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Cucumber Gummosis


Cucumber Gummosis

Usually appear in

Spring to Summer

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Caused By:-     The Fungus Cladosporium cucumerinum


This disease is sometimes called Cucumber Scab. Discrete sunken grey to black spots usually with a mass of dense furry fungal growth appear on the fruit which may split. The stems and leaves may also be affected. At first, a sticky substance is exuded in drops as if the trouble were the result of an insect puncture. Spots then gradually turn gray then black and become sunken. It gradually enlarge enlarge to about 10mm in diameter. The tissue collapses farther into the cucumber until a pronounced cavity forms, lined with a dark green, velvety layer of the fruiting fungus. The first symptom on foliage is the appearance of numerous slightly water-soaked, paler green area. Gradually they turn gray to white and become angular, often with yellow margins. The fine vein in the spots may remain brown or tan and are distinct against the white background. The dead tissue cracks, breaking away until the whole leaf has a ragged appearance. Picture from Wikimedia Commons.


Spraying with a suitable fungicide is possible combined with a 2- to 3-year rotation with non-cucumber related crops. With some plants there are resistant varieties. Infected debris should be burnt.

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