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Chinese Journal of Biological Control ›› 2022, Vol. 38 ›› Issue (4): 959-966.DOI: 10.16409/j.cnki.2095-039x.2021.09.017

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Predatory Function of Harmonia axyridis and Propylea japonica Larvae to Young Larvae of Tuta absoluta

YANG Guiqun, FAN Wei, ZHANG Qian, LI Mao, JIANG Zhengxiong, DUAN Pan, HU Changxiong, CHEN Guohua, ZHANG Xiaoming   

  1. State Key Laboratory for Conservation and Utilization of Biological Resources in Yunnan/College of Plant Protection, Yunnan Agricultural University, Kunming 650201, China
  • Received:2021-07-08 Published:2022-08-11

Abstract: The control ability of Harmonia axyridis and Propylea japonica on Tuta absoluta was evaluated by investigating the predatory function and searching responses of the 4th instar larvae H.axyridis and P.japonica to the young larvae of T.absoluta (1stand 2nd instars) under laboratory conditions.The results showed that the predatory functional responses of the 4th instar larvae H.axyridis and P.japonica to the 1st and 2nd instar larvae of T.absoluta conformed to HollingⅡ model;the daily predation of the two ladybirds species was positively correlated with the prey density within a certain range,when the T.absoluta density was N→+∞,the maximum daily predation Namaxof H.axyridis and P.axyridis to the 1st instar T.absoluta larvae were 147.06 and 333.33,respectively,and to the 2nd instar T.absoluta larvae,140.85 and 149.25,respectively.The highest daily predation rate of H.axyridis reached 98%,significantly higher than that of P.axyridis.The searching efficiency of the two ladybirds species on T.absoluta decreased with the increase of prey density,which was higher in H.axyridis than in P.axyridis.The highest searching efficiency of H.axyridis was >0.90,while that of P.axyridis was<0.80.The predatory ability of H.axyridis to low instar larvae of T.absoluta was slightly stronger than that of P.axyridis,but both the ladybirds species afforded high predation and control of young larvae of T.absoluta.The two ladybirds species can be further studied as important biological control agents for control of T.absoluta.

Key words: Harmonia axyridis, Propylea japonica, Tuta absoluta, predation function

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