After being probed for years, the hypothesis of the migration of ladybeetle cocinelle septempunctata L, in China was originally put forward by Mr. Chai Xiaoming. Furthermore it was not only theoretically proved, but also practically fit into the situation.Under the certain climatic conditions of surface and ground, there appears the migration of the ladybeetle. Therefore, when considering the control of northern aphis, we should think of the migration of the ladybeetle coming and also make use of them to co...