The Survery Of Species And Biological Characteristics Of Bark Beetle In Turpan

Apricot tree as an important part of xinjiang characteristic fruit industry,not only can increase the farmers income,improve the economic benefit,at the same time to increase the forest coverage rate,maintain ecological environment also has a positive effect.In recent years,mainly bark beetles drill decay pests occur large area,almond industry caused serious threat.According to the advices,the average risk ratio of apricot gardens over 10 years was 19.4%,the individual hazard rate was 32%,the highest mortality rate was 12.6%,it poses a serious threat to the apricot industry.The author apricot tree bark beetles in turpan area of research.The specimens were identified by morphological identification,learn about the variety of apricot bark beetles in turpan area,Investigate the damage characteristics and rules of the tree body in different orientation and location;At the same time,Use the aggregation metric method,Determine the distribution characteristics of the bark moth space,conduct laboratory experiments to study the control of the enemy bark beetles,to provide the theoretical basis for the comprehensive prevention and control of the bark beetles;Link the data identified in the spatial distribution survey to the field sample survey,the most reasonable sampling method and the sampling number are obtained,lay the foundation for future research.(1)Appraisal the specimens of bark beetles by Beijing forestry university,professor Li.turpan apricot tree bark beetles species are: Scolytus seulensis,S.rugulosus,S.Sp,Ernoporus sp.A detailed description of the biology of the bark beetle,especially the tunnels,a reference is provided for the field identification of the species.(2)When the apricot garden is extensive management,With the increase of tree age,Victimization rate and the pest index higher;Tree four directions of the average population quantity is in turn: west>north>south>east,the average population quantity differences of extremely significant level;The average population quantity from different parts of the tree is in turn: main branch>side branch>main trunk>vice-side branch,the average population quantity differences of extremely significant level.In the larger apricot park,the weak tree is the source of the damage to the bark beetle,therefore,it is important to strengthen the scientific management of apricot park,pay attention to tree potential health,and cure the weak tree body in time.In the prevention and control work,the main branch of the host,west and west of the host,should be focused on the use of chemical agents or traps.(3)5 different ages of apricot were surveyed,using aggregate index test and regression analysis on the data processing,the results indicated that apricot bark beetle adult spatial distribution was aggregated distribution,the basic component of distribution is the population,the aggregation distribution was density dependent,and the aggregation density increased with the increase of population density.When the population density is small,the population aggregation is caused by the interaction of biological factors and environmental factors.When the population density is large,the environment is the main cause of population aggregation.Compared with previous research,the more determined the dynamic regularity of bark beetles,determine the optimal sampling method and its investigation for late sampling volume,as well as the plant to predict lay the foundation.(4)The sampling results showed that more than 10 years old with five sampling points,10 years and 10 years of age following using checkerboard sampling can better represent the whole garden survey.When sampling required accuracy is higher,the more the number of sampling,and with the increase of population density by extracting the sample gradually reduce;Along with the increase of the average number of population sample survey by the number of gradually reducing,the precision requirement,to extract the sample number also has bigger difference.(5)State at room temperature conditions,the one Thanasimu lewis of Scolytus seulensis adult daily feeding amount is 30 or so,its prey on quantity but also the influence of interspecific competition.In practice,the combination of natural enemies and pheromones can be used to protect the environment and reduce the chemical pollution.