Investigation of Dominant Species of White Grubs in Peanut Field and Field Control Techniques in the Eastern of Hebei Province

The dominant species and occurrence period of white grubs in peanut field in the Eastern of Hebei Province were investigated.The control effects of 3% phoxim pelletized granule 60 kg /hm2,30% chlorpyrifos CS 6 375 mL/hm2,3% furation pelletized granule 60 kg/hm2,Metarhizium anisopliae 600 million spores per hole,M.anisopliae 400 million spores per hole+30% chlorpyrifos CS 3 825 mL/hm2,M.anisopliae 400 million spores per hole+30% chlorpyrifos CS 2 550 mL/hm2 on white grubs were studied.The results showed that the dominant species was Holotrichia parallela Mltschulsky.The control effect could reach 77.01% by using 30% chlorpyrifos CS 6 375 mL/hm2,the damage index of peanut was only 3.61%,and the yield of peanut was 3 629.70 kg/hm2.The control effect of M.anisopliae 400 million spores per hole+30% chlorpyrifos CS 3 825 mL/hm2 was followed,while lower dose of pesticide was used,and the toxicity was lower.