Exhibitline sk is supplied as ‘Infective Juveniles’ of Steinernema kraussei. These seek out suitable hosts by swimming in the thin film of water on soil particles, and they locate hosts by detecting carbon dioxide and other waste products. Once they find a host, they enter the body cavity through the mouth, anus or spiracles, and release bacteria (Xenorhabdus sp.) into the host’s body cavity. These bacteria kill the host within a matter of hours in warm conditions, and the nematodes then grow and reproduce within the ‘broth’, which they produce. The next generation of infective juveniles then leaves the dead host, and moves through the soil or compost in search of fresh hosts. Infected hosts generally become brown and flaccid as the infection develops, but once dead can be difficult to find in soil. The nematodes and the bacteria are active at temperatures as low as 5°C. This means that they can be applied to soil or compost even in cold conditions. The best time to use this product is in March to May or August to November when the larvae are active, but can be applied at any time during the year. Exhibitline sk contains living organisms that require special handling and application procedure.
Exhibitline sk contains Steinernema kraussei, an insect pathogenic (entomopathogenic) nematode species naturally endemic to the UK. This species has a real benefit in being more COLD-TOLERANT than other predatory nematodes. Exhibitline sk contains infective juvenile stages of the nematode used for the control of Otiorhyncus sulcatus, Black Vine Weevil, the larvae of which feed on plant roots in the soil. Adult weevils feed at night producing tell tale notches around the edges of leaves and flowers. The root feeding larvae cause more damage and weaken plants without indication. Slower growing Rhododendrons, Azaleas, Camellias and herbaceous perennials suffer particularly from vine weevil damage, as well as field crops and soft fruits: strawberries, raspberries, blackcurrants etc.
Steinernema kraussei was collected from woodlands in Fife in Scotland, but is endemic throughout Europe even up to high altitudes, hence its excellent tolerance to cold soil conditions. In trials, even December applications at less than 3°C resulted in 75% control by the following year, which is much better than many chemicals. It is a robust nematode species, giving consistent and high efficacy compared to other nematodes such as Heterorhabditis megidis and Steinernema carpocapsae.
The low temperature efficacy is a result of the species of nematode and its associated bacterium. Like other nematodes, it will give at least 4 weeks persistent effect, or more if vine weevil food is available. An additional advantage is that this species will also infect and kill pupae. It will go down into the soil and actively hunt for prey.
Application via T-Tape and Dripper Systems:Inaccurate placing of the product using this system can result in reduced performance, and a need to increase dosage. Please ask our advisors for guidelines. Drippers should be located close to root-zones
Exhibitline sk:Persists for approximately four weeks, larvae emerging from eggs laid after this time may be poorly controlled, unless sufficient food has been available for the nematodes to survive. Exhibitline sk will not control weevil eggs or adults.
Successful field results can be achieved with 1 million nematodes/m2. Ideally drench individual plants or spray root zone areas.
Spray timing for strawberries:Make the first application 6-8 weeks after planting, or onto plant crowns after topping in Autumn or Spring. Apply twice per year to obtain optimum performance.
Soft fruit field & tunnel crops: crop area spraying:Treat the whole soil surface under plants on each side of the row up to the limit of the root system. Water the nematodes into the top 5cm of soil after spraying for improved performance. Aim for 4 litres spray volume per square metre.
For pot-plants and container-grown stock, the dose varies with pot size. Use the following guide:
2. Number of pots treated (Do not over-water pots: aim for 1 l/m2 spray volume.)