Troubleshooting
Monkey Jack problems — and how to fix them
Monkey Jack (Artocarpus lakoocha) is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Stem borers
Longhorn beetle larvae (Cerambycidae) tunnel into the trunk and main branches of mature trees, causing sawdust-like frass at entry holes and weakening structural limbs. Remove and destroy larvae manually with a wire probe; seal entry holes with a systemic insecticide paste in commercial orchards.
Fruit drop at immature stage
Irregular irrigation during the fruiting period or prolonged dry spells cause immature fruits to drop before maturity. Deep mulching and regular irrigation in the weeks following fruit set significantly reduce this problem.
Leaf rust and anthracnose
Fungal pathogens cause orange-brown pustules (rust) or dark, sunken lesions (anthracnose) on leaves and young shoots in humid, wet conditions. Improve air circulation around the canopy by pruning crossing branches; apply copper-based fungicide at the onset of wet season as a preventive measure.
Prevent monkey jack problems before they start
Most monkey jack issues are care-mismatch, not bad luck. Dial in the basics:
Monkey Jack problems — FAQ
Why is my monkey jack stem borers?
Longhorn beetle larvae (Cerambycidae) tunnel into the trunk and main branches of mature trees, causing sawdust-like frass at entry holes and weakening structural limbs. Remove and destroy larvae manually with a wire probe; seal entry holes with a systemic insecticide paste in commercial orchards.
Why is my monkey jack fruit drop at immature stage?
Irregular irrigation during the fruiting period or prolonged dry spells cause immature fruits to drop before maturity. Deep mulching and regular irrigation in the weeks following fruit set significantly reduce this problem.
Why is my monkey jack leaf rust and anthracnose?
Fungal pathogens cause orange-brown pustules (rust) or dark, sunken lesions (anthracnose) on leaves and young shoots in humid, wet conditions. Improve air circulation around the canopy by pruning crossing branches; apply copper-based fungicide at the onset of wet season as a preventive measure.