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PEST MANAGEMENT DECISION GUIDE: GREEN AND YELLOW LIST

Green aphids on peach

Myzus persicae (syn. Aphis vastator) سپږي in Pashto language
Afghanistan
  • Overfertilized trees with urea or nitrogen (N) attract aphids. Avoid applying more urea or N fertilizer than needed. Apply no more than once per tree per year. About 100gr N/ tree in the first year, 200gr N/ tree later years
  • Green peach aphids develop on hundreds of host plants (Broccoli, cabbage, carrot, cauliflower, potato, tomato, turnip and others) that may be avoided
  • Encourage the conservation of natural enemies. such as ladybugs, tiny parasitic wasps, hoverflies, or lacewings that naturally control aphids. Look for them when inspecting your plants and allow them to do their work. Avoid pesticides.
  • After finishing flowering, select trees randomly and count the number of shoots attacked by aphids. Also note the level of natural enemies
  • Monitor weekly
  • Inspect undersides of leaves for aphid colonies. For faster inspection, shake limbs over a cloth tray (“beating tray”) to find fallen aphids
  • Inspect plants for honeydew and sooty mould on leaves and watch out for ants moving up and down the tree from and to the aphids. Ants protect the aphids
  • Adult wingless aphids are oval pear-shaped, 1 to 2 mm. The young nymphs look similar to adults
  • Some aphids have transparent wings
  • Aphids are of variable colour: whitish green, pale yellow green, grey green, dark green, pink or reddish
  • Consider control measures at severe infestation (25-35% of infested shoots) and a low level of natural enemies. At many natural enemies, action may be not needed
  • Few placed yellow sticky traps are an easy way of monitoring parasitic wasps that naturally control aphids
  • Control action is too late when most leaves have heavily curled and became yellow with waxes on it.
  • Spray the trees with a strong jet of water to wash off aphids.
  • Spray affected plants with a mixture of soap and water. This washes off aphids and disturbs their breathing.12 The may need be repeated 2 to 3 times in weekly intervals.
  • Spray neem-based products and follow instruction on the label, spray 7-10 days interval when threshold is reached.
  • When using a pesticide or botanical, always wear PPE and follow the instruction on the product label.
  • Do not use chemicals with the same mode of action year after year as this can lead to resistance in aphids
  • Always consult the most recent list of registered pesticides of MAIL, Afghanistan
  • Spray crops with horticultural Oils (5 tablespoons of oil per gallon of water). (Soybean oil, Canola oil, Mineral Oil): Liquid concentrate
  • Both petroleum and vegetable- based products pose low acute toxicity risk to people, lifestock, wildlife and bees. Be careful when applying near ponds and waterway, horticultural oils are toxic to fish.
  • Spray imidacloprid-based products (e.g. Confidor, Killer EC, and others). Neonicotinoid insecticides, systemic. Follow instruction on the label, spray 7-10 days interval
  • WHO toxicity class II (Moderately acute hazardous to humans). Max 2 sprays / season if threshold is reached. 7-10 day intervals. Pre-harvest interval PHI 14 days. restricted re-entry interval REI 24hours. Eye and skin irritant. Toxic to bees; and to aquatic organisms. No use near waterways.
  • Spray crop with Deltamethrin products (e.g. Deltacanm, Dendol EC and others), Synthetic pyrethroids, contact action. Follow instruction on the label
  • WHO toxicity class II (Moderately acute hazardous to humans) , Max 2 sprays / season if threshold is reached.
AUTHOR(S): Matiullah Ahadi, Ministry of Agriculture and livestock (MAIL),email:matiullah.ahadi@hotmail.com

CREATED/UPDATED: June 2020
PRODUCED BY: Plantwise

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