Shoot borer (ginger & turmeric)
Bores into the ginger/turmeric pseudostem so the central shoot yellows into a "dead heart" — and into the rhizome, letting rot in.
- Pest type
- Shoot-boring caterpillar
- Attacks
- Pseudostem, central shoot, rhizome
- Worst in
- Active shoot growth (monsoon)
- Main risk
- Dead heart; rhizome boring & rot
Overview
The shoot borer is the most damaging pest of the shoots of ginger and turmeric. The moth lays eggs on the pseudostem and leaves; the caterpillar bores into the pseudostem and feeds inside, cutting off the central shoot, which yellows, withers and dries into a "dead heart" while the outer leaves may still be green.
The bore hole is usually marked by frass (droppings) pushed out, and the same pest can bore down into the rhizome, damaging it directly and opening it to soft rot and other rhizome rots. Because the caterpillar feeds inside the shoot, control depends on catching young larvae, removing dead-heart shoots to take out the borer, and protecting the crop during the vulnerable shoot-growth period.
How to identify it
- A yellowing, withering central shoot ("dead heart") that dries while the outer leaves may stay green.
- A bore hole in the pseudostem with frass (droppings) pushed out around it.
- On splitting an affected pseudostem or rhizome, a caterpillar and a tunnel inside.
- Damage during the active shoot-growth period, mainly in the monsoon months.
The damage it does
- Dead heart that kills the central shoot and reduces the number of healthy tillers.
- Bored rhizomes with direct damage and entry points for soft rot and other rhizome rots.
- Reduced growth and rhizome yield in a sustained attack.
- Loss compounded when rhizome rot follows the boring.
When to act
- Scout for the first dead hearts and frass-marked bore holes during active shoot growth in the monsoon.
- Act at the young-larva stage before it is deep in the shoot or rhizome.
- Remove and destroy dead-heart shoots promptly to take out the borers inside.
Organic & cultural control
- Cut and destroy dead-heart shoots (with the caterpillar inside) as soon as they appear.
- Spray neem (NSKE 5%) on young larvae, use pheromone/light traps to monitor the moths, and conserve natural enemies.
- Use healthy, pest-free seed rhizomes, follow crop rotation, and keep the field clean of residue that harbours the pest.
- Earthing-up and good crop hygiene help protect the shoots and rhizomes.
Chemical control
- Target young larvae before they bore in, with a CIB&RC-registered insecticide for the crop, timed to the shoot-growth period.
- Because the borer is inside the shoot/rhizome, early timing and removing dead hearts matter more than late spraying.
- Rotate insecticide groups and observe the pre-harvest interval — the rhizome is the edible product.
- Confirm the current recommendation and dose for your area with your local KVK or spices research station.
Crops most at risk
Where this problem is called out in our crop guides — open a crop for the full package of practices.
Frequently asked questions
The central shoot of my ginger/turmeric is yellowing and drying. What is it?
That "dead heart" — a yellowing, withering central shoot that dries while the outer leaves may stay green — is the shoot borer. The caterpillar bores into the pseudostem and cuts off the central shoot, usually leaving a frass-marked bore hole. Cut and destroy dead-heart shoots to remove the borer, and target young larvae during shoot growth.
Does the shoot borer also damage the rhizome?
Yes — the same pest can bore down into the rhizome, damaging it directly and opening entry points for soft rot and other rhizome rots, so the loss can compound. Using healthy seed rhizomes, removing dead-heart shoots, crop rotation and good field hygiene all help protect both the shoots and the rhizome.
When should I control it?
During the active shoot-growth period in the monsoon, targeting young larvae before they bore deep into the shoot or rhizome, and removing dead-heart shoots promptly to take out the borers inside. Use neem and traps for monitoring, and a rotated registered insecticide timed to shoot growth, observing the pre-harvest interval. Confirm locally with your KVK.
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.