JZUS - Journal of Zhejiang University SCIENCE

Journal of Zhejiang University SCIENCE B 2008 Vol.9 No.7 P.572-577

http://doi.org/10.1631/jzus.B0820009

Do rice water weevils and rice stem borers compete when sharing a host plant?

Author(s): Sheng-wei SHI, Yan HE, Xiang-hua JI, Ming-xing JIANG, Jia-an CHENG
Affiliation(s): Institute of Insect Sciences, Zhejiang University, Hangzhou 310029, China
Corresponding email(s): mxjiang@zju.edu.cn
Key Words: Chilo suppressalis, Interspecific interaction, Lissorhoptrus oryzophilus, Sesamia inferens, Stem borer, Weevil

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Abstract: The rice water weevil (RWW) Lissorhoptrus oryzophilus Kuschel (Coleoptera: Curculionidae) is an invasive insect pest of rice Oryza sativa L. in China. Little is known about the interactions of this weevil with indigenous herbivores. In the present study, adult feeding and population density of the weevil, injury level of striped stem borer Chilo suppressalis (Walker) (Lepidoptera: Pyralidae) and pink stem borer Sesamia inferens (Walker) (Lepidoptera: Noctuidae) to rice, as well as growth status of their host plants were surveyed in a rice field located in Southeastern Zhejiang, China, in 2004 with the objective to discover interspecific interactions on the rice. At tillering stage, both adult feeding of the weevil and injury of the stem borers tended to occur on larger tillers (bearing 5 leaves) compared with small tillers (bearing 2~4 leaves), but the insects showed no evident competition with each other. At booting stage, the stem borers caused more withering/dead hearts and the weevil reached a higher density on the plants which had more productive tillers and larger root system; the number of weevils per tiller correlated negatively with the percentage of withering/dead hearts of plants in a hill. These observations indicate that interspecific interactions exist between the rice water weevil and the rice stem borers with negative relations occurring at booting or earlier developmental stages of rice.

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