AsaaseYaaCassava mosaic disease
A virus spread by whiteflies and infected stems. Leaves get yellow-green patches and twist.
What it looks like
Every field looks a little different. If you are not sure, ask in the app’s Farmers, or ask an agronomist.
When it comes
| Crop | Stage | Check |
|---|---|---|
| Cassava | Establishment | Scout weekly for first month |
| Cassava | Vegetative growth | Scout twice monthly |
What to look for
Once a week for the first month, look at the young cassava leaves. If they show yellow patches in odd patterns (mosaic), that's a virus called CMD — there's no cure, so remove and burn those plants right away. Always plant clean stem cuttings from healthy fields. Watch for termites near the cutting too.
Twice a month, check the tips of new shoots. White cottony patches on the stems mean mealybug — wash off with soapy water or treat. Tiny white flies that fly up when you shake the plant carry the mosaic virus from plant to plant — control them quickly. Pull up and burn any plants showing yellow patches.
What to do
Transmitted by whiteflies. The ultimate control measure is using CMD-resistant varieties certified by CSIR/CRI.
Also watch for
General advice from crop guides for Ghana. Before you spray, ask your agro-input dealer for a product registered for this pest, read the label, and wear gloves. For a serious attack, call your district agriculture office or an agronomist.
Catch it early
AsaaseYaa reminds you when to check your crop for pests, and shows you what to look for. Free.