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首页> 外文期刊>South-East European Forestry >First Record of Dendrolimus pini Outbreak on Aleppo Pine in Croatia and Severe Case of Population Collapse Caused by Entomopathogen Beauveria bassiana
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First Record of Dendrolimus pini Outbreak on Aleppo Pine in Croatia and Severe Case of Population Collapse Caused by Entomopathogen Beauveria bassiana

机译：克罗地亚阿勒颇松上Dendrolimus pini暴发的首次记录以及由致病性球孢白僵菌引起的严重人口崩溃案例

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Background and Purpose: The pine-tree lappet moth, Dendrolimus pini, is a widely distributed pest in Europe that can cause serious needle defoliation on pines, with outbreaks occurring over large geographical areas. In Croatia the presence of D. pini was recorded only in the continental part, but not in a high level of abundance, and the outbreak of the population has never been recorded so far. Materials and Methods: In autumn 2014 an unexpected and complete defoliation on Aleppo pine (Pinus halepensis Mill.) occurred in the vicinity of Skradin, near ?ibenik, and was followed by defoliation in summer and autumn 2017 in Tela??ica Nature Park, Dugi otok. Infested areas were inspected and overwintering larvae in soil surface were counted in order to estimate the population and assess whether the critical number of the population has been exceeded. Specimens were collected and transferred to the Laboratory for Entomological Analysis in the Croatian Forest Research Institute for further laboratory analysis. Results: Since more than 10 larvae per m2 of soil surface were found, it was concluded that an outbreak occurred at both localities. In both cases natural antagonists played an important role in lowering the pest population. In Skradin, entomopathogenic fungus Beauveria bassiana that occurred on the overwintering larvae broke the pest population, and in Dugi otok it was recorded, but to a much lesser extent and in combination with Drino inconspicua parasitoid. In both cases pines recovered very well in the following spring, with some bark beetle attacks mostly at the edge of the forest. Conclusions: The outbreaks of D. pini resulting with a total defoliation of Aleppo pine stands, and the fact that they occurred in the Mediterranean region which is not an optimal area for its appearance, makes these events unusual. Also, this is the first record of D. pini population breakdown by some antagonist.
机译：背景与目的：松树手提飞蛾Dendrolimus pini在欧洲是一种分布广泛的害虫，可导致严重的针叶脱落，并在较大的地理区域爆发。在克罗地亚，仅在大陆部分发现了松果线虫的存在，但丰度不高，到目前为止，从未记录到人口暴发。材料和方法：2014年秋天，阿贝颇松（Pinus halepensis Mill。）发生了意想不到的完全脱叶，发生在伊贝尼克附近的Skradin附近，随后于2017年夏季和秋季在Tela ?? ica自然公园脱叶， Dugi otok。检查了受感染的区域，并对土壤表面的越冬幼虫进行了计数，以估计种群数量并评估是否超过了种群的临界数量。样本被收集并转移到克罗地亚森林研究所的昆虫学分析实验室进行进一步的实验室分析。结果：由于每平方米土壤表面发现了超过10个幼虫，因此可以得出结论，两个地方均发生了暴发。在这两种情况下，天然拮抗剂在降低害虫数量方面都起着重要作用。在Skradin，越冬幼虫上发生的致病性真菌球孢白僵菌破坏了害虫种群，在Dugi otok中记录下来，但程度要小得多，并与Drino inconspicua parasitoidoid结合。在这两种情况下，松树在次年的春季都恢复得很好，一些树皮甲虫的袭击主要发生在森林边缘。结论：由于阿勒颇松林完全脱叶而导致的D. pini暴发，以及它们发生在地中海地区，而不是其出现的最佳区域，这一事实使这些事件不寻常。同样，这是一些敌对昆虫对D. pini种群造成破坏的第一个记录。

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