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Tuta absoluta (tomato leaf miner) on Tomato

Tuta absoluta
  • Plant clean seedlings free from infestation of the pest.
  • Rotate with non-host crops such as maize, beans and cabbages.
  • Rogue and destroy by burning all infected crop residues and wild host plants such as Sodom apple.
  • Clean all equipment used in transportation of tomatoes such as boxes, crates and trucks using soap and water.
  • Look out for:
    • Silvery brown adult moth.
    • Coalesced white to cream necrotic mines on both upper and lower parts of the leaf lamina.
    • Green larvae with black head inside the tunnels.
    • Silky web produced by the larvae to fold the leaf partially protecting older larval instars.
    • Blighted and necrotic leaves on plants due to infestation.
    • Puncture marks on fruit calyx with dried black frass at larvae exit hole and on stem.
  • Take action once you notice 1-3 moths or larvae per week.
  • Physically crush larvae by hand once signs of tunnelling are observed.
  • Mass trap with pheromone water traps (e.g. Pherodis at 4 packets per acre supplied by Koppert Biological Systems Kenya, Tutrack found at Kenya Biologics) to capture and kill adult moths.
  • Bury infested fruits and foliage 50-100 cm deep to destroy any larvae present.
  • Use of fungicides (e.g. Metarhizium anisopliae and Beauveria bassiana) to control eggs, larvae and adult infestations on crops.
  • Use black sticky traps (at 24 pieces/acre supplied by Koppert Biological Systems) placed at 15-20 cm above the ground to capture the adults.
  • Use screen vents in roofs and on the sides of the greenhouse to reduce insect pest migration.
  • Always wear protective clothing when handling agrochemicals.
  • Follow the instructions on the product label, such as dosage, timing of application, pre-harvest interval, maximum number of sprays, restricted re-entry interval. Do not empty into drains.
  • WHO class II pesticides might not be allowed in local IPM schemes.
  • Always consult recent list of registered pesticides (PCPB).
  • The pest is still new in the country and trials on pesticides are still ongoing.
  • Spinetoram (Radiant 120 SC at the rate of 180-300 mls/acre or 18-30mls/20L water).
  • WHO Class III, Blue colour band (Slightly hazardous), PHI 3 days.
  • Chlorantraniliprole (Coragen 20 SC at a rate of 5ml in 20L of water).
  • WHO class U, Green colour band (Unlikely to present acute hazard in normal use), MRL 0.05 Mg/Kg, PHI 3 days.
  • Flubendiamide (Belt 480SC at a rate of 4 mls per 20L).
  • WHO Class II, Yellow colour band (Moderately hazardous), PHI 3 days.
AUTHOR(S): Miriam Otipa (KALRO), Paul Kiige (MOALF), Eunice Ringera (KEPHIS), Philip Wendot (UON) and Benson Masinde (MOA), Peninah Munyao (MOALF), Judith Oyoo (KALRO), Wilson Nabakwe (MOALF)

PRODUCED BY: Plantwise

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