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Organic solvent preservatives. Essays on the ecotoxicology of new formulations
1991 - IRG/WP 3642
The knowledge on the ecotoxicological profile of wood preservatives become more and more important. The acute toxicity against aquatic organisms was examined for oil-borne preservatives, based on combinations of new fungicides (Tebuconazole, Propiconazole, Dichlofluanid) and insecticides (Permethrin, Cyfluthrin). These tests were conducted with fish, daphnia and algae. In principle the different formulations showed similar effects. The results of active ingredients and solvents confirmed the high sensitiveness of daphnia as test organisms. Criteria for hazards for the environment are presented and discussed.
H-W Wegen


Suitability of cyfluthrin in wood protection
1992 - IRG/WP 92-3735
Cyfluthrin, a well-known and in agriculture and household widely used insecticide based on synthetic pyrethroides, is evaluated now concerning its suitability as insecticide in wood protection. An overview about the physical and chemical properties is given. Test results in accordance with European standards show the high efficacy and broad-spectrum activity of Cyfluthrin against wood rotting insects and termites. Important toxicological and ecotoxicological properties are summarised and a list of compatible, typical fungicides is given.
H-U Buschhaus


Glass splinters as physical termite barriers: Optimized material properties in use with and without insecticidal pretreatment minimizes environmental contaminations
1991 - IRG/WP 1476
The major advantage of physically acting barriers against termites using sand or cinder is to be impenetrable for a number of termite species by showing environmental compatibility in a high degree. The major disadvantage of these barriers is the ability of termites to build galleries over them. Glass or glass-like materials are showing optimum material properties: crushed to a particle size from 0.5 to 1.5 mm very thin layers (10 to 20 mm thickness) reliably prevent termite penetration of Reticulitermes santonensis (de Feytaud) and Heterotermes indicola (Wasman) in laboratory studies as well as the penetration of Coptotermes formosanus (Shiraki) in Japanese field tests. On the other hand, the extremely high affinity of pyrethroids to this type of material makes it highly suitable for a stationary pyrethroid-carrier. Gallery-building by termites is completly suppressed after superficial treatment of glass splinters with pyrethroids. The high affinity of pyrethroids to glass surfaces causes high contact insecticidal properties by minimizing leaching and biodegradation-effects at the same time.
M Pallaske, A Igarashi