Ber stone weevil
A weevil documented specifically on ber whose grub develops inside the fruit's hard central stone, reducing seed viability and contributing to premature fruit drop.
- Pest type
- Weevil (grub in fruit stone)
- Attacks
- Fruit → central stone
- Worst in
- Fruit development
- Main risk
- Reduced seed viability; premature fruit drop
Overview
The ber stone weevil (Aubeus himalayanus) is a genuine, documented pest specific to ber (Indian jujube), distinct from the better-known mango stone weevil (Sternochetus mangiferae) despite the similar common name — the two are entirely different species on entirely different host crops. The adult weevil lays eggs on or near the developing fruit, and the grub bores into the fruit's hard central stone, developing largely hidden from outside view.
Its main impact is on the stone rather than the pulp directly, reducing seed viability — a concern for anyone raising rootstock from ber seed — and in a heavy infestation contributing to premature fruit drop as the developing fruit is stressed by the internal damage. Orchard sanitation, particularly collecting and destroying fallen and infested fruit, is the central management practice, since it breaks the pest's life cycle before it can carry over into the next season.
How to identify it
- Fruit that may look largely normal from outside, since the grub develops inside the hard central stone.
- On cutting open the stone of a suspect fruit, a grub, pupa or adult weevil and tunnelling inside.
- Premature dropping of otherwise developing fruit, sometimes the first visible sign of an active infestation.
- A history of the pest in the local ber-growing area is often the first warning to watch for.
The damage it does
- Grub tunnelling inside the ber stone, reducing the viability of the seed inside.
- Contributes to premature fruit drop in a heavy infestation, cutting the harvestable crop.
- Carry-over in the stones of fallen, uncollected fruit that seeds the next season's infestation.
When to act
- Watch for premature fruit drop during fruit development as an early sign of infestation.
- Collect and destroy fallen fruit promptly and regularly through the season — the grub survives inside the stone in fallen fruit.
- Time any insecticide application to early fruit development where local pressure is known to be high.
Organic & cultural control
- Orchard sanitation is central — collect and destroy fallen and infested fruit promptly so the weevil cannot carry over in the stones.
- Regular ground clean-up under the trees through the fruiting season reduces the pest's local population.
- Avoid leaving culled or dropped fruit to accumulate near the orchard.
Chemical control
- Where warranted, a recommended insecticide timed to early fruit development can reduce successful infestation.
- Because the grub develops inside the stone, sanitation is the mainstay — sprays are most useful at the egg-laying stage before the grub bores in.
- Observe the pre-harvest interval and confirm the current recommendation with your local KVK.
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
Is the ber stone weevil the same as the mango stone weevil?
No — despite the similar name, they are different species on different crops. The ber stone weevil is Aubeus himalayanus, documented specifically on ber, while the mango stone weevil is Sternochetus mangiferae, a separate species specific to mango. Confusing the two risks the wrong management assumption, since they are not interchangeable pests.
How does the ber stone weevil damage the crop?
Its grub develops inside the fruit's hard central stone, reducing seed viability — relevant for anyone raising ber rootstock from seed — and in a heavy infestation the internal damage contributes to premature fruit drop, cutting the harvestable crop.
How do I control ber stone weevil?
Orchard sanitation is the central defence: collect and destroy fallen and infested fruit promptly and regularly through the fruiting season, since the grub survives inside the stone of fallen fruit and carries over to infest the next season. Where pressure is known to be high locally, a recommended insecticide timed to early fruit development can help.
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.