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Anthracnose (Colletotrichum acutatum and C.gloeosporioides) favoured by hot weather and high humidity following rain. Asymptomatic infection of olive flowers from the early stage of flowering to fruit set.
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Both Colletotrichum acutatum and C. gloeosporioides species can occur in one olive grove and fungal isolates appear to be quite diverse.
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Spores of anthracnose fungus.
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Brown spots carrying sporulating colonies of anthracnose fungus on surface of leaves.
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Brown spots carrying sporulating colonies of anthracnose fungus on surface of leaves.
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Brown spots carrying sporulating colonies of anthracnose fungus on surface of leaves.
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The mummified olive fruits were observed when the fruit begin to ripen.
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Mummified olive fruit with spore mass of fungus.
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Symptoms of disease on green fruits.
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Fungus can be present, but dormant, in plant tissue and will become active when fruit begin to ripen.
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Spores can spread by dew, rain splash and moist wind to adjacent ripe and healthy fruit.
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Weather conditions before harvest very important for the development of disease on fruits.
