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 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


African Cassava Mosaic Disease (ACMD)

Cassava Mosaic Virus Khate la chinangwa
  • This viral disease is spread mainly through insected cuttings used as planting material and is also transmitted by whiteflies (Bemisia tabaci)
  • Planting material can look healthy but the disease can be present so plant certified disease free cuttings supplied by: Chitedze, Bvumbwe, and Lunyangwa research stations or use resistant varieties: Sauti, Sagonja komanso, Beatrice
  • Avoid mixing planting materials i.e. certified and non-certified planting materials
  • Sterilize tools used to prepare cuttings with fire
  • Practice crop rotation with maize or sweet potato every other growing season
  • Remove weeds to discourage habitat for the vectors
  • Intercrop with maize or cowpeas to repel whiteflies
  • Check the cassava plants weekly for symptoms as soon as the plants start to sprout
  • Look for yellow/white mottled spots on the leaves, wrinkled and deformed leaves, and the presence of small whiteflies on the leaves especially on the lower side of the leaf
  • Also look for yellowing and very tiny leaves, tiny stems, stunted growth and small tubers
  • Apply green direct controls as soon as disease symptoms are seen and yellow direct controls when whiteflies are present
  • Uproot all infested plants once they are observed from the field/garden. Dry and burn far from the field (100m)
  • Use personal protective equipment when handling and applying pesticides, follow the label recommendations. Do not eat, drink, smoke when mixing or applying pesticides.
  • Do not apply insecticides in areas where cassava leaves are harvested for food
  • Using insecticides to manage insect vectors of ACMD is not advised for small-scale farmers, it is usually ineffective and not cost effective
  • For larger producers growing planting materials (cuttings) it might be advisable to use insecticide to manage white flies using the insecticides listed below
  • Apply cypermethrin 20g/L (Cypermethryn 20EC; Cyrux 20EC) at a rate of 5ml per 20L water. Contact and stomach acting pyrethroid. IRAC group: 3A
  • WHO II - Moderately hazardous. Apply when whiteflies are noticed. Very toxic to aquatic animals do not spray near water
  • Apply deltamethrin 25g/L (Decis EC; Deltamethrin EC) at a rate of 70ml per 100L water. Pyrethroid with contact and residual activity. IRAC group: 3A
  • WHO II - Moderately hazardous. Apply when whiteflies are noticed. Very toxic to aquatic animals do not spray near water
AUTHOR(S): Victor Zilahowa (Lilongwe University of Agriculture and Natural Resources) and Annie Zidana (Department of Crop Development in the Ministry of Agriculture)

PRODUCED BY: Plantwise

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