Population Dynamics and Temporal Niches of Major Pests and Their Natural Enemies in Okra Fields

doi:10.16409/j.cnki.2095-039x.2022.05.004

Abstract

Abstract: In this study, the species and population dynamics of pests and natural enemies in okra fields and the ecological relationship between the main pests and natural enemies were investigated to provide scientific basis for biological control of pests in okra fields. The species and quantities of pests and natural enemies in okra fields were recorded by visual observation and five-point sampling method, and the niche of the main pests and natural enemies was analyzed. The results showed that 21 insect species belonging to 13 families and 6 orders were found in okra fields. The dominant pest species were Aphis gossypii Glover and Sylepta derogata, both presenting aggregate distribution in the fields. The dominant natural enemy species were Propylea japonica,Harmonia axyridis Pallas, Ebrechtella tricuspidata, Hylyphantes graminicola, Apanteles derogatae and Sympiesis sp.. Among them, aphids occupied the smallest niche breadth, occurring intensively in June in the fields. Sylepta derogata occupied the largest niche breadth and a long occurrence period in the fields from July to September. The temporal niche overlap between aphids and ladybirds was 0.8593. Ladybirds were the dominant natural enemies of aphids, displaying a close population coupling with aphids. The temporal niche overlaps between S. derogata and its dominant natural enemies spiders, A. derogatae and S. sp. were 0.7220, 0.7175 and 0.6797, respectively. The three natural enemies of S. derogate showed obvious following effect and synergistic control effect on S. derogate. These results indicate that the natural enemies populations in the okra fields synchronize with those of the pests in the temporal niche, and thus should be protected and utilized to enhance their roles of natural control of pests.

Key words: Abelmoschus esculentus, pests, natural enemies, population dynamics, ecological niche

CLC Number:

S476.1

CONG Shengbo, XU Dong, YANG Nina, WANG Ling, WANG Jintao, LIU Weiguo, YANG Tiantian, WAN Peng. Population Dynamics and Temporal Niches of Major Pests and Their Natural Enemies in Okra Fields[J]. Chinese Journal of Biological Control, 2022, 38(3): 753-759.

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