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PEST MANAGEMENT DECISION GUIDE: GREEN LIST

Aphids on eggplant

Myzus persicae, Aphis gossypii Green peach aphid; cotton aphid
  • M. persicaeare small aphids which feed on plant sap. These aphids can transmit plant viruses.
  • Cover plants with agro nets (400 µm mesh) to prevent pest access.
  • Grow aphid repellant plants (e.g. marigold and onions) as border/barrier of crop plots.
  • Burn dried cow dung and herb/shrub leaves to make smoke in early mornings or late evenings to prevent pest colonisation.
  • Apply poultry manure (850 kg/Ha) to ensure high plant vigour.
  • Conserve natural enemies by avoiding broad spectrum insecticides and providing suitable habitat.
  • Begin monitoring at seedling stage, observe for associated ants around crops.
  • Observe underside of leaves for grey-black or green aphid insects (normally found in colonies).
  • 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
  • If 2-3 out of 20-30 plants have at least 2 aphid colonies, undertake control measures.
  • Wash infested areas of plants with a strong jet of water.
  • Use soapy water (1 ml/2 L water) on both sides of leaves, spray during early mornings/late evenings so spray does not dry quickly.
  • Release biocontrol agents (e.g. Aphidius spp., ladybirds, lacewings and parasitic wasps). Release roughly 5-25 per 100 square ft., weekly in areas of high infestation.
  • 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.