Litchi fruit borer
A small caterpillar that bores into the fruit near the stalk end — a different pest from fruit fly, damaging the seed and pulp from inside rather than stinging the surface.
- Pest type
- Internal fruit-boring caterpillar
- Attacks
- Developing fruit, near the stalk end
- Worst in
- Unmanaged orchards through fruit development
- Main risk
- Bored, unsellable fruit discovered only after picking
Overview
The litchi fruit borer is a small caterpillar pest that attacks developing litchi fruit, boring in typically near the stalk end and feeding on the seed and surrounding pulp from inside. It is a distinct pest from the fruit flies that attack many other fruit crops on this site — a borer tunnels in and feeds internally rather than stinging the fruit surface to lay eggs, and it needs its own management approach rather than fruit-fly traps and baits.
It is one of litchi's most damaging pests: a bored fruit is unsellable in the fresh market, since the internal damage and any resulting rot are usually only discovered when the fruit is opened, by which point it has already been picked, packed or sold as sound fruit. Losses can be severe in an orchard that is not managed proactively through the fruit-development period.
How to identify it
- A fine entry hole, often near the stalk end of the developing fruit, sometimes with a little frass (caterpillar droppings) visible.
- Internally, the seed and surrounding pulp show feeding damage and sometimes rot when the fruit is cut open.
- Unlike fruit fly stings, damage is not usually visible as an obvious external mark until the fruit is closely inspected or opened.
The damage it does
- A bored fruit is unsellable in the fresh market once the internal damage is found.
- Damage is often discovered only after harvest, meaning affected fruit may already be picked, packed or sold before the problem is caught.
- Losses can be severe in an orchard where fruit development is not monitored and managed proactively.
When to act
- Monitor the orchard from fruit set onward, since the pest attacks fruit while it is still developing, not just near harvest.
- Collect and destroy fallen and visibly bored fruit promptly through the season to break the pest's life cycle rather than waiting until harvest to assess damage.
Organic & cultural control
- Collect and destroy fallen and visibly bored fruit promptly and regularly, since fallen fruit can shelter the next generation of the pest.
- Keep the orchard floor clean of fruit debris and plant litter that can shelter pupae between generations.
- Conserve natural predators and parasitoids by avoiding unnecessary broad-spectrum spraying.
Chemical control
- A recommended insecticide timed to fruit set and early fruit development, where the pest has a history in the orchard.
- Observe the pre-harvest interval strictly, since litchi is eaten fresh and does not ripen further after picking.
- Confirm the current recommended product and timing with your local KVK or ICAR-NRC Litchi.
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
My litchi fruit looks fine outside but is damaged and rotten when I cut it open. What happened?
That is almost certainly litchi fruit borer — a caterpillar that bores into the fruit, typically near the stalk end, and feeds on the seed and surrounding pulp from inside. The damage is rarely visible externally until the fruit is opened, which is why regular monitoring and prompt removal of fallen or bored fruit through the fruit-development period matters more than trying to catch it at harvest.
Is this the same pest as fruit fly?
No — it is a different pest entirely. Fruit fly stings the fruit surface to lay eggs and is managed with cue-lure/protein-bait traps, while the litchi fruit borer tunnels directly into the fruit and needs its own insecticide timing and orchard-sanitation approach. Treating one does not control the other.
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.