If you've ever come downstairs on a summer morning to find your lawn looking like it's been visited by a small landscaping disaster — turf flipped over, holes scratched into the surface, soil scattered across the grass — you've probably already met the chafer grub. Or rather, you've met the foxes, badgers, crows or magpies who've worked out that there are chafer grubs in your lawn, and have spent the night excavating them with great enthusiasm and zero regard for your gardening.

The chafer grub itself does some of the damage — chewing the grass roots from below — but the secondary havoc caused by hungry wildlife digging for them is often far more visible and distressing. Treating the grubs reduces both the root damage and (crucially) the reason wildlife are tearing your lawn apart.

This is the gentle answer. Microscopic beneficial nematodes — naturally occurring soil organisms — that target chafer larvae specifically, while leaving the rest of your garden ecosystem completely undisturbed. From Ladybird Plant Care, our trusted suppliers of biological controls — chosen because they help us work with the garden rather than against it.

What chafer grubs do

Chafer larvae are the C-shaped white grubs of various chafer beetle species (most commonly the garden chafer and the cockchafer in UK lawns). They live just below the surface of the lawn, feeding on grass roots through summer and autumn before pupating and emerging as adult beetles the following spring.

The damage shows up in two ways:

• Direct damage — patches of grass that look yellow, sparse or dead, with the turf becoming loose enough to lift away easily. The roots have simply been eaten through
• Wildlife damage — and this is usually the dramatic part. Foxes, badgers, crows, magpies, jackdaws and starlings all know that chafer-affected lawns are dinner. They'll scratch, dig, peel back turf and excavate enthusiastically. A serious infestation followed by a hungry fox visit can leave a previously lovely lawn looking properly destroyed

Treating the grubs deals with both problems. With no chafer larvae to find, the wildlife move on to other gardens, and your lawn is left to recover.

How nematodes work

The nematodes in this pack are microscopic beneficial roundworms that target chafer larvae specifically. Mixed with water and applied to the lawn, they move down through the moist soil to find the grubs, infect them, and end the larval stage of the life cycle. The grass roots stay safe; the wildlife find nothing to dig for.

Crucially, they're completely safe for everything else: bees, butterflies, ladybirds, earthworms, birds, pets, children, garden plants. The targeting is genuinely specific — these nematodes evolved alongside their host species and don't affect anything else living in the soil.

When to treat — timing matters

Chafer treatment timing is more nuanced than some other biological controls. There are two windows worth knowing about:

• Late summer (typically August–early October) — the ideal treatment window. The grubs that hatched earlier in the year are still small and shallow, making them most vulnerable to nematode infection. Soil is usually warm enough and moist enough for nematodes to work effectively
• Spring (typically April–May) — a secondary window if you've discovered grub damage in spring before the larvae pupate. Less effective than autumn treatment because the grubs are larger and tougher, but worth doing if your lawn is actively suffering

Soil temperature must be reliably above 12°C for the nematodes to be effective. Apply too early in spring or too late in autumn and they simply won't have the warmth they need to find their hosts.

A note on honest expectations: autumn treatment is significantly more effective than spring. If you're choosing between treating in May or waiting until August/September, the autumn application will give you a far better result. But if your lawn is being destroyed in May and you can't bear to wait, some treatment is better than none.

How to apply

Full instructions come with the pack, but in short:

• Water the lawn thoroughly the day before treatment — nematodes need moist soil to move through
• Mix the nematodes with water following the pack guidance
• Apply with a watering can (rose removed) evenly across the affected area — or with a hose-end applicator for larger lawns
• Water the lawn again immediately after application to wash the nematodes down into the soil where the grubs are
• Keep the lawn moist for 1–2 weeks after treatment — this is the most important part. If the soil dries out, the nematodes can't work

Apply on an overcast day or in the cool of evening rather than the heat of midday. Direct strong sunlight is the one thing nematodes really don't tolerate.

Ordering and despatch

Because these are live biological controls, we don't keep them on standing stock — they're ordered in fresh from Ladybird Plant Care so they reach you as effective as possible.

• Order by 10am Monday for despatch the same week
• Orders placed after 10am Monday will despatch the following week
• Not sold during colder months — when soil temperatures are below 12°C, the nematodes can't work, so we pause supply during winter rather than send a product that won't help

Worth bearing in mind when planning your treatment — give yourself a few days' grace, and check soil temperature before ordering if you're at the edges of the season.

What else helps

Nematodes are the most effective intervention, but a few additional habits help reduce chafer problems and recover damaged lawns:

• Aerate the lawn in autumn — well-drained, healthy turf supports stronger root systems that better tolerate grub damage
• Top-dress with compost or sandy loam on damaged areas — encourages quicker recovery
• Overseed bare patches in late summer or early autumn after treatment
• Don't overwater in summer — chafer adults prefer moist lawns for laying eggs, so very wet conditions in early summer can encourage them
• Tolerate a slightly less perfect lawn — small numbers of chafer grubs are normal, and a healthy lawn copes with them. Treatment is needed when populations reach damaging levels rather than as routine

The combination of nematodes for the larvae, healthy lawn management, and patience through one growing season usually returns a damaged lawn to good condition.

About Ladybird Plant Care

Ladybird Plant Care are specialists in biological pest controls — gentle, naturally-derived solutions for problems that have traditionally been tackled with chemicals. We stock their range because their approach mirrors our own: work with the garden, not against it, and trust the wider ecosystem to find its own balance.

A note on managing expectations: nematode treatment works gradually. You won't see dramatic results overnight — what you'll notice over the following weeks is that wildlife stop digging, the affected patches stop spreading, and the lawn slowly starts recovering as the grass roots regrow. By the following spring, with some overseeding and patience, most chafer-damaged lawns return to good condition. The work happens quietly, beneath the surface, exactly as it should.