We have just been introduced to Powder Fly Killing Bait in English, in Chinese I can't read it, could be ying tong iddel I po for all I know. Anyway it is the most efficient fly killer I have ever come across in my life. Just sprinkle some in the lid of an old butter container either on a mango stone or on its own, watch the flies swoop upon it, then start dancing, then die. So far we have only found one inconvenience with it, that is you have to sweep the dead flies up at least every half hour. It is made in China by the Bejing Greenleaf Century Daily-use Co. Ltd. in 5 grm packets and is sold here at 30RD$ a packet. I am told that it is only sold by itinerant walking around pedlars not in shops. We were told that their cucaracha killing powder is equally efficient and will be trying that next. If wanted I will keep you posted.