The grub and mature African red mite suck the nutrients from the leaf, upper side and lower side, so it turns pale green. The surface of lower side has the mark of the red mite which looks like dust. Finally, it would fall. It affects durian flowering and fruitage.
Entomopathogenic Fungi in the soil ruin the leaf near the ground surface first and spread to the nearby leaf and branch by wind and rain. It widely spreads during rainy season and in the unattended garden
Entomopathogenic Fungi widely spread in the humid climate. In the serious case, the leaf losses the photosynthesize area and finally falls off. Entomopathogenic Fungi on the leaf flow in the air along with drizzle.
In a lush and humid garden with less care, the leaf will be covered with rust colored algae. Algae suck the nutrient from the leaf which reduces the photosynthesis. Consequently, the tree gives low quality yields. Epiphytotic occurs throughout the year, particularly in high humidity area, particularly during rainy season.
Entomopathogenic Fungi is on the branch and trunk which makes them, and the bark decay. With high rainfall and humidity, fungi grow rapidly which can be evidenced by the newly expanding pink fiber. Leaving it unattended, the leaf falls and the branch remains.