Population Dynamics and Community Characteristics of Main Arthropods on the Third-cut Alfalfa in the Yellow River Delta
In 2022,a systematic survey was conducted on the main arthropod species and quantities in the third-cut alfalfa fields of the Shandong Province Yellow River Delta Agricultural High-tech Industry Demonstration Zone,analyzing the population dynamics of main pests and their natural enemies and the characteristics of the arthropod communities.The main arthropods on the third-cut alfalfa included 2 classes,11 orders,31 families and 50 species,among these,there are 29 species of pests,with thrips and whiteflies being the most abundant;there are 21 species of natural enemies,with hoverflies and the parasitic wasp,Aphidius gifuensis,being the most abundant.Dominant pest species included Frankliniella intonsa,F.occidentalis,lepidopteran larvae,Apolygus lucorum,Edwardsiana flavescens and Bemisia tabaci;the main natural enemy dominant species were the Aphidius gifuensis,Cotesia ruficrus,Orius minutus,Ebrechtella tricuspidata and Coleosoma octomaculatum.The community characteristic indices of the main arthropod communities on alfalfa were analyzed,indicating that the growth period of alfalfa,climatic conditions,and the arthropods on surrounding plants were the main factors affecting the population dynamics and community structure characteristics.The optimal segmentation method was used to divide the temporal pattern of the main arthropod community on the third-cut alfalfa into three periods:August 14th to September 18th,September 19th to September 30th,and October 1st to October 31st.Combining the growth period of alfalfa and environmental conditions,we analyzed the occurrence characteristics of the main arthropods on the third-cut alfalfa during these three periods.The research results provide a scientific theoretical basis for the control of pests and the protection and utilization of natural enemies on the third-cut alfalfa.
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