Effect of pesticide application intensity on arthropod community in pear orchard in Hexi area
This study aimed to clarify the arthropod community structure and the effects of varying pesticide application intensity on this structure in the Hexi area by employing a visual observation method.This method was utilized to investigate the arthropod communities in pear canopies of 6 pear orchards under different pesticide application intensities in the Ganzhou District of Zhangye.The population dynamics and niche characteristics of major pests and natural enemies were further analyzed.The results revealed a limited diversity of arthropods in the pear canopy in the Hexi area.Tetranychus urticae was identified as the dominant pest and Stethorus punctillum was determined to be the dominant predatory natural enemy.The niche overlap value between the two species was high,with an obvious following effect.In comparison to the low-intensity management orchard,the diversity of the arthropod community in the high-intensity management orchard decreased significantly,the dominance index increased significantly,and the occurrence of T.urticae during its peak infestation period increased significantly.Years of chemical pesticide application against fruit-boring pests have resulted in a notable reduction in the diversity of arthropods within the orchard and caused the resurgence of harmful mites.This study offers a valuable foundation for the scientific management of major pests in pear orchards in the Hexi area.
NETL
NSTL
万方数据
