Stem borer: Affected tree
Pest: Coelosterna spinator and Zeuzera sp.
Symptoms
The grubs bore inside the trunk and feed on sapwood. Dry powdered material are usually seen near the base of plants.
Control
Treat the holes by injecting with fenvalerate 5ml/l or dichlorvos 10 ml /l and seal holes with clay.
Spray quinalphos (0.05%) or chlorpyrifos (0.05%).