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PEST MANAGEMENT DECISION GUIDE: GREEN AND YELLOW LIST

Aphids on cashew and citrus

Toxoptera aurantii, T. citricidus, Aphis spiraecola, Myzus persicae Nkokodwie
Ghana
  • Conserve natural enemy populations (ladybugs, parasitic wasps, hoverflies, lacewings and entomopathogenic fungi) by reducing use of pesticides, and encourage vegetative growth by growing cover crops such as Talinum triangulari (Bokoboko)
  • Do not use cashew cultivars that continuously produce new shoots (e.g. Hybrid cashew)
  • Keep the plantation free of weeds and alternative hosts such as avocado, mango, indian almond and wild mustards
  • Maintain good soil fertility to ensure high seedling vigour
  • Additional relevant crops: avocado, mango
  • Start monitoring from seedling stage and check plants weekly for adults and nymphs of aphids
  • Randomly select 5 trees in the field and count the number of shoots/plant attacked by aphids and note the level of natural enemies in a circle of 28 cm
  • Inspect plants for honeydew and sooty mould on leaves and watch out for ants movements up and down the tree
  • Consider control measures in cases of severe infestation (i.e. 30% of infested shoots) and a very low level of natural enemies
  • Prune branches of severely attacked plants with active growth over an extended period
  • Spray the infested areas of seedlings with a strong jet of water to wash off aphids and reduce their numbers
  • Spray soap solution (potassium soaps, e.g. alata samina) (add 10-15 tablespoons of liquid soap in 16 L Knapsack and spray on foliage).
  • When using a pesticide or botanical, always wear PPE 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-based product (e.g. Confidor Super, Consider super 200 SL) at 10ml/20L of water. These are Neonicotinoids (IRAC, 4A) with systemic action
  • WHO Class II (Moderately hazardous); Maximum 3 applications per season in the morning and later in the day. PHI 14 days. REI 24 hours. Eye and skin irritant. Highly toxic to bees and other non-target arthropods.Toxic to aquatic organisms. Avoid using near waterways.
  • Spray crop with Deltamethrin product e.g. Deltacan (at 10ml/20L of water), Decis 2.5 EC (at 15ml/20L of water). Sysnthetic pyrethroid (IRAC, 3A) with contact action
  • WHO Class II (Moderately hazardous); Maximum 3 applications per season in the morning and later in the day. PHI 14 days. REI 24 hours. Eye and skin irritant. Highly toxic to bees and other non target arthropods. Toxic to aquatic organisms. Avoid using near waterways.
  • Spray crop with Dimethoate + Cypermethrin product (e.g. Cydim EC, Cydim super EC, Cypasect 43.6 EC, Cymethoate super EC) at 250g/l. Dimethoate is an oganophosphate (IRAC 1B) Cypermethrin is a pyrethroid with contact action (IRAC, 3A)
  • WHO Class II (Moderately hazardous); Maximum 3 applications per season in the morning and later in the day. PHI 14 days. REI 24 hours. Eye and skin irritant. Highly toxic to bees and other non-target arthropods.Toxic to aquatic organisms. Avoid using near waterways.
AUTHOR(S): Benjamin K. Badii (University for Development Studies), Hannah Serwah-Nuamah (PPRSD, MOFA), Harunah Braimah (CSIR-CRI), Antony Cudjoe (CSIR-CRIG), Maxwell Awuku (Chemico Ltd)

CREATED/UPDATED: May 2016
PRODUCED BY: Plantwise

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