Pests and Diseases Viewer




Usually appear in

Spring to Autumn.

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Caused By:-     Various Colletotrichum Fungi Species


Grape Anthracnose. Picture from Wikimedia Commons.
Anthracnose is a term given to plant diseases caused by fungi in the genus Colletotrichum which attacks many plants from grass, vegetables, fruits, and trees. Symptoms include small, elliptical black abnormal injury, less than 5 mm in diameter that develop circular, straw-coloured centres with wide margins that may vary in colour from reddish-black to purple. if it girdles the stem there is die back of the branch. On fruits such as melons and peppers the infected area is watersoaked, sunken and black spores develop on the rotting surfaces. Anthracnose disease attacks all plant parts at any growth stage. The symptoms are most visible on leaves and ripe fruits. This fungi attack numerous hardwood species, including Ash, Birch, Catalpa, Elm, Hickory, Horse Chestnut, London Planetree, Maple, Oak, Sycamore, Tuliptree, and Walnut. This plant disease is mainly of warm humid areas, but in the late 1970s a new form of the disease, which is known as dogwood anthracnose, was identified in North America. Unlike other forms of anthracnose, it thrives in cool climates.


The best way to prevent infection by anthracnose disease is approaching the problem with a broad set of strategies. First, good plant husbandry in collecting fallen plant debris and proper soil conditions as healthy plants are less likely to be attacked. Water plants at the roots where possible. Also, the bacteria Bacillis subtilis has been known to control the presence of anthracnose. Finally, the use of copper-based fungicides can be used to prevent the appearance of anthracnose.

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