摘要
为了解益蝽对黄野螟的田间防治潜力,在沉香树林间黄野螟幼虫发生期释放益蝽的3龄若虫和成虫,观察其捕食黄野螟幼虫的行为和防控情况。结果表明:益蝽3龄若虫和成虫都能捕食2龄~5龄黄野螟幼虫,1头益蝽每天平均可捕食1头幼虫;若虫和成虫都有吸食沉香树嫩茎叶汁液行为,在沉香树枝杈和叶片上攀爬较随机,无明显搜寻幼虫的表现;黄野螟老熟幼虫吐丝和吊丝下垂逃逸能力远大于低龄和高龄幼虫,使得益蝽捕食老熟幼虫的耗时和难度远大于低龄和高龄幼虫;观察期间,供试沉香树失叶率逐日增加,益蝽不能快速有效地降低黄野螟幼虫的发生数量。加之益蝽吸食茎叶汁液,建议在黄野螟初孵幼虫发生期适量投放。
In order to understand the potential of Picromerus lewisi in controlling Heortia vitessoides in the field,the 3rd instar nymphs and adults of P.lewisi were released in the Aquilaria sinensis forests during the larva period of H.vitessoides,and the predatory behavior and control of P.lewisi on H.vitessoides larvae were observed.The results showed that both the 3rd instar nymphs and adults of P.lewisi can predate the 2nd to 5th instar H.vitessoides larvae,with an average predation number of one larva per P.lewisi per day.Both nymphs and adults fed on the sap of tender stems and leaves of A.sinensis trees,and they climbed rather randomly on the branches and leaves,showing no obvious searching behavior for H.vitessoides larvae.The mature H.vitessoides larvae had a much greater ability than the younger and older larvae to emit and hang their silk for escape,making it much more time-consuming and difficult for P.lewisi to predate the mature larvae.During the observation days,the defoliation rate of the tested A.sinensis trees daily increased,indicating that P.lewisi was unable to quickly and effectively reduce the number of H.vitessoides larvae.In addition,as well as P.lewisi fed on the sap of stems and leaves,it is only recommended to release P.lewisi in an appropriate amount during the early-hatching period of the H.vitessoides larvae.
作者
陈龙舟
林荣远
郭云
冼子耀
古天一
王祥
Chen Longzhou;Lin Rongyuan;Guo Yun;Xian Ziyao;Gu Tianyi;Wang Xiang(Forestry Institute of Maoming City,Maoming Guangdong 525000;Chunlong Qinan Agarwood Planting Professional Cooperative,Dianbai Guangdong 525400)
出处
《热带林业》
2024年第3期102-104,109,共4页
Tropical Forestry
基金
绿美广东六大提升行动专项资金(基层林业科技支撑服务)项目(2024MMKJ01002)“沉香树害虫黄野螟绿色防治技术示范推广”。
关键词
益蝽
沉香树
黄野螟
绿色防治
Picromerus lewisi
Aquilaria sinensis
Heortia vitessoides
Green prevention and control
