| Project/Area Number |
15580038
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Applied entomology
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| Research Institution | Chiba University |
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Principal Investigator |
NOMURA Masashi Chiba University, Faculty of horticulture, Associate Professor, 園芸学部, 助手 (50228368)
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| Project Period (FY) |
2003 – 2004
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| Project Status |
Completed (Fiscal Year 2004)
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| Budget Amount *help |
¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 2004: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2003: ¥1,900,000 (Direct Cost: ¥1,900,000)
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| Keywords | Trichoplusia ni / Autographa nigrisigna / cabbage field / cold resistance of larva / change of dominant species / Copidosoma floridamum / parasite rate / 優占種交代 / 寄生蜂 / アンケート調査 / 圃場調査 / 農薬感受性試験 / ミトコンドリアDNA / 塩基配列 |
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| Research Abstract |
The cabbage looper Trichoplusia ni (Lepidoptera, Noctuidae) is notorious crop pest in the USA for long time. However, there was no report about T.ni as a crop pest in Japan.
But there were many larvae of T.ni in cabbage field of west parts of Japan (Kagoshima and Hyogo prefectures) in 2000.
Distribution of Japanese cabbage looper is spreading from south-western to north-eastern parts of Japan. For example, there was no larvae in Chiba prefecture, and first appearance of T.ni was confirmed by this project in 2003.
Annual occurrence of T.ni in cabbage field was monitored by adults captured by pheromone trap and larvae by field collecting. The number of larvae of T.ni is increasing from spring to fall. The dominant species of cabbage fields in Hyogo prefecture is Autographa nigrisigna in spring, then changing to Trichoplusia ni in fall. But cold resistance of larva of A.nigrisigna is stronger than T.ni. So, the dominant species of cabbage field changing to A.nigrisigna in spring again.
Origin of Japanese T.ni could not clarify in this project. But parasitism rate of Copidosoma floridamum on Japanese T.ni is lower than T.ni of the USA. These data suggested that Japanese cabbage looper is quite different from American strain.
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