Influence of climate conditions on the flying behavior of <i>Platypus quercivorus</i> (Murayama)

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  • カシノナガキクイムシの飛翔に及ぼす気象の影響
  • カシノナガキクイムシ ノ ヒショウ ニ オヨボス キショウ ノ エイキョウ

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<p>Ambrosia beetle traps were installed in the Suzuka Youth Forest Park, Mie Prefecture, from July to October, and the number of captures of oak ambrosia beetles Platypus quercivorus (Murayama) was investigated daily. From the results of the analysis of the relationship between the number of captures and climate conditions, it is conceivable that this beetle quickly flies to a new host tree after escaping from the previous tree. In addition, it was established that this beetle has difficulty flying not only on low-temperature days, but also on high-temperature days. Furthermore, the number of captures decreased in the period with longer daylight hours and lower precipitation (the end of July to the end of August), and the number of captures increased sharply on a day following a day with heavy rainfall. Therefore, it is thought that this beetle refrains from flying in the midsummer season during dry conditions and high temperatures, and that they actively fly in humid seasons such as the rainy season (mainly June) or periods of autumn rain (mainly September). It was also confirmed that this beetle tends to fly more readily on days with a gentle breeze than on windless days or on days with a strong wind. As a result of distinguishing between the Pacific Ocean type and the Sea of Japan type according to the number of circular holes on the female mycangia, it became clear that both types are mixed in this investigation area. Regarding the beetles captured in September, the relationship between the ratio of the Pacific Ocean type and climate conditions was analyzed. The results suggested that there was no major difference in climate conditions that made flight easier between both types. From the above, it can be considered that the behavior of P. quercivorus in the rainy season has become more active as the temperature of the rainy season has increased due to global warming, which may be one of the reasons for the increase in Japanese oak wilt disease.</p>

Journal

  • Applied Forest Science

    Applied Forest Science 29 (1), 23-31, 2020-02-29

    The Society of Applied Forest Science

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