Garlic bloat mite (eriophyid mite)
This mite travels inside the seed clove itself, so apparently healthy-looking planting material can quietly carry it into next season’s crop.
- Pest type
- Microscopic mite
- Attacks
- Leaves & cloves
- Worst in
- Infected planting material
- Main risk
- Carries over in seed cloves
Overview
Garlic bloat mite, also called eriophyid mite, is microscopic — far too small to see with the eye. It is diagnosed by the damage it causes: twisted, curled, streaked leaves in the field, and, in storage, sunken tan patches with a dry, spongy rot developing inside the cloves.
What makes this pest a serious, recurring problem is that it is carried inside the clove itself. Infested planting material spreads it straight into the next crop, and damage continues after harvest, in storage, on top of whatever leaf damage was already done in the field — so apparently clean-looking seed can still be the source of the problem.
How to identify it
- Microscopic mites, not visible to the eye, so diagnosis is by the damage pattern — twisted, curled, streaked leaves in the field.
- In storage, infested bulbs show sunken tan patches and a dry, spongy rot developing inside the cloves.
- Because the mite travels inside the clove itself, apparently healthy-looking seed can still be carrying it.
The damage it does
- A serious pest precisely because it is carried inside the cloves — infested planting material spreads it straight into the next crop.
- Damage continues after harvest, in storage, on top of the leaf damage already done in the field.
- A field planted with infected cloves can show poor, twisted growth from early on, cutting yield before any spray can help.
When to act
- Inspect seed cloves before planting, and discard any that look shrivelled, discoloured or otherwise suspect, rather than saving them to cut costs.
- Watch for twisted or streaked leaves early in the crop, since by the time bulbs show storage rot the field damage is already done.
- Treat this as a seed-quality problem first — spraying an established field infestation is far less effective than starting with clean cloves.
Organic & cultural control
- Plant only clean, mite-free cloves from a reliable source — this is the single most effective step, since sprays reach the sheltered mites poorly.
- Hot-water treatment or another recommended treatment of planting material controls the mite where it is a known problem in the area.
- Discard visibly infested or poor-quality bulbs rather than saving them for the next season’s seed.
Chemical control
- A recommended acaricide dip or treatment of planting cloves before sowing, where the mite is established in your area, following local advisory.
- Field sprays on a growing crop reach the sheltered mites poorly, so clove treatment before planting is the more effective point to act.
- Confirm the current recommended treatment and dose with your local KVK before treating seed cloves.
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 garlic leaves look twisted and streaked. What is causing it?
This can be garlic bloat mite — a microscopic mite you cannot see, identified by the twisted, curled, streaked leaves it causes. Since it often travels inside the seed cloves themselves, check where your planting material came from.
I stored garlic that looked healthy, but now some bulbs have sunken, spongy patches. Is this the same pest?
Yes — this mite keeps damaging cloves in storage even after a normal-looking harvest, causing sunken tan patches and dry, spongy rot. It is one reason apparently healthy bulbs can go bad in store.
How do I stop it from coming back every season?
Start with clean, mite-free seed cloves from a reliable source, and consider a hot-water or other recommended treatment of planting material if the mite is known in your area. This matters more than any field spray, since the pest travels inside the clove.
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.