The Management Of Dioryctria Abietella And Dioryctria Mongolicella

Korean pine Pinus koraiensis Sieb et Zucc is one of the native important trees,It is the excellent species of woods,the vintage materials and its seeds possess of very high economic value and role of health care.In recent years,because of the shortage of the seeds and timber,the seed prices of the Korean pine continue to rise around the world.So,the eastern mountain area of Jilin Province have already strengthened currently the management of the Korean pine forests and vigorously cultivated new plantations.With the changes of forest stand conditions and the composition of forest stands,the Korean pine pests increasingly serious harm also, the Korean pine insect pests in some regions damaged as high as 80%,or total destruction of the pine growth and seed yield.Among the pests of the pine branches and cones,the Dioryctria abietella and Dioryctria mongolicella are the main pests,is also the main damage groups in the eastern mountain of Jilin Province.Auther surveyed the activity,the morphology and the ontogeny condition of the Dioryctria abietella and Dioryctria mongolicella in Huangnihe,Dunhua city from May to September in 2007,Determined the biological characteristic and the Life cycle of two pests;And choose 3 plots of 30yr for the controlling test.D.abietella occurred a generation per year,3～4 instar larvae winter over inside the cocoon in 2yr cone and the shoot,.In late April the following year,when the temperature rises,gradually regained consciousness and began activities.In late May the larvae mature and begin to pupate.Several stages of this pest very disordered,in mid-June to late July they can be seen the different instars of the larvae,the pupa,the adult and the egg.D.mongolicella occurred a generation per year,first instar larvae winter over inside the shoot and truck.In late April the following year,the larvae start activity.In late June the larvae mature and begin to pupate.In mid-July the adult begin emergence.At the early august,the new larvae borer around the phloem form the wound of branches and trunk.The test indicate:useing the 1.2%matrine EC,48%chlorpyrifos EC and 20%carbofuran EC,the mortality exceeds 75%.So,we can use the 1.2%matrine EC,48%chlorpyrifos EC and 20%carbofuran EC control the pest with the spray in the emergence stage,but,considered the environment and the forest ecosystem,the 1.2%matrine EC is the best choose;10%imidacloprid WP diluted by 10 times,10 ml/20cm Note stem diameter at breast height control,the effect reached about 70%,can be applied in the production practice.Taking into account the environment and forest ecosystems,and prolonged use some kind of Pharmacy,will pest resistance,reducing effect.Therefore,chemical control only as a contingency control or other control methods for use.Mechanical control,through the killing lamp on the pest Occurrence predictionthe,adults living habits more accurate grasp of the emergence,the adult period of time and activities for the prevention,treatment provide the basis for timing.The use of insecticidal lamps broad spectrum insecticide,and can prevent other pests;compared to the natural enemies of security,while saving a lot of manpower,reduce human,animal poisoningand reduce environmental pollution,with significant economic,ecological and social benefits.Natural enemies of organisms,the release of Trichogramma effect for about 45%,probably due to host eggs size and also differences release time,method of Trichogramma effect to a certain extent affected the mountains due to difficult terrain,the relative height difference,and pines are usually higher,the effect of Trichogramma there are also some negative impact.