Important natural enemies of Ricania speculum and the spatial relationship between these predators and this pest
Author of the article:CHENG Xian1** ZHANG Shu-Ping1 YU Yan1 BI Shou-Dong1*** WANG Zhen-Xing1 LI Shang2 WANG Jian-Pan
Author's Workplace:1. School of Science, Anhui Agricultural University, Hefei 230036, China; 2. School of Forestry and Landscape Architecture, Anhui Agricultural University, Hefei 230036, China
Key Words: Ricania speculum; natural enemies; relationship in space; geostatistics; grey correlation degree
Abstract:
[Objectives] To identify the dominant natural enemies of Ricania speculum and to provide a
scientific basis for the comprehensive protection and utilization of such
species for the control of this pest. [Methods] Geo-statistics and grey correlation
were used to analyze the spatial relationships between R. speculum and its natural enemies in two tea plantations in 2015
and 2016. [Results] The
four natural enemies whose spatial distributions were most closely correlated
with that of R. speculum in the
Wuniuzao tea plantation were Tetragnatha
squamata Karsch, Tetragnatha
maxillosa, Neoscona theisi and Theridion octomaculatum. The four
natural enemies whose spatial distributions were most closely correlated with
that of R. speculum in the Baihaozao
tea plantation were Clubiona japonicola Boes. et Str, Theridion octomaculatum, Neoscona theisi and Hylyphantes graminicola. The four
natural enemies whose spatial distributions were most closely correlated with
that of R. speculum were the same in
two tea varieties; in 2015, these were T. maxillosa and C. japonicola and in 2016, they were Hylyphantes
graminicola and T. octomaculatum. [Conclusion] Comprehensive
analysis, including close index summation and serial number summation, indicate
that the three natural enemies whose spatial distributions were most closely
correlated with that of R. speculum in both tea plantations in both years, were T.
octomaculatum, C. japonicola and N. theisi. These results promote the rational use and protection of
natural enemies of R. speculum.