Divisi
Tobacco mosaic virus
Tobacco mosaic virus · Viral
Photo: R.J. Reynolds Tobacco Company Slide Set · CC BY 3.0 us
Tobacco mosaic virus is a tough, long-lived virus that attacks tobacco, tomato and pepper. Unlike most diseases it is not carried by an insect — it rides on your own hands, tools, clothes and on tobacco, and slips into the plant through tiny wounds made when you transplant, stake, prune or pick. Once a plant is infected there is no medicine to save it, so the whole fight is about keeping it out and pulling out the sick plants fast.
RosieScienceGal · CC BY-SA 4.0 
Tashkoskip · CC BY-SA 4.0
Why it matters
This virus can steal up to 40% of your harvest — nearly half the crop — by stunting plants and leaving tomato and pepper fruit small, mottled and brown-marked inside so they fetch a poor price or none at all. It is hard to beat because there is no spray or medicine that cures it: once a plant catches it, it stays sick for life. Worse, it spreads on your own hands and tools as you work down the row, and it can sit alive for months in dead leaves, on stakes and in tobacco — so one careless touch can seed the whole field.
When to act
Rogue symptomatic plants as soon as they are seen and tighten hygiene; there is no cure, so management is preventive.
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 tobacco mosaic virus field guide
- Identify it
- Scout for it
- Control it
15 field-guide sections in the app
The full guide to tobacco mosaic virus — 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 tobacco mosaic virus?
The first thing you see: on the young top leaves, a pattern of light-green and dark-green patches mixed together — like a blotchy map or the skin of an unripe pawpaw. This uneven "mosaic" is the giveaway; a healthy leaf is one even green all over.
When should I take action against tobacco mosaic virus?
Rogue symptomatic plants as soon as they are seen and tighten hygiene; there is no cure, so management is preventive.
How do I control tobacco mosaic virus?
Prevent first — plant resistance (your strongest tool): where you can, grow resistant or tolerant varieties of tomato, pepper and tobacco that carry known resistance genes, and start from clean, tested seed. This is the single most effective defence you have — a resistant plant simply doesn't catch it the way a susceptible one does.
Which crops does tobacco mosaic virus affect?
Among the crops covered here: Tobacco, Tomato.
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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