Emergence and landing positions of Dendroctonus valens in Heilihe
Author of the article:LIU Yi-Zhou;GAO Bing-Tao;ZHANG Shao-Peng;REN Li-Li;LUO You-Qing
Author's Workplace:Beijing Key Laboratory for Forest Pest Control, Beijing Forestry University, Beijing 100083, China; Emergency Management Bureau of Ningcheng County, Ningcheng 024200, China
Key Words:Dendroctonus valens; behavior; pest management
Abstract:
[Objectives] To improve the prevention and control of Dendroctonus valens by determining the emergence and landing
positions this pest. [Methods] In
Heilihe National Natural Reserve, Inner Mongolia Autonomous Region, China, a
ground and stem eclector trap was used to count the emergence positions of D. valens. The landing position of attracted insects was also counted during the
emergence period. [Results] Most D. valens overwinter at the root
level where adults bite the root bark and burrow upward through the soil to
ground level after overwintering. There were very significant differences in
the proportion of D. valens that emerged at different distances
from infested pines (P<0.001). Most, 79.90%±16.99%, emerged from an
area within a 0-50 cm radius of infested pines with the remainder 17.77%±14.12%
emerging within a 50-100 cm radius. Few adults emerged from the trunk. The
proportion that landed at different heights on the trunk was also significantly
different (P<0.001). Most
41.09%±4.25%landed at a height of 0-50 cm from the ground, with a smaller
proportion 27.47%±4.31% landing at a height of 50-100 cm. Relatively few landed
at heights of 100-150 cm within a radius of 0-150 cm of a pine tree. [Conclusion] In Heilihe National Natural
Reserve, D. valens mostly damages pine roots, and usually emerges within a 0-50 cm radius
of pine trees. Therefore, covering the ground within 0-50 cm of pine trees with
plastic sheeting should improve the control of this pest with fumigation. If
possible, the ground should be covered to a distance of 100 cm from each trunk. D. valens generally lands on
pine trunks at a height of 0-50 cm from the ground, so traps should be hung as
low as possible.