Field Predation Effects of Chrysopa pallens Koch and Predatory Mites on Two-spotted Spider Mite in Strawberry

doi:10.16409/j.cnki.2095-039x.2026.09.014

Abstract

Abstract: Natural enemies are important in modern ecological control strategies. To compare the control effects of Chrysoperla pallens and predatory mites on Tetranychus urticae in greenhouse cultivation and clarify the differences in their efficiency, this study investigated the population dynamics of T. urticae under the influence of C. pallens and predatory mites in the field. The control effects of different release densities of C. pallens eggs, first instar larvae, and second instar larvae on T. urticae were evaluated. Additionally, the field predation effects of different release densities of predatory mites (Phytoseiulus persimilis Athias-Henriot, Amblyseius cucumeris Oudemans, Neoseiulus californicus McGregor, and N. barkeri Hughes) were compared. The results showed that the number of T. urticae decreased in all treatment groups with the release of 5, 10, or 15 C. pallens eggs/plant. In the three treatments with the release of 5, 10, or 15 the first instar larvae of C. pallens per plant, the number of T. urticae showed a non-positive correlation with the time post release. In the three treatments of releasing 1, 2, or 3 the 2^nd instar larvae of C. pallens per plant, the number of T. urticae remained at a stable level with the time post release. The release of different species and densities of predatory mites had varying degrees of control of T. urticae. The number of T. urticae decreased in all treatment groups at 4 days post release, and a certain control was achieved on the 16^th day post release. Among all treatments, the 1st instar larvae of C. pallens had the best control of T. urticae. The control was the lowest on the 16^th day post release of one the 2^nd instar C. pallens larva per plant, significantly lower than the control achieved by release of the 2^nd instar larvae of C. pallens at 15 and 20 larvae/plant, eggs of C. pallens at 15 eggs/plant, and P. persimilis at 20 and 60 adults/plant. This study provides a scientific basis for the optimal application of C. pallens and predatory mites in field biological control of T. urticae.

Key words: Chrysopa pallens, predatory mites, Tetranychus urticae, Fragaria×ananassa(Weston) Duchesne ex Rozier, control effects

CLC Number:

S476.2

JIANG Liben, XU Qiujing, CAO Rongxiang, LOU Tiancheng, GUO Chengbao, TIAN Houjun. Field Predation Effects of Chrysopa pallens Koch and Predatory Mites on Two-spotted Spider Mite in Strawberry[J]. Chinese Journal of Biological Control, 2026, 42(5): 1300-1308.

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