Due to the impact of extreme climate in recent years, fungal diseases in durian orchards have been occurring more frequently. Taking precious durian trees as an example, controlling fungal invasion requires more effort and attention. During durian cultivation, leaf blight and stem canker often appear. To protect durian trees from these two diseases, Advansia has introduced two fungicides — Pencycuron and Dimethomorph — to help manage them effectively.

Suppressing the Development of Fungal Diseases

Pencycuron is a fungicide widely used for disease control in fruits and vegetables. Its main function is to suppress the development of fungal diseases, especially diseases caused by Rhizoctonia, such as leaf blight. Pencycuron works by inhibiting fungal cell membrane synthesis, achieving a fungicidal effect and preventing disease spread.

In durian cultivation, Pencycuron can effectively control some common fungal diseases, such as leaf blight. If this type of disease is not controlled, it can often cause large areas of leaves to turn dry, yellow, and fall, seriously affecting photosynthesis. This will slow down tree growth and reduce yield. Therefore, timely preventive spraying with Pencycuron is one of the important methods to protect durian trees from fungal disease damage.

Pencycuron 25WP is recommended at 20g mixed with 20 litres of water, applied once every two weeks to effectively prevent and control leaf blight.

Inhibiting Fungal Cell Wall Synthesis

As for Dimethomorph fungicide, it provides good control against certain plant pathogenic fungi. Its main function is to inhibit fungal cell wall synthesis, thereby suppressing fungal growth and reproduction.

In durian cultivation, Dimethomorph is commonly used to control stem canker. Stem canker is a common disease caused by oomycetes. If not controlled, it can invade the root area of fruit trees. The most obvious symptom is that the bark appears damaged, brown to black in colour, with gum exudation, similar to gummosis.

For durian trees affected by stem canker at the root area, dry branches can be clearly seen from the tree’s appearance. The whole tree often appears dehydrated because the root system has been damaged, causing the tree to be unable to absorb water and nutrients normally.

When the disease becomes severe, the root area may be invaded and damaged, eventually causing tree death. It can be considered one of the major threats to durian trees.

Dimethomorph 50WP is recommended for root drenching at 50g mixed with 10 litres of water. Farmers are advised to drench the tree roots once a month to prevent stem canker recurrence.