Mahali / kolerogo/ fruit rot: Phytophthora arecae
Symptoms:
- Rotting and excessive shedding of immature nuts from the trees.
- The water soaked spots initially develop at the base of the nut. Fruit stalks and rachis of inflorescence are also affected.
- Nuts show large vacuoles and dark brown radial strands.
- Very often the top of the affected trees dries up resulting in withering of leaves and bunches.
- Affected nuts fall off and show the white mycelial growth of the fungus.
Management:
- Clean cultivation
- Destruction of affected trees.
- Collection and burning of fallen nuts.
- Spray with Bordeaux mixture 1% before on set of the monsoon and second spray 40-45.
Image Source:
http://www.kissankerala.net:8080/KISSAN-CHDSS/English/index1.html
| Shedding of immature nuts | Dark brown radial strands | Withering of leaves | White mycelial growth |