Understanding and Managing Mango Scab: A Threat to Fruit Quality and Tree Health

Mango scab, caused by the fungus Elsinoë mangiferae, is a significant disease that poses a serious threat to mango trees. This fungal infection primarily targets young fruits, flowers, and foliage, leading to the formation of scaly lesions that can drastically reduce the quality of the fruit. The disease is most commonly identified by the appearance of small, black lesions on young mango fruits and brown to grey lesions on leaves. These lesions often cause the leaves to become crinkled and deformed, hampering the tree's overall growth.

In severe cases, the infection can lead to the premature dropping of fruits, while those that remain on the tree often develop unsightly scar tissues, making them unmarketable. The economic impact of mango scab is significant, particularly in regions where mango cultivation is a major agricultural activity. The fungus thrives in wet, humid conditions, particularly in swampy, low-lying orchards. It spreads through rain splash or wind, making it difficult to control, especially during the rainy season.

Managing mango scab requires a combination of preventive and chemical strategies. Preventive measures include pruning infected stems and removing dead tissues to reduce the levels of inoculum, thereby lowering the risk of disease spread. Chemical control, particularly with copper-based fungicides, has proven effective. These fungicides should be applied from the flower bud emergence stage to the flowering stage at two to three-week intervals for optimal results.

Differentiating mango scab from anthracnose, another common fungal disease, is essential for proper management. While both diseases cause lesions, the raised structures in scab lesions are a distinguishing feature. Effective management of mango scab is crucial for maintaining the health and productivity of mango trees, ensuring high-quality fruit production, and safeguarding the livelihoods of those dependent on mango cultivation.
Understanding and Managing Mango Scab: A Threat to Fruit Quality and Tree Health