首页|Invasion of Red Turpentine Beetles led to the increase of native trunk-boring beetles in Chinese pine stands
Invasion of Red Turpentine Beetles led to the increase of native trunk-boring beetles in Chinese pine stands
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NSTL
The Red Turpentine Beetle (Dendroctonus valens) is a forest pest that invaded China from North America. There is few research on the damage characteristics of D. valens in China, particularly given the changes in its biological and ecological characteristics compared to its original habitat. The impact of this exotic bark beetle native insects is also insufficiently studied. In our study, we felled 12 damaged Pinus tabuliformis trees, categorizing them into three stages of attack: green, yellow, and red. Native trunk -boring beetles and natural enemy insects colonizing the roots, trunks, and branches were counted and identified. Our observations revealed a significantly higher density of D. valens in the green -attack stage at the base of Chinese pine trunks compared to the other stages (P=0.028). At the roots, densities of D. valens in the green -attack stage significantly differed from those in the red -attack stage (P=0.048). We identified a total of 13 species of native trunk -boring beetles and 2 species of natural enemy insects colonizing the injured trees. Native beetle abundance, species richness, and Shannon diversity indices increased considerably from the green to yellow stages (with almost all significant differences in roots, trunks and branches). The attack stages were the most significant factor in determining community composition, followed by the relative moisture content of the phloem (including cambium), trunk/branch diameter, relative height above ground, and the section of the tree (trunk/branch). Our research revealed the colonization times and locations of these species as well as the temporal -spatial niches of each species. Additionally, our findings demonstrated that D. valens was more active, and colonized the hosts earlier than all native trunk -boring beetles. Most native species exhibited neither spatial overlap nor competitive interaction with D. valens. Our survey did not identify any natural enemies of D. valens. The invasion by D. valens has resulted in increased mortality and degradation of Chinese pines, thereby creating favorable conditions for the proliferation of native trunk -boring beetles. We recommend the implementation of management strategies during the greenattack stage in newly invaded areas to effectively control D. valens, which could also mitigate its impact on local insect populations. Felling trees in the yellow and red stages does not contribute to the control of D. valens.
NSTL
