Functional Response and Predation Preference of Orius tantillus to Megalurothrips usitatus

doi:10.16409/j.cnki.2095-039x.2022.03.021

Abstract

Abstract: Orius tantillus (Motschulsky) is one of the local nature enemies of thrips in Hainan province, but its predatory capacity on Megalurothrips usitatus has never been determined. In this work, the functional response, searching efficiency, predation preference and interference response of O. tantillus on M. usitatus were studied under laboratory conditions. The results showed that the predation of O. sauteri on M. usitatus followed the Holling II functional response. The predation amount of the 1^st-5^th instar nymphs and adults of O. tantillus on the 2^nd instar nymphs of M. usitatus were all positively correlated with the prey density, while their searching efficiency were negatively correlated with the prey density. The predation ability of the nymphs increased with increasing instar stage, reaching the highest at the 5^th instar nymphs with a a'/T_h value of 42.9 thrips. The predation of the 5^th instar nymphs was strongly affected by intraspecific interference, and the average daily predation amount decreased with the increase of the predator density. The interference model was E＝0.412P^-0.822, the apportionment competition model was I＝1.042lgP＋0.071. The predation preference results showed that both the 5^th instar nymphs and adults of O. tantillus strongly preferred the 2^nd instar prey nymphs. These results suggest that O. tantillus is of strong control potential against the 2^nd instar nymphs of M. usitatus.

Key words: Orius tantillus, Megalurothrips usitatus, predation, searching efficiency, predation preference

CLC Number:

S476.2

QIU Haiyan, FU Buli, HE Shilan, LIU Kui. Functional Response and Predation Preference of Orius tantillus to Megalurothrips usitatus[J]. Chinese Journal of Biological Control, 2022, 38(6): 1443-1448.

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