SOLUNEMA - Box tree moth - Nematodes (SC)

Carpocasae nematode treatment to control Colorado potato beetle larvae

The box tree moth is a moth native to East Asia. It has become a real plague for box trees in France and other parts of Europe. Its larva, or caterpillar, feeds on boxwood leaves, causing considerable damage. In the event of a massive infestation, it can even cause the death of the shrub.

Steinernema Carpocapsae (SC) nematodes are microscopic worms that are used as a biocontrol treatment against Colorado potato beetles.

When applied to the leaves of a box tree infested by box tree moth caterpillars, the nematodes actively search for their prey. Once in contact with a caterpillar, the nematodes penetrate through the natural orifices of the insect. Once inside, the nematodes release specific symbiotic bacteria which multiply rapidly and cause the death of the caterpillar.
The action of nematodes against box tree moth caterpillars is considered an effective and environmentally friendly method of biological control , as it specifically targets the pest without harming other beneficial organisms or humans.

How to Use Nematodes to Control Box Tree Moth Caterpillars

Treat as soon as the caterpillars appear: The box tree moth can generally have 2 to 3 generations per year, although this may vary depending on weather conditions.
The first cycle usually begins in the spring, when temperatures begin to rise. The second cycle begins when these new first generation butterflies lay their eggs with the appearance of caterpillars in early summer. Under favorable conditions, a third cycle can occur in late summer or early fall.

1. Identify the problem

Leaf damage: The first signs of infestation are usually partially eaten leaves woven together with silken threads. Over time, shrubs can become completely bare.
Presence of caterpillars: Box tree moth larvae are green caterpillars with a black line along each side of their body and a black head. They can often be found inside sheets rolled up or woven together.
Droppings: The caterpillars leave behind dark green droppings which can often be found on the leaves or at the base of the shrub.
Presence of butterflies: Adults are white moths with a brownish border along the wings. They are generally active from dusk until dawn and can be attracted to light.

2. Preparation of nematode solution

Bring nematodes to room temperature 30 minutes before use. To mix the nematodes well, it is recommended to dilute the entire jar or sachet in a small container of clean water at room temperature by pre-diluting the nematodes before mixing them. Stir this mixture well and allow the contents to dilute for 5 minutes. If there are any lumps left, that's okay, but it could clog the nozzles. Then, pour this preparation into your watering can or sprayer and add the rest of the water (between 15°C and 25°C). Mix again.

3. Spray application or watering of nematodes on boxwood

Before applying the nematode solution to boxwood, moisten the foliage with a light watering. This will allow the nematodes to move more easily to their prey. Since nematodes do not have legs, they use moisture in combination with foliage particles to move around. Spray while continuing to agitate the mixture to prevent the nematodes from ending up all at the bottom of the sprayer or watering can.

4. Continue humidification

Nematodes need a moist environment to move to their prey. To maintain their effectiveness, continue to water your boxwood regularly.

5. Monitor results

Steinernema Carpocapsae nematodes act fast enough to control caterpillar larvae. You should notice a decrease in the caterpillar population after a few days. However, be careful, as the nematodes treat the caterpillars, so you might still see moths. If the caterpillars persist, it is necessary to repeat the treatment.
It is important to follow application instructions for best results in treating box tree moth with Steinernema carpocapsae nematodes.

How do nematodes work?

The nematodes move in search of the caterpillars they parasitize. When they find them, they enter their body through natural channels and multiply inside, thus leading to their death within a few days.
Inside the caterpillar, the nematodes release a bacterium that quickly kills it. This bacterium also helps turn the caterpillar into food for nematodes. This food allows the nematodes to complete their development cycle.