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PEST MANAGEMENT DECISION GUIDE: GREEN AND YELLOW LIST

Aphids on eggplant

Myzus persicae, Aphis gossypii
Ghana
  • Conserve natural enemies e.g. by avoiding broad spectrum insecticides
  • Cover plants with agro nets (size 400 μm mesh) to exclude the pest from crop
  • Grow plants with repellent effects on aphids (e.g. marigold, onions) as border/barrier crops
  • Use dry cow dung and green herb/ shrub leaves to make smoke, during early morning or late evening hours, which should be on the direction of wind to prevent pest from colonizing the crop
  • Apply well decomposed poultry manure (850 kg/ha) to ensure high plant vigour
  • Additional relevant crops: maize, cotton, okra
  • Begin monitoring at seedling stage, scout for attendant ants climbing up and down egg plant
  • Check keenly on plants for slow moving grey to blackish insects that are normally in colonies on underside of leaves as well as on soft new shoot tips or buds
  • Look for sticky, honeydew that is covered in a black sooty mould on lower foliage
  • Threshold: If 2-3 out of 20-30 plants have at least two aphid colonies, institute control measures
  • Spray the infested areas of a plant with a strong jet of water to wash aphids from plants
  • Spray both sides of the leaf with soapy water (1 ml/1 L water). Spray early in the morning or evening so that the spray does not dry quickly
  • Collect and release biocontrol products such as Aphidius spp., ladybirds, lacewings and parasitic wasps. Contact PPRSD for direction and assistance
  • Spray with botanical extracts e.g. mixture of garlic, neem, red chilli pepper and soap. Take 50 g mixture of equal quantities of each in 2 L of water, boil for 15 minutes, allow to cool, then spray during evening hours.
  • When using a pesticide or botanical, always wear protective clothing and follow the instructions on the product label.
  • Do not use chemicals with the same mode of action year after year as this can lead to resistance; always consult the most recent list of registered pesticides of MOFA, Ghana
  • Spray crop with Imidacloprid product (e.g. Confidor super, Consider super 200 SL) each at 10 ml/20 L of water. Systemic neonicotinoid (IRAC 4A)
  • WHO Class II (Moderately hazardous); Maximum number of treatments: twice per one season. PHI is 10 days; REI 24 hours. Highly toxic to bees and other non-target arthropods. Toxic to aquatic organisms. Avoid using near water ways.
  • Spray crop with Deltamethrin product (e.g. Deltacan, Decis 2.5 EC) each at 10-15 ml/20 L of water. Contact pyrethroid (IRAC 3A)
  • WHO Class II (Moderately hazardous); Maximum 3 applications per season in the morning or later in the day. PHI 5 days. REI 24 hours. Eye and skin irritant. Toxic to aquatic organisms. Avoid using near water ways; High risk to bees and other non-target arthropods. Don’t spray when plants are flowering
  • Spray with Emamectin benzoate (12 g/L) + Imidacloprid (50 g/L) insecticide (e.g. Dean 62 EC) at 15 ml/L of water. Emamectin is an avermectin, IRAC 6 + Imidacloprid, systemic neonicotinoid IRAC 4A
  • WHO Class II (Moderately hazardous); Maximum number of treatments: one per season. PHI is 10 days; REI 24 hours
AUTHOR(S): Nancy Murage (Ministry of Agriculture), Miriam Otipa (KARI), Dora Kilalo Dr. (Nairobi University), Alfayo Ombuya (KEPHIS), Willis Ochilo (CABI), Kenya. Modified for Ghana by: Benjamin K. Badii (University for Development Studies), Hannah Serwah-Nuamah (PPRSD, MOFA), Harunah Braimah (CSIR-CRI), Antony Cudjoe (Private Consultant), Maxwell Awuku (Chemico Ltd)

CREATED/UPDATED: May 2016
PRODUCED BY: Plantwise

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