Plantwise Factsheets for Farmers
Potato Fusarium Wilt
Fusarium oxysporum,, Fusarium avenaceum,, Fusarium solani
Recognize the problem
Affected plants wilt, resulting in
drooping leaves and soft stems, while healthy plants next to them remain rigid.
Affected plants grow more slowly, and their leaves are rolled and yellow. Below
the soil, the plant becomes discoloured and the tubers develop a brown ring
inside and become sunken at the stem end. The stems of diseased plants blacken
from belowground to aboveground.
The disease usually enters the plant through roots when temperatures
are greater than 20°C, but can also enter through wounds in the tuber or stem of
the plant. The problem will remain in the field if you continue to grow
potatoes in the coming seasons. If plants show wilting at or before flowering,
few tubers will form. The disease occurs when the potato plant is young.
Disease will be less likely if the plant is strong and healthy, such as when the
farmer is using fertiliser.
healthy tubers by sorting
- Use a
balanced fertiliser (NPK 100:50:50kg/acre)
- In dry
soil, it’s better to irrigate before planting to maintain proper moisture
adequate moisture at other times, especially as the crop matures, to avoid
vines and tubers should be destroyed by tilling
crop rotation with cereals, grasses, and forages for 2-3 years
When using a pesticide, always wear protective clothing and follow the instructions on the product label, such as dosage, timing of application, and pre-harvest interval.
The recommendations in this factsheet are relevant to:
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