Author
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Takahashi K
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著者
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高橋敬一
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Title
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Overwintering and aestivation sites of Coccinella septempunctata
brucki Mulsant (Coleoptera: Coccinellidae) and its migration to alfalfa
fields
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タイトル
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ナナホシテントウの越冬・越夏およびアルファルファ草地への移動
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Keywords
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Coccinella septempunctata brucki Mulsant, overwintering, aestivation,
migration, alfalfa
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Abstract
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Overwintering Coccinella septempunctata brucki adults were found in
mounds and bunches of Japanese pampas grass in central Japan in February.
Most adults were found in the south- and east-facing mounds, where the air
temperature was 2-degrees-C-6-degrees-C higher and there were more aphids
than in the north-facing mound. Adult beetles started to migrate to an
alfalfa field infested with aphids in early spring, when daily maximum
temperatures exceeded 12-degrees-C, but only few adults migrated to a
field where the aphids had been eliminated. Some of the adults marked in
their overwintering sites were recaptured in the alfalfa fields. In
August, aestivating adults were found mainly in the bunches of Japanese
pampas grass and some of the adults marked in August were recaptured in
the alfalfa fields in the next spring.
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要旨
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Journal
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Appl.Ent.Zool., 28(4), 1993, p.473-478.
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