Divisi
Ratoon stunting disease
Leifsonia xyli subsp. xyli · Bacterial
Photo: Hyela, via Wikimedia Commons · CC BY-SA 4.0
Ratoon stunting disease is a bacterial disease of sugarcane. The bacteria live inside the cane's water pipes (the xylem, the fine tubes that carry water up the stalk) and block the flow of water, so the plant stays thin and short. It is spread almost entirely through infected seed cane and through cutting knives and harvesters that carry the sap of a sick plant onto a healthy one. It gives almost no marks you can see from outside, and it gets worse with every ratoon (the regrowth crop that comes up from the stubble after you cut).
Why it matters
Ratoon stunting disease can quietly take up to a third of your cane (30%), and it costs you a little more every year: each ratoon comes back thinner and shorter than the last until the field is no longer worth cutting. It matters because it shows almost no signs you can see from outside — the plants just fail to fill out — so it spreads unnoticed through your seed cane and your cutting knife. Once the bacteria are inside a stool there is no spray or medicine that will clear them; the only real answer is to stop it getting in. On a dry field the damage is far worse, because the blocked water pipes leave the cane unable to cope with drought.
When to act
Unexplained stand-wide stunting and declining ratoon yields; there are no reliable field symptoms, so treat all seed cane as suspect and act preventively
This guidance is general, compiled from published agronomic references including FAO and CABI. Thresholds and timing shift with your crop, your variety and the season.
In much of the region a spray is simply called mushonga — medicine. But a chemical group you cannot name is one you cannot rotate, and a product you did not write down has no pre-harvest interval you can observe. Mushonga, and other farming words →
The full ratoon stunting disease field guide
- Identify it
- Scout for it
- Control it
15 field-guide sections in the app
The full guide to ratoon stunting disease — every symptom to check, how and when to walk your field looking for it, and the controls that actually work, ranked. Built into your crop plan, so you are told to look before it costs you a harvest.
Crops it affects
Frequently asked questions
How do I identify ratoon stunting disease?
The first thing you see is stunting, not a spot or a rot. The cane comes up thin and short with fewer tillers (fewer stalks per stool), and a whole block looks evenly small rather than one plant here and there. Growth is worse in the dry patches of the field, where the cane cannot pull up enough water.
When should I take action against ratoon stunting disease?
Unexplained stand-wide stunting and declining ratoon yields; there are no reliable field symptoms, so treat all seed cane as suspect and act preventively
How do I control ratoon stunting disease?
Prevent it — start with clean seed (this is your strongest tool). Plant only hot-water-treated seed cane: steeping the stem cuttings (setts) in hot water before planting kills the bacteria living inside them. Where you can, buy your seed cane from a certified, disease-free nursery. Clean seed is what breaks the cycle — this cultural step is the most effective control there is for this disease.
Which crops does ratoon stunting disease affect?
Among the crops covered here: Sugarcane.
Catch it before it costs you a harvest
Divisi builds scouting into your crop plan — it tells you when to walk your field, what to look for at that stage, and what to do when you find it. Free for farmers, works offline.
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