Study On The Occurrence Characteristics And Control Countermeasures Of Major Forest Pests In Guizhou Province

Invasive forestry pests are an important category of forestry pests,with strong ability to reproduction,ecological adaptation,transmission and diffusion,which poses a serious threat to biodiversity and ecological safety.Invtrusion forestry pests has become the main aspect of forestry pest prevention and control in Guizhou Province,and spread rapidly,which needs to carry out research.This paper selected six kinds of forestry invasion pests,including Bursaphelenchus xylophilus 、 Eupatorium adenophora、Corythucha ciliate、Solidago canadensis、Eupatorium odoratum and Leptocybe invasa,to carry out research,which provides reference for the prevention and control of invasive forestry pests in Guizhou Province.The main conclusions are shown below:1.Characteristics of occurrence.The area of harm has been greatly reduced,Leptocybe invasa has disappeared,but Bursaphelenchus xylophilus has been explosive growth in the local area.The invasion area is wide,only Liupanshui is not found in 9 areas,and more than 2 species occur in 5 counties,such as Pingba,Huaxi,Libo,Luodian and Wangmo.The degree of occurrence is mild,and the invasion mode is mainly introduced with the transfer of green seedlings,and the pressure of transmission and diffusion is great.2.Effectiveness.The main prevention and control measures are physical prevention and control methods.The effect of Leptocybe invasa is the best.The results showed that there were significant effects on Corythucha ciliate,Eupatorium adenophora and Eupatorium odoratum,Solidago canadensis has achieved some results,but the overall trend is still spreading.The effect of Bursaphelenchus xylophilus is not obvious.3.Problems and difficulties.Six forest pests are faced with the problems of simple methods and insignificant effect.Both Bursaphelenchus xylophilus and Eupatorium adenophora are faced with such problems as high risk of transmission,weak ability of early warning and difficulty in early control.The prevention and control loopholes caused by the transport of seedlings are faced with Corythucha ciliate.Solidago canadensis,faces problems such as lack of understanding and lack of publicity.4.Measures.The prevention and control of Bursaphelenchus xylophilus should be carried out in spring,autumn and all year round.The prevention and control of Corythucha ciliate should breed the sycamore varieties with strong resistance to planting,and strengthen the sampling inspection and law enforcement of sycamore seedlings,especially the sycamore seedlings.It is necessary to replace the tree species in time and stop the cultivation and planting of the eucalyptus strains that are vulnerable to the damage of Leptocybe invasa.Alternative control methods should be actively developed for the control of Eupatorium adenophora、Solidago Canadensis and Eupatorium odoratum.The prevention and control methods of the six invasive forest pests should be formulated according to the characteristics of their occurrence and development,actively carry out scientific research,strictly quarantine blockade,strengthen monitoring and early warning,and extensively carry out socialized prevention and control.