Control Effects of Orius sauteri on Frankliniella occidentalis in Pepper and Eggplant Flowers in Greenhouses

doi:10.16409/j.cnki.2095-039x.2022.03.018

Abstract

Abstract: The beneficial/pest ratio is an important parameter in the application of biological control agents in fields. The control effect and the best predator/pest ratio of Orius sauteri (Poppius) (Hemiptera: Anthocoridae) against Frankliniella occidentalis (Pergande) (Thysanoptera: Thripidae) in the flowers of solanaceous crops were investigated through recording the colony dynamics of F. occidentalis after releasing O. sauteri under 5 different predator/pest ratios in commercial greenhouses of pepper and eggplant. The control of F. occidentalis in the flowers of pepper and eggplants was compared at greenhouse conditions between releasing O. sauteri and applying bio-pesticides. Results showed that the density of the 2^nd instar nymphs of F. occidentalis in pepper and eggplant flowers significantly decreased at 48 h after the release of the 5^th instar nymphs of O. sauteri, compared with the control without releasing predators. When the predator/pest ratio was 5:30, i.e., five predators were released when there were thirty thrips, the densities of F. occidentalis in pepper and eggplant flowers were the lowest, 0.67 and 1.17 thrips per flower, respectively, and the control efficiencies were 97.67% and 95.93%, respectively. In addition, when the predator/pest ratio was between 1: 30 and 5: 30, there was a positive correlation between the ratio and the control effect in greenhouse. In the long term, compared with the spraying of bio-pesticides, O. sauteri had a better, lasting control effect on thrips in the flowers of pepper and eggplant under commercial greenhouses. The research indicates that O. sauteri has the potential to effectively control F. occidentalis in pepper and eggplant greenhouse and has determined the optimal predator/pest ratio for releasing O. sauteri. The results are helpful for controlling thrips in crop flowers and the large-scale field application of O. sauteri in greenhouse.

Key words: predator, benefit/pest ratio, biological control, integrated pest management, field application

CLC Number:

S476.2

WANG Jie, ZHANG Chen, ZHU Zhengyang, LIU Junxiu, WANG Su, XU Qingxuan, DI Ning. Control Effects of Orius sauteri on Frankliniella occidentalis in Pepper and Eggplant Flowers in Greenhouses[J]. Chinese Journal of Biological Control, 2023, 39(2): 264-270.

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