect most cucurbit crops. It is prevalent in regions with abundant rainfall and high temperatures.


Vegetable: Cucurbits, Alternaria Leaf Spot | UMass Center for Agriculture, Food and the Environment

Conidia spread by wind and rain splash produce secondary cycles of infection whenever conditions are favorable for disease development. Disease severity increases with periods of leaf wetness. Alternaria cucumerina is an important pathogen of some CucumisCucurbita and Citrullus species with a wide distribution, including several European and Asian countries Ellis, North American Aquatic Connectivity Collaborative.

See label for resistance guidelines. Rotations which exclude cucurbits for years may be beneficial. No endorsement of products or companies is intended, nor is criticism of unnamed products or companies implied. 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 plants were placed back in the greenhouse where brown spots were observed on all plants three days post-inoculation. Cucujerina Conditions Infection by A.

Plant Disease 78 alternariaa, Retrieved from ” http: 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.