Biological control of soil pests in beds and turf

What are nematodes and how do they work outdoors?

Nematodes are microscopic, living organisms that naturally occur in soil. They have been used for years as a biological way to control harmful insect larvae in gardens and lawns. Econema nematodes enter the larvae and stop them from the inside out. This happens naturally and is safe for plants, people, pets and the wider soil life.

Outdoors, nematodes work below the surface. Many pests spend most of their life cycle in the soil, where they damage roots and weaken grass. Applying nematodes evenly helps you target the problem at its source.

When should you use nematodes in garden and lawn?

Nematodes are used to control soil pests such as:

• chafer grubs
• leatherjackets
• larvae of various beetles and moths

Use nematodes when you notice poor growth, patches of dying grass, turf lifting easily, or signs of root damage. Starting early improves the chances of success.

Step 2 – Make the base mix

Dissolve the entire pack of nematodes in 1 litre of water.

• Stir gently but thoroughly
• Keep the nematodes evenly suspended in the water
• Let the mix stand for a few minutes

Use a full pack per treatment. Nematodes are living organisms and do not perform well when partially stored or handled incorrectly.

Step 3 – Dilute and apply

Mix the base mix with enough water to cover the area you want to treat.

Guideline for garden and lawn

• About 10 litres of diluted solution per 10 m²

Apply evenly using a watering can or sprayer without fine filters, so the nematodes are not damaged.

Best time to apply

Apply nematodes preferably:

• early in the morning, or
• later in the evening

Avoid strong sunlight and hot conditions. UV and drying reduce survival and effectiveness.

Step 4 – Aftercare and repeat if needed

After application, keep conditions favourable so the nematodes stay active.

• Keep the soil moist for 7 to 14 days
• Lightly water again if needed
• Do not use chemical treatments

You usually see the first improvement within 2 to 3 weeks.
If the pest pressure remains high, the treatment can be repeated after a few weeks.

Key tips for best results

• Ideal soil temperature: 10–25 °C
• Use nematodes as fresh as possible
• Store unopened packs in a cool place
• A higher dose than recommended can increase the chance of nematodes meeting the target pests, but correct and even application is still the most important factor
• Healthy soil structure and good maintenance help prevent reinfestation