PEST MANAGEMENT DECISION GUIDE: GREEN AND YELLOW LIST
Tuta absoluta (tomato leaf miner) on Tomato
- 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.
CREATED/UPDATED: October 2018
PRODUCED BY: Plantwise
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