Pests and Diseases Viewer

Gloeospporium Fruit Rot



P_gloeosporiumfrot

Gloeospporium Fruit Rot

Usually appear in

Autumn to Spring


Back to Pests and Diseases


Caused By:-     The Fungus Glomerella cingulata

Description

Glomerella, or bitter rot, is a fungal disease which occurs on many fruit throughout the world. It is often referred to as a ‘summer rot’. It is caused by the Glomerella cingulata fungus which is the sexual stage of this fungus while the asexual stage is called Colletotrichum gloeosporioides. it is also known as Pezicula alba. Although it attacks a wide range of fruits it is a great pest of apples in storage. Early in the season, the symptoms are small grey-brown flecks on the skin of the apples. As the fruit ages Glomerella appears as circular, firm, light brown spots which may be slightly sunken. As the infected areas develops and increase in size it spreads towards the core they eventually the surface turn dark brown-black within a few days. A cross section of the fruit shows the infected tissue as a V-shape from the skin to the core. This pattern differs from Bot rot which forms a cylindrical roting pattern extending to the core. Eventually the whole fruit will rot and secondary infections may add to the decay. It is not often seen on leaves, but when it does, it appears as small reddish spots(0.5-1.5mm wide) which gradually turn brown. Each fruit can have one to many infections. As the infection continue to develop to about 25mm in diameter, small raised asexual fruiting bodies form near the center and are often arranged in concentric circular patterns. The fungus overwinters in mummified fruit and also in cracks and crevices in bark and are dispersed by insects rain or wind.


Control

Warm, wet, humid conditions are ideal for the Glomerella fungus. Prompt chilling and storage will help prevent its occurrence, but vigilance is necessary as it does spreads rapidly to other stored fruits. Spraying at the correct time is more likely to prevent this fungus. For organic producers dipping the fruit in hot water at about 50 degrees centigrade for up to three minutes does not damages the fruits, but will help to prevent this pest.



Back to top