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PEST MANAGEMENT DECISION GUIDE: GREEN AND YELLOW LIST

Leaf miner of tomato

Tuta absoluta Phephelu wodya mkati mwa tsamba la tomato
Malawi
  • Rotate tomato with non-solanaceous crops such as maize, sorghum, millet or cassava after every 2 years
  • Avoid planting tomatoes near alternative hosts such as pepper, eggplant and potatoes
  • Uproot and burn crop residues soon after harvest and plough the field to kill the larvae and pupae
  • Apply mulch on the ground to prevent pupae getting to the soil for further development
  • Plant Tephrosia hedge round the plot to repel leaf miners from the crop
  • Use pest free planting material. Obtain certified seed material, and for seedlings leave out those that show signs of infestation of leaf miner
  • Additional relevant crops: Solanacaeae family (potato, egg plant, peppers, nightshade)
  • Scout the field twice a week from transplanting to harvest
  • Check on seedlings in the nursery for tunnels and oviposition marks before transplanting in the field
  • Look for white puncture marks, shivelling, yellowing and tunnels or irregular mines on leaves caused by adult laying eggs on the leaves
  • Look out for green larvae with black head inside the tunnels but later turn to pinkish green
  • Look out for puncture marks on fruit calyx with dried black frass at larvae exit hole and on stem
  • Use pheromone traps to monitor the presence of adult moth which are thread like,silverish-grey with black spots on inner wings
  • Start direct control when high infestation of over 30% of leaf surface is observed
  • If 5-10 leaves with tunnels or larvae or adult moths are found /acre consider taking control action
  • Physically crush larvae by hand once sign of tunnelling is observed
  • Remove infested leaves and fruits before the larvae inside pupate and become egg-laying adults and bury them 50-100 cm deep.
  • Use pheromone traps (40-50 traps per ha) to mass trap adults
  • Apply neem seed extract solution. Usually soak 25-50 g neem in 1 litre cold water over night, sieve, add 15 litres water. Spray neem to the soil after ploughing to kill dormant larvae and pupae. 15 litres for 1.5 acre. Spray both upper and underside of leaves against young larvae, thus when first small feeding tunnels are observed or just after moths were observed
  • Use personal protective equipment when handling and applying pesticides, follow the label recommendations. Do not eat, drink, smoke when mixing or applying pesticides.
  • Apply Abamectin (Dynamec 018 EC/Vertimec 18 g/litre). Application rate is 10 ml in 16 litres of water.
  • WHO Class II Pre harvest interval 3 days Application interval of 7 to 10 days Very toxic to aquatic life.
  • Spray bifenthrin at a rate of 5 ml in 20 litres of water. Non-systemic with contact stomach action. Pyrethroid; IRAC 3A
  • WHO class II - Moderately hazardous. PHI 3 days.
  • Drench with imidacloprid (Confidor) at the recommended rates. Neonicotinoid, IRAC 4A. Systemic insecticide with translaminar activity and with contact and stomach action
  • WHO Class II - Moderately hazardous
AUTHOR(S): Tonny Maulana (Pesticide Control Board), Nixon Nyalugwe (DCD) and Francis Mwale (DAES)

CREATED/UPDATED: June 2016
PRODUCED BY: Plantwise

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