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RISS 인기검색어
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- 저자 : Kong Luen Heong (검색결과 2 건)
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Lu, Zhong-Xian,Heong, Kong-Luen,Yu, Xiao-Ping,Cui Hu Korean Society of Applied Entomology 2004 Journal of Asia-Pacific Entomology Vol.7 No.1
Ecological fitness characters of the brown planthopper increased proportionally with increase in nitrogen content of rice plants they were bred on. The nymphs survived better and had shorter life spans. Females weighed heavier, laid more eggs and lived longer. In addition, egg hatchability was significantly increased. Number of insects and dry mass from one pair of parents were also significantly higher in high nitrogen plants. Relationships between each of these characters with nitrogen content fitted the linear models well. These characters from insects reared on four successive generations in low, medium and high nitrogen regimes were also investigated. There was little between-generation difference in most characters, except for the population and its dry mass produced by one pairs of insects. This implies that in areas where nitrogen-rich crops are abundant over long periods, ecological fitness of the brown planthoppers are potentially higher and if natural biological control is compromised, the risk of extensive outbreaks are higher. Implications to sudden stoppage of insecticide use in these areas are also discussed.
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Yang Hu,Jia-An CHENG,Zengrong Zhu,Kong Luen Heong,Qiang Fu,Jiachun He 한국응용곤충학회 2014 Journal of Asia-Pacific Entomology Vol.17 No.4
The White-backed Planthopper (WBPH), Sogatella furcifera (Horváth (Hemiptera: Delphacidae)) has been the most serious pest threatening rice production in Asia since the late 1970s. A series of field experiments using the same research protocol was carried out to compare the effects of main environmental factors on population development of WBPH in tropical (Philippines) and subtropical (China) areas in 2010–2012 and to provide further evidences of ecological mechanisms involved that cause frequent outbreak in subtropical rice. Outcomes showed that WBPH population in subtropical area could be characterized as the higher population growth rates and higher peak densities. The average growth rate (116.60 ± 46.16) in subtropical area was significantly higher than that in tropical area (24.02± 11.25). The higher realized fecundity in subtropical area indicated that the higher growth rates and higher peak densities were mainly related to the poor natural regulating forces in subtropical area. Our results showed that resistant variety could significantly reduce the peak density in subtropical areas, but not in tropical areas. We inferred that the reason for not detecting the effect of resistant variety in tropical area was due to the dominant controlling effects provided by natural enemies,which means that the natural regulating effect in tropical areawas strong enough to disguise the effects of resistant variety. The significant interactions between plant resistance and location demonstrated that integration of natural enemies and use of plant resistance could play important roles for reducing outbreak frequency of WBPH effectively in subtropical rice.
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