The spruce bark beetle, Ips typographus (L.), attack progression (adult and larval galleries) and parental and offspring mortality rate were assessed in managed forests of the Poiana Ruscă and Bihor Mountains, along with Western Romanian Carpathiansusing fungal (Beauveria bassiana) treatments. The results show that the effect of B. bassiana on adult (maternal) gallery length was similar to the untreated variant and was less effective than the synthetic insecticide lambda-cyhalothrin applied at a dose of 50 g/L. Additionally, its effect on the mean larval gallery number per maternal gallery was low. B. bassiana did not have a significant influence on the attack progression. Significant correlations between log diameter and I. typographus attack progression were detected; such differences were higher than the effect of any treatment. Altogether, abiotic (low humidity, high temperature) and biotic factors (log diameter) influenced the bark beetles’ attack progression and reduced the entomopathogenic fungal effects. Considering the efficacy of the B. bassiana treatment on logs infested with I. typographus, the results showed that parents and offspring were infected, but even if the fungal treatment was applied in high concentrations, the mortality rate remained relatively low. Further research is necessary to test if different B. bassiana strains and their commercially recommended concentrations might be more effective under dry and warm climate conditions, respectively.

中文翻译：

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田间条件下昆虫病原真菌白僵菌 (Cordycipitaceae) 对树皮甲虫 Ips typographus (L.) 的影响

在 Poiana Ruscă 和 Bihor 山脉的管理森林以及使用真菌 ( Beauveria bassiana ) 处理的西罗马尼亚喀尔巴阡山脉中评估了云杉树皮甲虫、Ips Typgraphus (L.)、攻击进展（成虫和幼虫画廊）以及亲代和后代死亡率. 结果表明，B. bassiana对成年（母体）廊道长度的影响与未处理的变体相似，并且不如以 50 g/L 的剂量施用的合成杀虫剂 λ-三氯氟氰菊酯有效。此外，它对每个母体画廊的平均幼虫画廊数量的影响很低。B. bassiana对攻击进展没有显着影响。对数直径和之间的显着相关性I.检测到印刷字体攻击进展；这种差异高于任何治疗的效果。总之，非生物（低湿度、高温）和生物因素（对数直径）影响了树皮甲虫的攻击进程并降低了昆虫病原真菌的影响。考虑到B. bassiana处理对感染了I. typographus的原木的疗效，结果表明父母和后代都被感染，但即使在高浓度下应用真菌处理，死亡率仍然相对较低。需要进一步的研究来测试不同的B. bassiana菌株及其商业推荐浓度可能分别在干燥和温暖的气候条件下更有效。