Abstract:
Objective To clarify the population structure of Tomicus species in Yunnan, and to elucidate its succession law so that to provide theoretical guidance for the management of Tomicus spp.
Method Surveying, sampling and identifying Tomicus in occurrence areas of Yunnan, and comparing the population structures of Tomicus spp. between 1990s and 2010s at 3 spots (Shilin, Anning, and Qiubei).
Result There are four Tomicus species in Yunnan Province, T. yunnanensis occupied 36.6% of the sampling population, T. minor occupied 38.1%, T. brevipilosus occupied 19.7%, and T. armandii occupied 5.6%. Recently, the population structure of T. yunnanensis and T. minor changed significantly compared with that in 1990s. The percentage of T. yunnanensis in population declined from 92.1% in 1990s to 42.7% in 2010s, correspondingly, the percentage of T. minor in population increased from 7.9% in 1990s to 57.3% in 2010s.
Conclusion In Yunnan Pvrovince, after 20 years' population succession, T. yunnanensis is no longer the only Tomicus species damaging pine forests, the dominant Tomicus species are both T. yunnanensis and T. minor, indicating that pine forests in Yunnan, especially Pinus yunnanensis forest, are in sub-healthy even unhealthy situations. The results provide a new scientific data for Tomicus monitoring and control in Yunnan province.
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