Lawn Pests
Since April 2016 the withdrawal of commercial insecticides has left every turf producer with no defense against Leather Jackets and Chafer Grubs. These are the larvae of crane fly/daddy long legs and chafer Beatles. Both of these pests feed off the root of the grass and can damage the health of your lawn. Once in a domestic garden these pests can be treated with Nematodes, a microscopic natural predator of the larvae, but safe and environmentally friendly.
Leather Jackets
A crane fly is more commonly known as a daddy long legs, and a leatherjacket is the common name for the larvae form before it becomes a crane fly.leatherjackets cause damage by eating the grass roots, resulting in a patchy lawn with sparse, bare and dead areas. They are a greyish brown colour with a tough skin.
Chafer Grubs
Chafer Grubs are the larvae stage of the Chafer Beetle which feed on lawn roots and their burrowing can cause soil disruption making the lawn spongy under foot. They have white body with orange head and are usually curled up.
What should you look out for?
Look for the adult crane flies or chafer beetles in your garden. Keep an eye out for any yellow/brown spots or patches appearing in your lawn; they tend to be very dry and course. You can do a test by waiting for a downpour and then laying some black polythene or similar over a 2m x 2m area of your lawn for 24 hours. After 24 hours lift the plastic and look for signs of larvae on top of the grass, under the patch where the plastic was.
How to treat them?
The nematodes used to kill leatherjackets are different to the ones for chafer grubs.
You can remove any grubs that you can manually. Once in a garden these pests can be treated with Nematodes. Make sure you keep your nematodes in a cool environment such as a fridge and apply as soon as possible for best results. You can apply nematodes using a sprayer or a watering can. Always follow the instructions on the product.
Moles
How to treat them?
Mole netting
Netting is available which can prevent moles coming to the lawn surface to create molehills. This must however be installed before turf is laid.
Electronic devices
Electronic devices are available from some garden centres and mail order firms. Their buzzing noise is said to drive moles away.