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PEST MANAGEMENT DECISION GUIDE: GREEN AND YELLOW LIST

African Cassava Mosaic Disease (ACMD)

Cassava Mosaic Virus Khate la chinangwa
Malawi
  • 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)

CREATED/UPDATED: June, 2016
PRODUCED BY: Plantwise

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