Mealybugs – a silent threat damaging durian orchards
In recent years, mealybugs have become a serious pest of durian, especially in key growing areas such as Tiền Giang, Bến Tre and the Central Highlands. Besides causing flower drop, mealybugs also greatly affect fruit quality, and can cause total crop loss if not managed in time.
Identifying mealybugs on durian
| Feeding site | Specific symptoms |
|---|---|
| Flower stalks, young shoots | White cotton- or wax-like spots, shoots fail to open, dry out easily |
| Root collar, base | A white wax layer close to the base, many black ants |
| Young fruit stalks | Fruit drops early, stalks turn black and shrivel |
| Leaf undersides, leaf sheaths | Dull white, leaves fail to develop and curl |
Some growers initially confuse this with sooty mould or flower blight, use the wrong product, and the problem spreads faster.
Damage caused by mealybugs on durian
- Continuous sap sucking → young shoots and leaves become deformed – slow-growing
- Honeydew secretion → encourages sooty mould on leaves, reducing photosynthesis
- Mass young fruit drop, especially 7–10 days after flowering
- Hinders new flushes; trees lose vigour quickly and are prone to other fungal/bacterial diseases
If not managed in time, mealybugs can affect 30–50% of output, especially in the rainy season.
When do mealybugs break out?
- Early to mid rainy season (lunar months 4–8): high humidity, many young leaves
- After rain lasting 2–3 days
- When trees flower – set young fruit
- When heavy nitrogen is applied and trees flush continuously
✅ Preventing and managing mealybugs on durian
1. Inspect early and thoroughly
- Regularly check flower stalks, young shoots and leaf undersides
- Observe the base → many black ants is a clear sign of mealybugs
2. Spray a two-way systemic product
- Prefer products that penetrate and move within the plant, as mealybugs often hide deep in tissue
Product suggestion:
Pilaravia 155SC – two-way systemic - for mealybug control: https://vietcropchem.com/san_pham/PILARAVIA-155SC
3. Combine with a sticker adjuvant – better results
- Use Viet-up 90 at 10–15ml/25L tank to help the product adhere to waxy surfaces and resist wash-off in rain
4. Prune – clean the orchard – manage ants
- Prune dense branches for better ventilation
- Clear weeds at the base and control black ants to limit mealybug spread
Durian mealybug programme with Pilaravia 155SC
| Step | Detailed instructions |
|---|---|
| 1 | Mix 20–25ml Pilaravia 155SC + 15ml Viet-up 90 / 25L water |
| 2 | Spray evenly to wet from the base up to the canopy, focusing on shoots – flower stalks – fruit stalks |
| 3 | Repeat after 7 days if mealybug density is high |
| 4 | Check results after 3–5 days (mealybugs turn brown – dry out) |
Conclusion
Mealybugs on durian are a serious pest but can be controlled with early detection – the right product – the right technique. Combining Pilaravia 155SC and Viet-up 90 with sound orchard hygiene is key to helping growers protect the crop and support fruit yield.
Read next Mass fruit drop in mango? Don't ignore signs of mealybug attack
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