Issue:ISSN 2095-1353
CN 11-6020/Q
Director:Chinese Academy of Sciences
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2012年49 No.6
Effect of retaining grass on rice field ridges on rice planthoppersand the diversity of natural enemies of rice pests in rice fields
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Key Words： rice field，rice planthopper，predatory natural enemy，diversity，grasses
Abstract：To determine the effect of retaining grass on rice ridges on rice planthoppers and the diversity of their predatorynatural enemies in rice fields，we compared rice fields with grass to those without grasses． The results indicate that theJune to October abundance of rice planthoppers per 100 rice plants in rice fields with grass was 891. 11 ± 133. 12，35. 31% less than in fields without grass． There were 35 species of predatory natural enemies belonging to 23 families and5 orders in rice fields with grass compared to 33 species of predatory natural enemies belonging to 21 families and 5 ordersin rice fields without grass． The dominant species of predatory natural enemies in fields without grass were Ummeliatainsecticeps Boes． et Str． ，Pirata subpiraticus Boes． et Str． and Cyrtorrhinus livdipennis Reuter，whereas in fields with grass
the dominant species were U． insecticeps， Erigonidium graminicolum ( Sundevall )， P． Subpiraticus and Lycosapseudoamulata ( Bose． et Str． ) ． The number per 100 rice plants，richness and diversity index of predatory naturalenemies in fields with grass were 128. 89 ± 13. 52，33. 67 ± 0. 50 and 4. 53 ± 0. 04 respectively，which were respectively31. 96% ，25. 73% and 5. 59% that found in fields without grass． We conclude that maintaining grass on rice field ridgesis a potential way to maintain populations of beneficial insects and control rice pests in China．