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How to recognize beetles

Beetles belong to the order of Coleoptera, which is a large order inside the insects. More than 300.000 species are known worldwide and they can vary in size from less than half a milimeter to giant beetles of up to 15 cm. Beetles can be recognized by their hard, often colourful covershields that protect the membranous hind wings. Beetles undergo methamorphosis and, in Europe, they usually have one generation per year. 

The lifestyle varies heavily between the different beetle species. Some species are mostly nocturnal and hide during the day. Other species are mainly observed during the day. Plant feeding beetles can cause major damage, while other species, like ladybirds, are beneficial and can be useful in pest control 

Garden chafer Phyllopertha horticola
The garden chafer

Beetle damage

Beetles mainly cause damage in outdoor ornamental crops, but also in ornamental- and vegetable gardens. Adults and larvae of harmful beetles often feed on leaves causing growth reduction and cosmetic damage. 

Some larvae are known to feed on roots, which causes entire plants to die. A well-known example of such a beetle is the black vine weevil. Adult black vine weevils individuals take round ‘bites’ out of the leaves during the night causing cosmetic damage. The larvae cause heavy damage by feeding below-ground on roots, causing entire plants to die. 

Common beetle species

Black vine weevil
Armadillo weevil
Garden chafer

How to control beetles

To control beetles entomopathogenic nematodes are often used, such as the products CAPSANEM, ENTONEM or LARVANEM. Only below-ground life stage of beetles (larvae and pupae) are targeted by the nematodes, which eventually will lead to a reduction of the adult beetle population. Different species of nematodes are available, but they all work according to the same principle. The nematodes, who contain a specific bacteria that is lethal to the host, enter the beetle larvae or pupae. After a while, the beetles die and the nematodes can feed from the host. The nematodes will keep reproducing as long as there are beetle larvae available. There are three different nematode species available which all have specific applications. 

LARVANEM: Heterorhabditis bacteriophora nematode beetle biological control
LARVANEM: An effective method to control beetles

Our products against beetles


Effective against
- Fungus gnats
- Beetle larvae
- Thrips pupae


Effective against
- Several beetles
- Caterpillars

LARVANEM: Heterorhabditis bacteriophora for the biological control of beetle larvae


Effective against
- Garden chafer
- Black vine weevil
- Cockchafer
- Armadillo weevil