A new insect pest of the Chinese red pine(Pinus tabulaeformis)in Beijing:a web-spinning sawfly Cephalcia nigrotibialis and its biology

Yu Guoyue;Wang He;Zhang Zhenghao;Wang Changmin;Wang Yongmin;Liu Xi;Institute of Plant and Environment Protection,Beijing Academy of Agriculture and Forestry Sciences;Forest Protection Station of Beijing;Yanqing Forest Pest Management and Quarantine Station;

Cephalcia nigrotibialis;;morphology;;habit;;control;;colored sticky traps

The web-spinning sawfly Cephalcia nigrotibialis Wei was previously recorded from Shaanxi and Henan Provinces.It was found as a new insect pest on the Chinese red pine(Pinus tabulaeformis)in Yanqing County,Beijing.It has one generation per year and overwinters as matured larva in soil cell,with average population of20.7 larvae/m2 about 3 cm under the soil.The overwintered larvae begin to pupate at the beginning of June and adults emerge at the last 10-days of June.The female adults lay eggs on the needle of the biennial branch.The larvae cut down the pine needle before eating with silk nest along the branch.The infestation peak is in August and September.The colored sticky traps experiments show that adults come to all 5 colors(red,blue,yellow,white,and black)without significant difference among them.Now the red sticky trap has been in C.nigrotibialis control in Yanqing County.The paper described morphology of four stages,provided with color pictures,and discussed its distribution and causes of heavy infestation.