Studies on the Emergence, Replenishing Feeding Methodes of Adults of Monochamus alternatus in the Area of Nanjing and Its Control

Two years research results showed that the emergence of the adults of Monochamus alternatus started in the first and second ten days of May in 1991 and 1992 respectively. The peak emergence stage showed in the last ten days of May and the first tendays of June,and the second peak emergence stage occurred in the second ten days of June,and the emergence period ended in the second and last ten days of July in 1991 and 1992.After emergence the adults conducted the replenishing feeding of 1～3-year-old shoot ofthe pines,the adults fed on different species of coniferous trees.Their preferrence is in orderas follows:Pinus serotinaP. massonianaP. armandiP. densifloraP. massonianax P. thunbergiiP. taedaCedrus deodaraP. thunbergiiP. rigidaP. elliottiiP.palustris, while in the area of Nanjing the order is:Pinus massonianaP. densifloraCedrus deodaraP. taedaP. elliottiiP. thunbergiiSabina viginianaCun-ninghamia lanceolata.The first and second peak of the emergence are the most suitable time for control. Atthat time spraying twice of pesticide(3% of Sumithion and 1% of MPP)in the last ten daysof May and the second ten days of June respectively can significantly reduce the population ofthe beetles and the number of dead pine tree damaged by Bursaphelenchus xylophilus.