What to do if Jackfruit trees are experiencing black heart, rust disease, and the fruit flesh is hard and not sweet?

These issues are likely caused by nutrient deficiencies, especially calcium and boron.

Recommended solution:

1. Soil Treatment: Apply 500g of Dolomite and 12.5kg of Mr Ganick Base Compost Extra per tree. This helps replenish calcium and improve soil organic matter.
2. Foliar Spray: Mix 20L water+ 40ml Mr Ganick CalMagBo+ + 40ml Mr Ganick VitaAll+ + 40ml Mr Ganick Organic K+. Spray evenly on the leaves every 7–10 days, for 3–4 consecutive rounds. Once the tree shows visible improvement, switch to spraying every 10–14 days for maintenance.

Mr Ganick CalMagBo+

Mr Ganick VitaAll+

Mr Ganick Organic K+

Mr Ganick Base Compost Extra