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PEST MANAGEMENT DECISION GUIDE: GREEN AND YELLOW LIST

Thrips in Tea

Scirtothrips kenyensis
Kenya
  • Plant seedlings which are free from thrips
  • Control broadleaf weeds and other alternative hosts in tea farms
  • Prune/pluck tea regularly to increase airflow and access by insecticides
  • Practice field hygiene to avoid contamination between farms
  • Shake leaves and/or flowers on a white piece of paper; check for thrips
  • Check for tiny slender cigar-shaped insects with fringed wings
  • Look out for silvery spots on the leaves and small brown patches of excretory droplets, typical of thrips infestation
  • Install yellow/blue sticky traps (10-15 traps/ha) at the crop canopy level for monitoring of thrips
  • Take action when 1-3 plants are infested
  • Remove and destroy heavily infested plants by burning or placing in black bags under the sun for 1-3 days to kill thrips
  • Spray with insecticidal soaps or oils such as neem or canola oil at 2-4 tablespoons per 4 liters of water
  • Spray every week with Beauveria bassiana Strain GHA (BotaniGard 22WP, Beavitech WP, Bio-power 1.15 WP).
  • Apply pesticides judiciously to conserve predatory mites and pirate bugs, etc which feed on thrips
  • Install yellow/blue sticky traps (10-15 traps/ha) at the crop canopy level for mass trapping of thrips
  • When using a pesticidel, 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 (PCPB)
  • Spray with Azadirachtin 1% @ 3 ml/l or 5% @ 1 ml/lts (like Achook 0.15% EC, Fortune AZA, Neemraj Super, Nembecidine EC, Ozoneem 1% EC etc)
  • WHO Class U Green Colour band; Product unlikely to present hazards under conditions of normal use
  • Spray deltamethrin 2.8% EC @ 0.3 ml/L or profenofos 50% EC @ 2 ml/lts in severe infestation
  • WHO Class II, moderately hazardous; yellow colour band. PHI 3 days
AUTHOR(S): Eunice Ringera (KEPHIS) and Miriam Otipa (KALRO)

CREATED/UPDATED: Dec 2018
PRODUCED BY: Plantwise

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