Watch YouTube video about control of termites with beneficial nematodes.
Introduction
In this blog post, we will explain how termites cause damage to homes, commercial buildings, fences, trees, and wooden structures, and how beneficial Steinernema carpocapsae nematodes can help to control termites naturally and effectively without harming humans, pets, wildlife, or beneficial insects.
What Are Termites?
Termites are social insects (Photo 1) that live in large underground or above-ground colonies. They feed primarily on cellulose found in wood, paper, cardboard, and plant material. Common termite species include subterranean termites, drywood termites and dampwood termites. Among these, subterranean termites are responsible for the majority of structural damage to homes, and commercial buildings because they live in the soil and continuously forage for wooden food sources in buildings.
Damage Caused by Termites
Termites consume significant amounts of wood from the inside out over several years, making infestations difficult to detect.
Common damage includes:
- Structural weakening of timber
- Hollow wooden beams
- Damaged flooring
- Sagging ceilings
- Cracked drywall
- Destroyed fence posts
- Damaged decking
- Weakened wooden furniture
- Loss of structural integrity
Signs of a Termite Infestation
Early detection can help prevent costly repairs. Inside buildings, look for these warning signs:
- Pencil-sized mud tubes: Mud tubes built by subterranean termites along foundations, walls, and crawl spaces. These tubes help termites maintain moisture while traveling (Photo 2).
- Hollow-sounding wood: Tap wooden beams, floors, or furniture. Wood damaged by termites often sounds hollow because they have eaten away the interior.
- Winged reproductive termites (alates): These termites emerge and swarm during warm, humid weather to establish new colonies.
- Tiny, wood-colored pellets: Drywood termites produce small fecal pellets (frass) that accumulate beneath infested wood.
- Bubbling or blistering paint: Moisture associated with termite activity can cause paint to bubble, blister, or peel.
- Warped wood: Termite feeding can cause doors and windows to warp, making them difficult to open or close.
What Are Beneficial Steinernema carpocapsae Nematodes?
Beneficial Steinernema carpocapsae (Photo 3) are naturally occurring entomopathogenic (insect-killing) nematodes found in soils. These microscopic organisms actively search for susceptible insect hosts, including termites living in moist environments. Unlike chemical insecticides, beneficial nematodes are safe for humans and pets, leave no toxic residue, and target insect pests without harming plants or the environment.
How Do Steinernema carpocapsae Nematodes Kill Termites?
Beneficial Steinernema carpocapsae nematodes actively search for termites in the soil and enter into the termite through natural openings such as the mouth, anus, or spiracles. Inside the termite body, the nematode releases symbiotic bacteria (Xenorhabdus nematophila), which rapidly multiply and cause septicemia. The infected termites usually die within 48- 72 hours depending on temperature, moisture, and termite species. The nematodes then reproduce inside the dead termites. After the food source is depleted, a new generation of infective juvenile nematodes emerges into the soil to search for additional termites or other hosts. This nematode cycle can continue as long as soil moisture and suitable hosts are available.
Effective Application Rate
For effective termite control, apply 25,000 Steinernema carpocapsae infective juveniles per square foot to areas infested with termites using a watering can (Photo 4). For localized treatments around termite galleries, stumps, or infested wood, apply enough nematodes to thoroughly saturate the target area. Higher application rates may be appropriate for heavy termite infestations or where soil conditions are less favorable.
How to Apply Beneficial Nematodes
Proper application is essential for successful termite control with beneficial nematodes. Before application, thoroughly water the soil to ensure it is moist, as moisture allows the nematodes to move efficiently toward termite galleries; avoid applying to dry soil.
Mix the nematodes with clean water, and keep the suspension agitated throughout application to prevent the nematodes from settling. Apply the mixture during cool conditions, such as early morning, late afternoon, evening, or on cloudy days, and avoid direct sunlight because ultraviolet (UV) light rapidly reduces nematode survival.
Focus applications on areas of known or suspected termite activity, including foundation walls, tree stumps, wooden fence posts, landscaping timbers, termite tunnels, and the soil surrounding infested structures. After application, maintain consistently moist soil for 7–14 days to help the nematodes survive, establish, and locate termite hosts. Avoid waterlogging the soil, but do not allow it to dry out during this period.
For maximum effectiveness, apply when soil temperatures are between 15 and 30°C (59–86°F), soil moisture is adequate, UV exposure is minimal, and drought conditions are absent. Also, avoid applying nematodes immediately before heavy rainfall, which may wash them away from the treatment area.
Can Nematodes Eliminate an Entire Termite Colony?
Beneficial nematodes can significantly reduce termite populations, particularly in localized infestations and around soil-accessible galleries. However, they should generally be viewed as one component of an Integrated Pest Management (IPM) strategy rather than a guaranteed stand-alone solution for eliminating large, established colonies. Combining nematodes with moisture management, removal of wood-to-soil contact, regular inspections, and, where necessary, professional termite treatments provides the most reliable long-term protection.
Conclusion
Termites are silent destroyers capable of causing severe structural damage before homeowners realize an infestation exists. Early detection combined with environmentally responsible management can greatly reduce the risk of costly repairs. Beneficial Steinernema carpocapsae nematodes provide a safe, natural method for suppressing termite populations in soil-accessible areas. By infecting termites with naturally occurring symbiotic bacteria, these microscopic allies help reduce pest numbers without the environmental impact associated with many conventional insecticides. When applied at the recommended rates, under moist conditions, and as part of an integrated termite management program, beneficial nematodes can be an effective tool for sustainable termite control while protecting people, pets, and the surrounding ecosystem.