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New method for rapidly estimating population densities of the concealed wood‐borer M onochamus alternatus ( C oleoptera: C erambycidae) in the field
Author(s) -
Wang XiaoYi,
Yang ZhongQi,
Situ ChunNan,
Wang Jian,
Fu FuYong
Publication year - 2016
Publication title -
entomological research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.421
H-Index - 20
eISSN - 1748-5967
pISSN - 1738-2297
DOI - 10.1111/1748-5967.12155
Subject(s) - monochamus alternatus , biology , larva , longhorn beetle , population , diameter at breast height , population density , infestation , trunk , botany , ecology , demography , sociology
To rapidly estimate pine sawyer, M onochamus alternatus H ope, population densities in forests, the vertical distributions of M . alternatus oviposition sites and larvae on infested M asson pines ( P inus massoniana L amb.) were studied. Results showed that the number of oviposition sites on sections of trunks between 0 and 2 m above ground was significantly greater than on sections of trunk above 2 m, and the vertical distribution had a significant logarithmic relationship with trunk height. The larval number of M . alternatus on dead infested trees had a significant difference among heights of trunks. Sections on trunks at 2–4 m usually contained the largest number of M . alternatus larvae, while the number of larvae on trunks above 10 m declined significantly, as well as in the 1 m section of trunk at the base. The vertical distribution of M . alternatus larvae on dead infested pines showed a distinct parabolic relationship with trunk height. The number of oviposition sites of M . alternatus on infested M asson pine trunks revealed a significant exponential relationship with the diameter at breast height ( DBH ) of trees. A significant positive linear relationship also was observed between M . alternatus larval number and DBH on the host pine trees, as well as between the numbers of larvae and oviposition sites on an individual tree. The total number of larvae in an infested tree could be calculated easily using an established equation, through counting the number of oviposition sites at 3–4 m of trunk aboveground. This study developed a practical method for rapid estimation of M . alternatus populations.