Plantwise Factsheets for Farmers
Nurseries for clean Cassava planting material
Recognize the problem
material for cassava production needs to be obtained from healthy plants. This
means plants that show no symptoms of any disease: no leaf colour changes or chlorosis, no
twisted or curled leaves, no shoot tip dieback, no dark or white fungus
patches or streaks on the stem, no rotten spots and no other abnormal characteristics.
The most common
of these diseases are Cassava Brown Streak Virus and Cassava Mosaic Virus. Such
diseases can lead to up to 80-90% yield loss. Mealybug insects can also be a
establishment of nurseries for cassava planting material is necessary to
assure availability of disease free cassava cuttings. A cassava nursery is a small
cassava field aiming to produce clean cassava cuttings. Such plots are
established on a selected farmer plot. They are easily reached by other
farmers for sourcing planting materials and even for learning purposes. In
most cases, a plot of about 0.5 acres is well-manageable. It will provide
enough planting material for a 1 - 1.5 hectare field.
a site far away from other cassava fields at a distance of about 150 - 200m
to reduce the chance of insects carrying plant diseases to your nursery
a nursery site of about 20 x 20 metres
the land, and construct rows of ridges 30 cm apart
planting holes 8 - 10 cm deep, with 10 - 15 cm between them
cassava cuttings for planting material from healthy plants. Healthy plants
show no leaf colour changes or chlorosis, no shoot tip dieback, no dark or
white fungus patches or streaks on the stem and no rotten spots.
cassava cuttings while slightly slanted at 45°
the nursery site for cassava diseases and insect pests once per week, and
uproot diseased plants quickly
material should grow in the nursery for 3-4 months until it is ready for
planting into the field
transplant the healthiest looking plants into a field at a distance of 45cm
from plant to plant, and 60 cm between rows.
the nursery site from season to season to avoid soil-borne cassava diseases
The recommendations in this factsheet are relevant to:
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