Agriculture Reference
In-Depth Information
DIPLODIA FRUIT ROT
Source of infection and spread
The fungus survives and produces spores on leaves, dead
twigs, and in the mummified fruit on and under the tree.
These are spread by wind and rain. Humid conditions
favour disease development.
Cause
Lasiodiplodia theobromae .
Symptoms
In fruit, small black spots develop and expand rapidly to
become hard and cracked. External symptoms are very
similar to those of black canker. However, internal
discolouration and rotting extends well into the fruit, often
producing a dry, brown, corky appearance. Infected fruit
generally mummify and remain attached to the tree. The
fungus also causes a dieback of young twigs.
Importance
The disease is usually a problem only in neglected trees.
Management
Remove and destroy mummifi ed fruit and dead branches
before fruit set.
PINK DISEASE
Cause
The fungus Erythricium salmonicolor .
Fig 8.10 Diplodia fruit rot causes cracked, dark lesions extending
deep into the fruit tissue.
Fig 8.11 Invasive growth of Diplodia fruit rot.
Fig 8.12 Fungal growth of pink disease on a limb.
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