Why monitor pepper pests and diseases regularly?

  • Pepper is easily attacked by pests and diseases because the vine grows close to the ground
  • Disease spreads silently from the base upwards; a garden can be lost if detected late
  • Most sensitive periods: after harvest – start of the rainy season – flowering

Early detection + early treatment = a protected garden + lower costs

5 common pests and diseases and how to manage them

1. Mealybugs – damage that goes unnoticed

  • Suck sap → the vine weakens
  • Cause sooty mould → black leaves, fruit drop
  • Multiply quickly in the dry season or in high humidity

Solution:

✅ Pilaravia 155SC – two-way systemic action

✅ Spray with Viet-up 90 for better adhesion and penetration

2. Root-knot nematodes

  • Cause swollen, rotting pepper roots → stunted vines that slowly die
  • Spread quickly through soil and irrigation water

Solution:

✅ Drench with a nematicide

✅ Stimulate new roots with Besviet 0.02SP for faster recovery

3. Phytophthora – quick wilt

  • Wilting leaves, black rotting vines
  • Spreads rapidly in the rainy season

Solution:

✅ Drench the base with Metalaxyl + copper-based products

✅ Improve drainage; do not let the base stay wet for long

4. Leaf-eating caterpillars and stem borers

  • Feed on leaves, young shoots and branches
  • Reduce photosynthetic area and fruit set

Solution:

✅ Spray biological products or the active ingredients emamectin, indoxacarb

✅ Rotate active ingredients to avoid resistance

5. Leaf yellowing and node drop

  • May be caused by nutrient deficiency or nematode – fungal disease
  • Leaves yellow from the bottom up; pepper nodes shrivel and drop

Solution:

✅ Apply additional potassium and magnesium

Integrated disease-prevention tips for pepper gardens

  • Prune to keep the canopy open
  • Do not let weeds cover the base
  • Fertilise in balance; avoid excess nitrogen
  • Stop spraying at least 21 days before harvest
  • Keep a spray record – avoid repeating the same active ingredient

Need technical advice on pepper pests and diseases?

Contact the Vietcropchem technical team: +84 86 210 5050

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[NEWS 16/10/2025]