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Mycologia, ASCOMYCOTINA, POLYSTIGMATALES, PHYLLACORACEAE .
Identification, Description, Biology, Epidemiology, Treatement, Possible misleading, Images
[R]Description
Small depressions which become covered with acervuli and get a creamish brick red colour that turns into brownish afterwards. These depressions increase in size gradually in the fruits, spreading eventually to almost all the fruit surface, causing scorching.
Loss of the leaves near the fruits. The leaves at the end of the branches remain and form a tuft; diffuse brown spots (yellow at the beginning), limited by a dark zone, are seen on the leaves which become deformed and bend longitudinally forming a gutter.
[R]Biology
Primary infections have origin on the germination of spores from the acervuli on fruits, leaves and young shoots.
The critical period of attack occurs when the fruit colour changes and the referred favourable conditions are present.
The incidence of the disease may be increased by the attack of Dacus oleae .
[R]Epidemiology
The most favourable conditions for the fungus development are : temperature 25 °C. and RH (minimum 92 %).
The pustules that appear in the affected areas, formed by the conidia mixed with granulous plasma, are melted by the rain that spreads the conidia in the same tree or, together with the wind from tree to tree.
[R]Treatement
The treatments are mainly chemical with copper and organic fungicides (in Portugal, before autumn rains mid September-October).
Use of less susceptible and late-ripening cultivars.
Proper annual pruning to reduce inoculum and improve tree aeration.
HYP3 on line : Species (scientific name), Diseases (common names), Glossary, Crops.
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