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White flies on French beans

Bemisia tabaci and Trialeurodes vaporariorum Swahili: Inziweupe
  • Keep the field free of weeds throughout the cropping season as they act as alternate hosts for whiteflies
  • Cover plants with agro nets (size 400 µm) to exclude the whiteflies from the crop
  • Plant repellent crops like coriander and Mexican marigold around the edge of the field to repel the white flies
  • Plant in well prepared fertile land to promote plant vigour
  • Conserve natural enemies (e.g. parasitic wasps) by avoiding chemical sprays during flowering
  • For early detection, look out for whitish- brown eggs and /or whitish adults on the underside of young leaves
  • Look for a cloud of over to 3-5 white insects that resettle soon after the plant is shaken
  • Check for yellowing symptoms on lower leaves of the plant
  • Start control measures as soon as the pests are observed on the crop
  • Mount yellow sticky traps to trap adults- 4 traps/300m2 at 50cm above the ground
  • Spray Azadirachtin 0.03% (50 ml/20L water) when symptoms appear
  • Spray with pepper at rate of 30 chopped peppers put in 1 litre warm water. Soak for 1 day, dilute in 10 L water
  • Alternate active ingredients to prevent development of resistance
  • Wear protective clothing
  • Spray early morning or late evening to avoid harming bees.
  • Read and follow instructions on the label
  • Dispose properly to avoid aquatic contamination
  • Drench with imidacloprid based products e.g. Confidor 200SL, Imax 200SL,and Tata Mida 200SL at a rate of 10mls in 20 litres of water. Neonicotinoid, IRAC 4A. Systemic insecticide with translaminar activity and with contact and stomach action
  • WHO Class II (Moderately hazardous). PHI 3 days
  • Spray lambda-cyhalothrin based products e.g. Karate 2.5WG at 20gms/20L of water and Duduthrin 1.7EC at 60ml/20Lof water
  • WHO class II (Moderately hazardous). PHI 3 days. Toxic to fish and aquatic invertebrates
  • Spray alpha-cypermethrin based products e.g. Bastox 100EC at 6ml/20L of water Tata Alpha 10EC at a rate of 6ml per 20 litres of water
  • WHO Class II(Moderately hazardous), PHI 3 days
AUTHOR(S): Stephen Kiritai (MoALF), K. Kagai (MoALF), Miriam Otipa (KALRO) and Benson Ngigi (MoALF), Dora Kilalo (University of Nairobi) Esther macharia (KALRO), Boniface N. Ndung’u (MoALF)

PRODUCED BY: Plantwise

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