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R—8号是用来处理飞机播种造林的马尾松种子,为鼠、鸟的拒食剂,其中对鱼类有一定毒性的成分是福美双(Thiram)。对四种鱼的毒性试验表明,R—8号拒食剂对鱼类的毒性与福美双的毒性相近似。在飞播的常规及5倍用种量范围内,供试鱼苗无一死亡。在333倍用种量范围内,鲩鱼(Ctenopharyngodon idella)、鳙鱼(A-ristichthys nobilis)和非洲鲫鱼(Tilapiamossambica)也无死亡。在666倍用种量(含福美双1ppm)时鲩鱼、鳙鱼和非洲鲫鱼的死亡率分别为10、32.5和35%;东北鲫鱼对福美双比较敏感,在167倍用种量时即100%死亡。R—8号对鱼类的毒性,取决于福美双的含量。鱼类对福美双的耐受浓度为0.5—10ppm。而飞播时用 R—8处理种子,按每亩播100g 种子计算,每平方米仅有福美双1/666g,对鱼类不可能造成危害。
The R-8 is a masson pine seed that is used for aircraft seeding and is an antifeedant to rats and birds. Among them, the ingredient that is toxic to fish is Thiram. Toxicity tests on four species of fish showed that the toxicity of R-8 antifeedant to fish was similar to that of thiram. In the routine and 5 times the amount of flight seeding for the test fry without death. There was also no death of Ctenopharyngodon idella, A-ristichthys nobilis and Tilapiamossambica within 333-fold range. The mortality rates of catfish, catfish and African crucian carp were 10, 32.5 and 35% respectively at the 666 times of seed dosage (including thiram 1ppm), while the carp was more sensitive to thiram at 167 times %death. R-8 toxicity to fish, depending on the content of thiram. Fish tolerance to thiram at concentrations of 0.5-10ppm. The fly sowing with R-8 seed processing, sowing 100g per acre seed calculation, per square meter, only the United States Bi 1 / 666g, fish may not cause harm.