Nematodes, also known as roundworms, are microscopically small and are effectively used to control black flies by killing the flies' larvae in the soil. When the nematodes are watered out, these seek insect parasitic nematodes actively uproot the larvae in the soil and infect them, causing the larvae to die.

The dead larva acts as a growth site for new nematodes. Since they feed only on the insect larvae of the midges and to some extent thrips, they do not harm your plants. Nematodes are supplied in quantities of 10 million or 50 million, mixed in fine clay.

Instructions for use: Dissolve the contents in water and water the soil where the midge larvae are found. Treat all plants in the same area for best results. Keep the soil slightly moist during the week after treatment. Use the nematodes as quickly as possible.

Follow up the treatment:
The nematodes only fight the larval stages, so the reduction of adult mosquitoes becomes visible after 2-3 weeks. Hang up yellow adhesive discs to catch adult mosquitoes and speed up the effect.