不同温度条件下叉角厉蝽对亚洲玉米螟的捕食效能分析OA

[Objective]The present study aimed to analyze the predatory efficiency of Eocanthecona furcellata on Os-trinia furnacalis under different temperature conditions,so as to provide theoretical reference for the precise field release and indoor large-scale rearing of Eocanthecona furcellata.[Method]The functional responses of the 4th instar nymphs,5th instar nymphs,and adults of Eocanthecona furcellata preying on the 4th instar larvae of Ostrinia furnacalis were deter-mined indoors under different temperature treatments(15,20,25,30,and 35℃)and different prey densities(3,6,9,12,and 15 insect/box).The Holling type Ⅱ disc equation was adopted to fit the predation parameters,and the search efficiency was calculated.[Result]The predatory functional responses of the 4th instar nymphs,5th instar nymphs,and adults of Eocanthecona furcellata to the 4th instar larvae of Ostrinia furnacalis all conformed to the Holling type Ⅱ.The theoretical maximum daily prey consumption of the 5th instar nymphs of Eocanthecona furcellata reached 52.08 insects at 30℃,while the values for the 4th instar nymphs and adults peaked at 35℃,recorded as 47.84 and 43.55 insects respec-tively.At identical prey densities,the theoretical prey consumption and search efficiency of Eocanthecona furcellata on the 4th instar larvae of Ostrinia furnacalis across all developmental stages increased and then decreased with rising tem-perature,peaking at 30℃.Both indexes decreased slightly at 35℃but remained higher than those at 25℃.The instanta-neous attack rates of the 4th instar nymphs,5th instar nymphs,and adults of Eocanthecona furcellata exhibited an overall trend of first increasing and then decreasing with temperature elevation,all attaining maximum values at 30℃(0.8892,0.9694,and 0.8834 respectively).Handling time generally shortened as temperature increased.The shortest handling times of the 4th instar nymphs and adults were detected at 35℃(0.0209 and 0.0176 d respectively),whereas the mini-mum handling time of the 5th instar nymphs occurred at 30℃(0.0192 d).[Conclusion]Temperature greatly affects the predatory efficiency of Eocanthecona furcellata on Ostrinia furnacalis.Higher temperatures(30-35℃)facilitate the predatory performance of Eocanthecona furcellata,indicating that Eocanthecona furcellata possesses considerable bio-logical control potential against the 4th instar larvae of Ostrinia furnacalis.