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PEST MANAGEMENT DECISION GUIDE: GREEN LIST

Aphids on chilli and green pepper

Myzus persicae Green peach aphid, peach-potato aphid
  • M. persicaeare small green aphids which feed on plant sap. These aphids can transmit plant viruses.
  • Use of repellant plants such as onion, garlic and marigold in alternate rows to crop.
  • Use of agro nets (size 400 µm) to prevent pest accessing crop seedlings, and remove at flowering stage
  • Conserve natural enemies (e.g. ladybird beetles, hoverflies and parasitoid wasps) by avoiding use of broad spectrum insecticides and providing suitable habitat.
  • Avoid high levels of nitrogen in soil, as this causes plants to become succulent and attractive to aphids.
  • Remove and burn crop residues immediately after harvest.
  • Start monitoring from seedling stage, look at lower leaves, stems or growing points for soft bodies insects, found in clusters.
  • Check underside of leaves, shoots and stems for immobile aphids.
  • Look for yellowing leaves, stunted growth and honeydew on infested crops. Sooty mould may grown on the honeydew.
  • Look for curled, wrinkled or cupped leaves and mosaic patterns on the leaves (alternating dark and light patches) - these are symptoms of viruses that can be transmitted by the aphid
  • Monitor at least 3 times a week for aphids early in the morning/late in day during dry periods.
  • Start control measures when there is 10-20% infestation (i.e. 1-2 infested plants/10-20 plants in plots).
  • Remove and burn infested plants to help reduce population spread.
  • Use yellow traps (at 2 traps per 30 m2 to attract and kill aphids.
  • Spray soap solution (potassium soaps e.g. Alata samina). Add 10-15 tablespoons of liquid soal in 16 L knapsack and spray foliage.
  • Spray with neem-based products and follow label instructions (e.g. Azatrol, 1.2% Azadiractin. 1 part Azatrol with 1 part water, spray at 7-10 day intervals).

CREATED/UPDATED: April 2018
PRODUCED BY: Plantwise

©CAB International. Published under a CC-BY-SA 4.0 licence.