THE APPLICATION OF ENTOMOPHAGOUS NEMATODE TAISHAN No.1 AGAINST PEANUT GRUBS Characterization of female sex-pheromone in Holotrichia parallela (Coleoptera, Scarabaeidae, Melolonthinae) of Qingdao population and their application in the field Toxicity and control effect of seven insecticides to Holotrichia parallela