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Impact of Pesticide Treatment on an Arthropod Community in the Korean Rice Ecosystem

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Author(s): Park, Hong-Hyun | Joon-Ho Lee

Journal: Journal of Ecology and Field Biology
ISSN 1975-020X

Volume: 32;
Issue: 1;
Start page: 19;
Date: 2009;
Original page

Keywords: Arthropod guilds | Insecticide application | Rice ecosystems | Trophic interactions

ABSTRACT
An arthropod community in a rice ecosystem was surveyed to determine the impact of twoinsecticides frequently used in Korean rice ecosystems: carbofuran 3GR, which targets the rice water weevil,Lissorhoptrus oryzophilus Kuschel (Coleoptera: Curculionidae) in the early season and fenobucarb EC, whichtargets the brown planthopper, Nilaparvata lugens (Stål) (Hemiptera: Delphacidae) in the mid- and lateseasons, respectively. Overall, the application of the insecticides reduced density of total arthropods by 48.4%compared to the untreated field, but their impact on each functional group were different. Carbofuran GRtreatment on 1 June reduced the L. oryzophilus population significantly until mid-season. The population of filterfeedingchironomids was also reduced by 50%, whereas the spider population was less disturbed. FenobucarbEC treatment on 16 August significantly reduced N. lugens and detrivorous entomobryid populationsuntil the late season. Both web-building and wandering spiders were also significantly disturbed by fenobucarbEC although the impact differed according to their behavioral differences. While the population of web-buildingspiders significantly decreased over time, that of wandering spiders recovered from the disturbance a fewweeks later.
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