Tuesday, 10 June 2014

Papaya Dieback Disease

Papaya (Carica papaya) dieback disease WITH NO EFFECTIVE CHEMICAL CONTROL

was discovered firstly in Java Island in 1913. Disease is caused by Erwinia papayae, which can survive in soil for 2 weeks as transient soil inhabitant and believed spread by human activity, birds or insects.

Symptoms:

1. Leaves
Water-soaked necrotic leaves from leaf tips to leaf vein.
Water soaked necrotic lesion
 
2. Shoot
Water-soaked lesions appear at the leaves stalk base and shoot, as well as the crown.
Advanced state of disease infection


3. Fruit
Started with sunken black spots which enlarges gradually.

Circular dark green lesion coalesces.




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