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
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