The relationship between developmental stages of rice spikelets and the incidence of the rice bugs Leptocorisa chinensis, Lagynotomus elongatus, and Stenotus rubrovittatus in rice fields
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概要
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To clarify the relationship between the occurrence patterns of three species of rice bugs and the developmental stage of panicles in rice fields, we carried out two experiments. In the first experiment, we observed the development of spikelets in three paddy fields (Plots A, B, and C). The rice variety 'Sainohana' was used in Plot A and 'Koshihikari' was used in Plots B and C. Dates of transplanting were on April 25, May 8, and June 19; for Plots A, B, and C, respectively. Spikelets were classified into three stages based on ovarian development: Stage I (initial), Stage II (middle), and Stage III (fullness). After the initial heading stage, changes in the average number of each stage of spikelet development were expressed in days or cumulative degree-days above a base of 10℃. In the second experiment, the incidence of each rice bug species was monitored in rice fields. Then, the relationship between rice bug incidence and cumulative degree-days was determined. Variations in the average number of spikelet development stages among the three plots expressed in cumulative degree-days were smaller than those expressed in days after the initial heading stage. The peaks of incidence of adult rice bugs were near the peak of Stage I at 50-150 degree-days. The incidence of nymphs began to increase near the peak of Stage II at 200-250 degree-days. The occurrence patterns of the rice bugs were found to be closely related to the abundance of the three stages of spikelets. Cumulative degree-days can be used to uniformly express the changes in the incidence of rice bugs among different rice varieties, seasons, and fields.
- 日本応用動物昆虫学会の論文
- 2005-05-25
著者
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Wada Takashi
金沢大学 医学部血液浄化療法部
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Watanabe Tomonari
National Agricultural Research Center
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Wada Takashi
Kanazawa Univ. Graduate School Of Medical Sci. Kanazawa Jpn
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SUZUKI Yoshito
National Agricultural Research Center
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Suzuki Yoshito
National Agricultural Res. Center Tsukuba Jpn
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Suzuki Y
Kyushu National Agricultural Experiment Station
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Suzuki Yoshito
Kyushu National Agricultural Experiment Station
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Watanabe Tomonari
National Agricultural Res. Center
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Watanabe Tomonari
National Agricultural Research Center National Agriculture And Food Research Organization
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Watanabe Tomonari
Computational Modeling Laboratory National Agriculture Research Center
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Watanabe Tomonari
National Agricultural Research Center (narc)
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ISHIZAKI Mami
National Agricultural Research Center
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TAKEUCHI Hiroaki
National Agricultural Research Center, National Agriculture and Food Research Organization
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OKU Shintaro
National Agricultural Research Center
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Wada T
Division Of Blood Purification Department Of Gastroenterology And Nephrology Graduate School Of Medi
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Ishizaki Mami
National Agricultural Research Center National Agriculture And Food Research Organization
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Wada T
Department Of Laboratory Medicine Graduate School Of Medical Science Kanazawa University
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Takeuchi Hiroaki
National Agricultural Research Center National Agriculture And Food Research Organization:(present O
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Suzuki Y
National Agricultural Research Center
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Suzuki Yoshito
National Agricultural Res. Center
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Takeuchi Hiroaki
National Agricultural Research Center for Kyushu Okinawa Region
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