Cookies on Plantwise Knowledge Bank

Like most websites we use cookies. This is to ensure that we give you the best experience possible.

 

Continuing to use www.plantwise.org/KnowledgeBank means you agree to our use of cookies. If you would like to, you can learn more about the cookies we use.

Plantwise Knowledge Bank

Your search results

PEST MANAGEMENT DECISION GUIDE: GREEN AND YELLOW LIST

White flies on French beans

Bemisia tabaci and Trialeurodes vaporariorum Swahili: Inziweupe
Kenya
  • 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)

CREATED/UPDATED: October 2013
PRODUCED BY: Plantwise

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