Thanks Guanabanus. Never mind you have no experience with durian. Your experience in other crops can help. I am a retired man planting some tropical fruits mainly durian. Beside fungal diseases, this fruit has many other problems such as uneven ripening. Some fruits remain hard even after 2-3 days after dropping from tree. When the pulp is hard, not the normal tender soft,could it be due to over N or K. When seeing heavy leaf drop, I applied 1-2 kg of 15-5-20 per tree about 2 months after an thesis. The early clone like musang king takes only 90 days to mature.
I completely agree.
Just back from a trip to Davao, Mindanao island.
Apart from the cultivated ones, there are thousands of Marang, Mangosteen, Soursop and Durian trees growing beautifully without any care.
Soil in that area is of vulcanic origin, naturally rich not only in N, P and K but especially in Iron, Manganese, Zinc, Magnesium, Sulphur, MOlibdenum, Boron.....all these micronutrients make a HUGE difference....together with a neutral-slightly acidic pH....