Nemasys L

Root damage from black vine weevil larvae can be devastating in nursery and berry crops. Nemasys L offers a powerful and natural solution to this underground threat by using Steinernema kraussei, an insect-pathogenic nematode that actively seeks out and eliminates vine weevil larvae. This biological control agent provides up to four weeks of reliable protection and is safe for crops, people, and beneficial insects.

Whether applied to potted ornamentals or open field berries, Nemasys L integrates easily into any pest management plan. It functions under a broader range of soil temperatures than many other biological options, giving growers extended flexibility and season-long control.

How Nemasys L Works

Active Pest Hunting and Biological Suppression

Once introduced into the growing media or soil, the infective juvenile nematodes move through the thin films of water surrounding soil particles. They detect vine weevil larvae by sensing carbon dioxide and other chemical cues.

• After locating the larvae, the nematodes penetrate the insect via natural openings.

• Once inside, they release symbiotic bacteria that cause septicemia, killing the larva within 12–24 hours under optimal conditions.

• The nematodes then reproduce inside the cadaver, and new juveniles spread out in search of more hosts.

This natural biological process ensures targeted pest elimination without disrupting the surrounding ecosystem.

Flexible Temperature Range for Early and Late Season Use

Nemasys L can be applied at lower temperatures compared to other nematodes:

• Minimum soil temperature: 5°C (41°F)

• Maximum soil temperature: 26°C (78.8°F)

• Ideal pH range: 5–7

This broad operating range allows growers to treat crops early in the spring or late in the fall, when other nematodes may be inactive.

Target Pest

Nemasys L is highly effective against:

• Black vine weevil (Otiorhynchus sulcatus) – a common pest in berries and ornamental plant production

Infestations by this pest often go unnoticed until significant root damage has occurred. Using Nemasys L proactively can prevent crop stress, yield loss, and plant death.

Application Guidelines

Best Practices for Maximum Effectiveness

• Apply in early morning or late evening to protect nematodes from heat and UV exposure.

• Ensure soil or growing media is moist before and after application.

• Keep soil moist for 3–4 weeks following treatment to support nematode movement and survival.

Mixing and Spraying Instructions

• Mix the entire contents of the pack with clean, cool water (approximately 20–22°C / 68–72°F).

• Apply using ground sprayers or irrigation systems with nozzles ≥0.8 mm.

• Remove all fine filters and maintain constant agitation during application.

• For spray use: apply with at least 4 liters/m² of water.

• For foliage drench: apply with a lower volume and follow up with at least 1 liter/m² within 30 minutes to wash nematodes into the soil.

To reduce settling, you may add 0.4% carboxy-methyl cellulose (wallpaper paste) to the mix—solution still must be used within 4 hours.

Application Timing

Use Nemasys L when vine weevil larvae are active in the soil, typically:

• Spring: From early March as temperatures rise above 5°C

• Late Summer to Autumn: From August to October when eggs hatch and larvae begin feeding on roots

Routine treatments are recommended on new nursery material or in areas with a known history of vine weevil presence.

Compatibility and Safety

• Avoid mixing with fertilizers, pesticides, or wetting agents unless confirmed compatible.

• Do not apply chemical pesticides 1 week before or 2 weeks after using Nemasys L unless approved.

• Fertilizer use before or after application is acceptable if not mixed directly with the nematodes.

Delivery and Packaging

Nemasys L is available in:

• 50 million nematodes

• 250 million nematodes

Each pack is supplied in sealed trays with an inert carrier for ease of mixing and consistent dosing.

Storage and Handling

• Use product as soon as possible upon delivery for best results.

• Store at 4–8°C (39–46°F) if immediate use is not possible.

• Do not freeze.

• Remove outer packaging to allow air circulation around each pack.

• Use entire contents of each pack at one time; do not divide doses.

Keep away from direct sunlight and heat to maintain nematode viability.

Final Words

Nemasys L offers growers a natural and effective method to control black vine weevil larvae in berries and ornamental crops. With its ability to function at low soil temperatures, Nemasys L extends the season for biological control, making it ideal for early or late applications. Safe, easy to apply, and reliable, it provides long-lasting root zone protection with no residue or environmental risk.