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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Cucurbits, Alternaria Leaf Spot

cucukerina 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.

In the picture above, A. Lesions are most often seen on leaves, but fruit spots have been reported. Symptoms first appear on older leaves near the crown.

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Initially yellow brown and small with a green to yellow halo, lesions expand into large, brown necrotic areas. Lesions show the concentric rings that are characteristic of Alternaria infections.

The source of the disease is considered to be dormant mycelium in cucurbit fields and airborne conidia. 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. Lesions can coalesce and the leaves develop a cupped appearance allternaria die.

Alternaria cucumerina (Alternaria Leaf Blight of cucurbits) – Bugwoodwiki

Defoliation exposes the fruit to sunscald which reduces fruit quality. North American Amphibian Monitoring Program. North American Aquatic Connectivity Collaborative.

Back to top Cucurbits, Alternaria Leaf Spot. Alternaria cucumerina Alternria cucumerina is most common on melons and watermelons, although it can affect most cucurbit crops.

Rotate with non-host crops for at least two years. Remove or deep plow plant debris to speed decomposition.

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Alternaria cucumerina causing leaf spot of pumpkin newly reported in North Caucasus (Russia)

Maximize the distance between cucurbit fields to limit spread. Avoid overhead irrigation, if possible. Crops that are affected by this disease: