IRISDD

Corynespora Leaf Spot

Pathogen: Corynespora cassiicola

Symptoms:

Exhibited a fishbone-like or railway necrosis with typical darkening of the veins with yellow borders surrounding the lesions. It will cause a leaf defoliation or leaf fall when the symptoms progress in the rubber leaves.

Control measures:
1. Proper drainage of the area planted.

2. Correct nutrition of the seedlings/trees.

3. Fungicide treatment by spraying the expanding leaves with either Vitigran blue, Daconil or Cupravit at the rate of 2g a.i./liter of water (10-11 tbsp/4 gal.) at least 4 rounds at weekly intervals.

Reference/s:

https://prri.da.gov.ph/wp-content/uploads/2019/07/Common-Diseases-of-Rubber-and-their-Management.pdf