Anthracnose – a silent but serious threat to the crop
Anthracnose is one of the most common diseases of crops in Vietnam and can be serious, especially in the rainy season or high humidity. It is caused by fungi of the genus Colletotrichum spp., which can enter quickly and spread widely through wind, rain, farm tools or plant residue.
Effects of anthracnose on crops
- Causes young shoot drop, leaf blight, stem cracking, branch dieback
- Fruit rots black, develops deep lesions, drops early
- Reduces yield and market value
- Can cause losses of 20–60% if not detected and treated in time
Symptoms of anthracnose by stage and plant part
| Infected part | Early signs | Progression | Common confusion |
|---|---|---|---|
| Young leaves | Small round light-brown spots | Spots spread with black margins – leaf blight | Confused with leaf scorch from micronutrient deficiency |
| Young/mature fruit | Slightly sunken black spots, usually at the stalk | Deep, slimy lesions spreading around the fruit – fruit drops | Confused with bacterial fruit rot |
| Branches/young shoots | Slight, slightly sunken scorching | Branches dry black, shoots die back | Confused with Botryodiplodia branch rot |
Crops commonly attacked by anthracnose
- Mango: young fruit with blackened stalks, mass drop
- Durian: young shoots die black, flowers scorch, fruit blackens in patches
- Coffee: early leaf drop, mottled black berries
- Pepper: young shoots fail to develop, flower drop
- Watermelon, chilli, tomato: fruit rot from flowering to harvest
Why is anthracnose hard to control with ordinary products?
- The fungus invades from internal tissue: contact products wash off easily and cannot reach the infection.
- Thrives in humid, rainy weather → conditions favour rapid spread.
- Survives in old wounds, fallen leaves and tree bases → recurs easily without hygiene and regular prevention.
✅ Recommended approach: Early prevention – use a broad-spectrum systemic product
To manage anthracnose effectively, specialists recommend:
- Pruning for an open canopy and regular orchard hygiene
- Balanced fertilisation, avoiding excess nitrogen
- Spraying a broad-spectrum fungicide with systemic action and a broad spectrum, for both prevention and treatment Read more: https://vietcropchem.com/tin_tuc/Tac-hai-cua-benh-than-thu-va-toc-do-lay-lan-nhanh-tren-cay-trong SEO keywords used in this article
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