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How to deal with Chafer Grubs - naturally

How to deal with Chafer Grubs - naturally
By Heather 7 years ago

Chafer Grubs are not all bad.... They make a tasty snack for all sorts of birds and if you have chickens they will love them. However, when those pesky grubs get out of hand they can really ruin your lawn, so here's how to recognise the problem and advice on what to do about them.

Now August is here, we all love what it brings in terms of sun and holidays, but on the downside it also means that young chafer grub larvae are active too.

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What are the signs that I might have chafer grub in my lawn?

If your grass seems to be growing too slowly, not growing at all or is easily pulled up and/or there are yellow patches appearing then it may be grubs attacking the grass roots (see below images)

As I mentioned lots of wildlife enjoy a chafer grub or two so if you see wildlife, such as badgers and foxes digging up your lawn or birds, such as rooks, magpies and crows feeding on it then they be in search of the grubs for food, and this can be the first signs to look out for a potential problem.

When should I apply Nemasys Chafer Grub Killer?

Apply to moist lawns during August and early October, when the young grub larvae are active. Do not wait until too late in the season when a lot of damage has been done as, by this time the grubs may have started to move down deeper in the soil and become inactive until the following spring. They lay dormant until the next year and, if the life cycle is not broken, then re-infestation occurs and the problem gets progressively worse.

What does a chafer grub look like?

Distinguishing between vine weevil larvae and chafer grubs is easy when you know what to look for! Chafer grubs are creamy coloured, about 1.5 cm (0.6 inch) in length and have distinctive legs (figure 1). They are found in the root systems of plants and lawns; whereas vine weevil larvae, which are legless white larvae with a hard, orange head (figure 2), attack the roots of a range of plants, but not normally lawns.

  • Use Nemasys Chafer Grub Killer to deal with a chafer grub infestation, without any of the precautions associated with chemical use, such as excluding children and pets from treated areas until dry or the question of what to do about grazing pets, such as rabbits and guinea pigs.
  • Apply to moist lawns during August and early October. This is when the young grub larvae are active and the temperature is above 12ºC (54ºF).
  • Immediately after applying the nematodes, water the grass well so the nematodes are washed into the soil to reach the roots where the chafer grubs will be. Make sure the lawn does not dry out after applying nematodes. Keep the lawn well watered for at least two weeks.
  • Do not apply too late, since the grubs start to move down deeper in the soil and become inactive until the following spring. However, as this move downwards is temperature dependent, in some years it may still be alright to apply later. As long as the grubs are near the surface and the soil temperature is above 12ºC (54ºF) nematodes can still be applied.
  • The nematodes (Heterorhabditis sp) seek out the chafer grubs and attack the pest by entering natural body openings. Once inside, they release bacteria that stops the pest from feeding, quickly killing the pest. They do not stop there. The nematodes reproduce inside the dead pest and release a new generation of hungry infective nematodes, which disperse and search for further prey.
  • To Order Nemasys Chafer Grub Killer it's in stock now


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