Jute stem weevil
The damage happens in the first few weeks of growth, and a stem that bends at that stage stays bent for the rest of the season — this is a pest you have to catch early or not at all.
- Pest type
- Small weevil (stem borer)
- Attacks
- Growing tip of young stems
- Worst in
- Early vegetative stage
- Main risk
- Permanent kink, lower fibre grade
Overview
Jute stem weevil is a very small weevil (a beetle with a snout) whose grub bores into the growing tip of a young jute stem. As the grub feeds inside, that part of the stem swells or bends, and because a jute stem does not straighten itself out once it has grown past a point, the kink stays there for the rest of the season.
The plant usually keeps growing above the damaged point, so the crop is not killed outright, but a visibly bent or crooked stem is downgraded when the fibre is extracted and sold, since millers and buyers pay less for kinked, irregular fibre than for straight, even lengths.
How to identify it
- Very small weevils (tiny beetles with a snout) may be seen on young shoots, though the damage is easier to spot than the insect itself.
- Look for a swollen or gall-like lump, or a visible bend, on the stem of a young plant near where the growing tip was.
- The stem usually keeps growing above the damaged point, so older plants show a permanent kink partway up an otherwise normal-looking stem.
The damage it does
- The bend or kink is permanent — once the stem has grown past the damaged point, it does not straighten out for the rest of the season.
- A kinked or crooked stem is downgraded at the fibre-extraction stage, fetching a lower price even though the plant itself grew to full length.
- Damage is worst on young plants in the early weeks, when the growing tip is small, tender and most exposed to attack.
When to act
- Check young plants closely in the first several weeks after emergence, since this is the only stage when the pest can cause this damage.
- Act at the very first sign of a swelling or bend, since a kink already formed in the stem cannot be undone by any later treatment.
- Pay extra attention in fields with a known history of this pest from previous seasons.
Organic & cultural control
- Remove and destroy visibly damaged, bent young shoots early where practical, to reduce the weevil population before it spreads further in the field.
- Sow at the recommended time and keep the stand healthy, so plants grow through the vulnerable early stage as quickly as possible.
- Keep field margins clear of weeds that can shelter the weevil between jute crops.
Chemical control
- A recommended insecticide spray at the vulnerable early vegetative stage can help in fields with a known history of weevil damage.
- Timing matters far more than product choice here — a spray after stems have already bent protects nothing, since the damage is already locked in.
- Confirm the current recommended product and dose for jute 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
Some of my young jute stems have a swelling or a bend near the top. What is this?
This is likely jute stem weevil damage. A tiny weevil grub bores into the growing tip of a young stem, and the stem swells or bends at that point as it keeps growing above the damage. The bend is permanent, so check young plants early to catch it before it spreads.
Will the bent stem straighten out as the plant grows?
No. Once a jute stem bends or kinks at the point of damage, it stays that way for the rest of the season — the plant keeps growing above it, but the kink itself does not go away.
Does a bent stem still produce usable fibre?
Yes, the plant usually survives and the fibre can still be extracted, but a kinked or crooked stem is downgraded and sold at a lower price than straight, even stems, so it is still a real loss even though the plant is not killed.
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.