Category: News
Date published: July 20, 2016

Correct application crucial for effective vine weevil control

The larvae and pupae of the black vine weevil (Otiorhynchus sulcatus) can be controlled with our beneficial nematodes. Correct application is crucial for the effectiveness of this biological solution.

Depending on the soil temperature our product Larvanem (Heterorhabiditis bacteriophora) or Entonem (Steinernema feltiae) can be used in tree nursery crops (yew, thuja, rhododendron), berry cultivation, strawberries, ornamental crops and various pot plants, etc. Application of the nematodes is safe for the user and fast and effective, when applied in the right manner.

After application, the parasitic nematodes actively hunt for the larvae and penetrate them. The nematodes then feed on the contents of the larvae, releasing certain bacteria from their intestinal tract. These bacteria convert tissue from the host into substances that are easy for the nematodes to absorb. The larvae die within a few days. The population development of the nematodes within the host population is dependent on the number (dosage) applied and the size of the host population. In this regard, it is important that Larvanem and Entonem be applied on uncovered, moist soil.


•Minimum soil temperature of 12°C
•Effective in combating larvae and pupae
•Dosage 500 million per 1,000 square metres


•Minimum soil temperature 8°C
•Effective in combating larvae
•Dosage 500 million per 1,000 square metres


•Watering can, sprinkler, backpack spray unit or vehicle-mounted spray unit, trickle irrigation
•Remove all strainers to prevent blockages
•Spray nozzle opening: at least ½ mm (500 microns)
•Pressure: max. 12 bar
•Mix continuously in order to prevent nematodes sinking to the bottom
•Spray over soil surface
•Water the crop (with a sprinkler) before and after application
•Keep soil sufficiently moist for the first two weeks after application


•Apply to moist uncovered soil
•Open ground › Spray/use sprinkler, trickle irrigation
•Container cultivation › Spray/use sprinkler, trickle irrigation, watering can rose


•Do not cover exterior/bark › obstructs entry into the soil
•Prevent occurrence of dry spots (the formation of raised spots during trickle irrigation) › black vine weevils seek out drier spots, while parasitic nematodes prefer moist soil
•Check the ends of the trickle irrigation hoses to verify that the nematodes are evenly distributed over the whole system.
•If necessary, repeat the treatment during the development of the larvae (autumn and spring).