Does the subject want to ask "can litsea cubeba trees put fish ponds to kill insects and is it poisonous?" No, it's nontoxic. According to the information of Baidu Encyclopedia, putting the tree in the fish pond can prevent the fish thieves from getting off the net and stealing fish, and can also prevent the fishermen from killing insects. Putting the tree branches in the fish pond can increase the water environment and is non-toxic. Litsea cubeba, also called Shanjijiao and ShanCang Shu, is the fruit of Shanjijiao, a Lauraceae plant, which is mostly distributed in Jiangsu, Zhejiang and other places.