Predation Function on Different Stages of Therioaphis trifolii (Monell) by the Orius strigicollis

doi:10.16409/j.cnki.2095-039x.2026.01.006

Abstract

Abstract: The predatory role and biological control potential of the Orius strigicollis on Therioaphis trifolii (Monell) were investigated by recording the predatory duration and capacity of adult O. strigicollis on T. trifolii at different age stages in laboratory, and the Holling II and Hassell-Varley models were fitted to calculate the time of feeding, the response of predation function, the searching effect and the mutual interference of adult O. strigicollis on T. trifolii. The results showed that the adult O. strigicollis had the shortest predatory duration(7.33 min) on the 1^st instar nymph of T. trifolii, and that the predatory capacity, i.e., the ratio of the instantaneous attack rate to the time of handling a single prey, was 44.9, with the theoretical daily maximum predatory capacity of 50. O. strigicollis had the longest predatory duration (38.67 min) on the adult T. trifolii and the predatory capacity was 13.93, with the theoretical daily maximum predatory capacity of 18.18. The daily predatory capacity of adult O. strigicollis was positively correlated with the density of the prey and negatively correlated with the searching effect. The predatory rate and the intensity of scrambling competition decreased with the increase of its own density. In conclusion, O. strigicollis has a high potential for biological control of T. trifolii, especially for the 1^st instar nymph.

Key words: Orius similis, Therioaphis trifolii, preation function, interference response

CLC Number:

S476.2

FU Zuying, LUO Yingning, MIAO Miao, WANG Ying, LIU Chang, ZHANG Rong, BAN Liping, TAN Yao, WEI Shuhua. Predation Function on Different Stages of Therioaphis trifolii (Monell) by the Orius strigicollis[J]. Chinese Journal of Biological Control, 2026, 42(2): 496-502.

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