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Stem borer: Insect damage


Pest: Coelosterna spinator and Zeuzera sp.


Symptoms

Holes made by grubs are seen on bark of main stems. Grubs feed internally on sapwood while adult beetles are active by the day and feed by gnawing the green bark of shoots.


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%).



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