Katte disease (Cardamom mosaic virus)
A systemic, incurable virus of small cardamom — chlorotic stripes on the youngest leaf, a stunted clump and small, deformed capsules for the rest of its life. Spread mainly by the banana aphid, and carried farm to farm on infected suckers.
- Pathogen
- Cardamom mosaic virus (CMV)
- Spreads by
- Banana aphid; mainly infected suckers/rhizomes
- Favoured by
- Diseased planting material reused season after season
- Main risk
- Stunted clump, deformed capsules, lifelong yield loss
Overview
Katte (also written Kokke Kandu) is the most economically damaging viral disease of small cardamom, caused by Cardamom mosaic virus. The first sign appears on the youngest leaf of an infected tiller: spindle-shaped, pale chlorotic flecks that lengthen into discontinuous stripes of pale and dark green running parallel to the leaf veins. As the disease advances, every new leaf and tiller shows the characteristic mosaic mottling, the clump becomes progressively stunted and bushy with thin, undersized tillers, and the panicles that do form set fewer, smaller and often malformed capsules.
The virus is spread mainly by the banana aphid (Pentalonia nigronervosa) feeding on infected plants and moving to healthy ones, but its most important pathway in practice is human — infected rhizomes and suckers dug from a diseased clump and planted in a new field or a neighbouring farm carry the virus with them. Because there is no cure once a plant is infected, and yield loss can run from a partial reduction in a young infection to a near-total loss in an old, badly affected clump, management is entirely about prevention: planting only certified virus-indexed suckers, roguing out infected clumps the moment they are spotted, and controlling the aphid vector around the nursery and field.
How to identify it
- The youngest leaf of an infected tiller shows spindle-shaped, pale chlorotic flecks first.
- These lengthen into discontinuous stripes of pale and dark green running parallel to the leaf veins — the "mosaic" pattern.
- The clump becomes progressively stunted, bushy and thin-tillered as more shoots show symptoms.
- Panicles set fewer capsules, and the capsules that do form are small, malformed and of poor quality.
What causes it and when
- Cardamom mosaic virus, spread mainly by the banana aphid (Pentalonia nigronervosa) as it feeds on infected plants and moves to healthy ones nearby.
- The dominant real-world pathway is planting material, not the aphid alone — suckers and rhizomes dug from an infected clump carry the virus wherever they are planted.
- Once a tiller is infected it stays infected for life; there is no recovery and no chemical cure for the plant itself.
- Spread accelerates wherever farmers routinely exchange or sell uncertified suckers between fields and estates.
Cultural & organic control
- Plant only suckers or rhizomes sourced from a certified, virus-indexed mother-plant nursery — never material from an unchecked neighbouring clump.
- Inspect the field regularly, especially the youngest leaves, and rogue out and destroy any clump showing the chlorotic-fleck or mosaic-stripe symptom the moment it is seen.
- Grow a tolerant/resistant release such as IISR Vijetha in areas with a history of Katte pressure.
- Isolate a new planting from older, disease-affected blocks where practical, and disinfect tools used near suspect clumps.
Chemical (vector) control
- The virus itself cannot be sprayed away — chemical effort goes into the banana aphid vector, not the plant.
- A recommended systemic insecticide against banana aphid colonies, applied around the nursery and field margins, slows new spread.
- Vector control alone will not stop an epidemic already established through infected suckers — roguing and clean planting material matter more.
- Confirm the current aphid-management product and dose for cardamom with your local KVK or the Indian Cardamom Research Institute.
Prevent it coming back
- Base every new planting on certified, virus-indexed suckers — this single decision does more than any later spray.
- Rogue and destroy infected clumps early and completely, including the rhizome, rather than leaving a diseased plant in the ground.
- Manage the banana aphid vector around nurseries and young plantings.
- Avoid taking or accepting planting material from farms with a known Katte history.
Crops most at risk
Where this problem is called out in our crop guides — open a crop for the full package of practices.
Varieties to consider
Named seed varieties whose resistance or susceptibility to this problem is documented on their own variety page.
Frequently asked questions
My cardamom leaves have pale stripes running along the veins and the clump looks stunted. What is it?
That pattern — spindle-shaped pale flecks on the youngest leaf that lengthen into stripes parallel to the veins, alongside a stunted, bushy clump — is the classic sign of Katte disease (Cardamom mosaic virus). There is no cure for an infected plant. Rogue out and destroy the clump completely, including its rhizome, and plant only certified virus-indexed suckers when you replant.
Why does Katte spread even in a well-managed field with few aphids?
Because its most important pathway is not the aphid but the planting material itself. Suckers and rhizomes dug from an already-infected clump carry the virus wherever they are planted, and farmer-to-farmer exchange of uncertified suckers is how the disease travels between fields and estates. Controlling the banana aphid vector helps slow local spread, but sourcing every new planting from a certified, virus-indexed nursery is what actually keeps a field clean.
Can a Katte-resistant variety still get infected?
IISR Vijetha is bred with field resistance to Katte and is recommended for areas under moderate to high mosaic pressure, but "resistant" here means better tolerance and reduced spread under pressure, not total immunity. It should still be paired with certified planting material and prompt roguing of any symptomatic clump, rather than relied on alone.
Symptoms and control measures follow ICAR, KVK and state agricultural-university package-of-practices; any named chemical is a registered use. Always read the product label and confirm the dose for your crop and zone. editorial policy.