Compounds of formula (I)
wherein R and R' are the same or different and each represent chloro or fluoro; R2 is chloro, bromo or trifluoromethyl; provided that when R and R' are both chloro, R2 is trifluoromethyl; or veterinarally-acceptable salts thereof, are effective in reducing the population of manurebreeding insects.
式(I)化合物
其中 R 和 R' 相同或不同,各自代表
氯或
氟;R2 是
氯、
溴或三
氟甲基;但当 R 和 R' 都是
氯时,R2 是三
氟甲基;或其兽医可接受的盐,可有效减少粪便繁殖昆虫的数量。