BioBestrijding Nematodes against snails

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The Phasmarhabditis hermaphrodita nematodes can be used as biological control agents of different types of slugs....More information
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  • Article number: IK.4621

BioBestrijding Nematodesagainst Snails

The Phasmarhabditis hermaphrodita nematodes (nematodes) can be used as biological control agents of different slug species. They come in mineral powder ready to be mixed with water. With this mixture you can easily spray the soil with a watering can.

Nematodes are effective against

The Phasmarhabditis hermaphrodita nematodes are especially effective against slugs that live in the soil. In theory they also work against normal snails, but because normal snails live above ground, the nematodes do not come into contact with these snails. The nematodes are most effective in combating the gray slug, Deroceras reticulatum. This is the most widespread pest species in the world and is responsible for most agricultural and horticultural damage. In addition, the nematodes have also been proven to be effective against various other slugs. The nematodes penetrate the slugs and infect them with bacteria from their intestinal tract. This bacteria multiplies in the host and stops it from causing damage. After 3 to 5 days, the snails will stop eating. The infected snails will die underground within 2 weeks after application. The affected snails are sometimes slightly swollen. For good control it is important to use the nematodes early when the snails are still young (and small). If the body weight of a snail is so large, it will be difficult for the nematodes to kill these large specimens. The use of the nematodes has an effect for about 6 weeks, provided the conditions for the nematodes are good (humidity, temperature, etc.). Below is an overview of the nudibranchs that can be used against nematodes: Arion ater (small specimens), Arion distinctus, Arion intermedius, Arion lusitanicus (small specimens), Arion silvaticus, Deroceras reticulatum (the gray slug), Deroceras panormitanum , Leidyula floridana, Tandonia budapestensis, Tandonia sowerbyi


Nematodes are roundworms (Nematodes) that occur naturally in the soil. They are very small (0.3 to 0.7 mm) and therefore invisible. They are harmless to humans, animals and plants.


Nematodes live in the soil and search for larvae and pupae of pest insects. They cannot fight adult specimens. There are many types of nematodes, each of which specifically targets a particular type of host. They enter their prey and infect it with a bacterium from their intestinal tract. This bacteria multiplies in the host and stops it from causing damage and eventually dies. Nematodes then feed on these same bacteria, which in turn cause them to multiply. A single insect larva can be the hotbed of thousands of nematodes. The pest insects are thus attacked by a true army of nematodes. As soon as the host is killed, the nematodes leave it and look for new hosts. As long as prey is present in the soil, the nematodes can maintain themselves and multiply.


Completely organic and environmentally friendly. Completely harmless to children, pets, birds and wildlife. Perfectly safe to use around food crops. The snail retreats underground before dying, so you won't be left with an abundance of dead snails on the surface. Dead snails eaten by other creatures are non-toxic. Impossible to apply too much. Works well in wet weather; exactly the conditions in which slugs are most active and destructive. Can be used with most garden chemicals - including fertilizers - although it is best to apply them at different times. You do not introduce foreign organisms into your garden; simply refill the good microbes that are already there. You get the same benefits that commercial growers have been using for over twenty years


The nematodes can be used at a soil temperature between 4 and 34 degrees. It is important that the nematodes are applied to a moist soil that should not dry out for several weeks for optimal effect. Regular spraying in dry weather is therefore a must. During or just before a rain shower is an ideal time to release the nematodes. Note: do not turn off during night frost.


Exactly when you need to release the nematodes depends on the development phase of the host in question. Ideally, the host is in a sensitive state so that the nematodes can easily penetrate prey. We recommend about 500,000 nematodes per m2 for a minor infection. With a larger infection you can increase this number to 1 million nematodes per m2. You can repeat this bet after 2-3 weeks. It is expanded as follows for soil application: - Leave the nematodes for at least half an hour

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