Hay imported into Japan in 1995 contained exotic weed seeds
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- Asai Motoaki
- National Agricultural Research Center
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- Kurokawa Shunji
- National Agricultural Research Center
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- Shimizu Norihiro
- Kouzu Dairy Farm, Incorporated Foundation
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- Enomoto Takashi
- The Research Institute of Bioresources, Okayama University
Bibliographic Information
- Other Title
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- 1995年に輸入された乾草中に混入していた雑草種子
- 1995ネン ニ ユニュウ サレタ カンソウ チュウ ニ コンニュウ シテ イタ ザッソウ シュシ
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Description
Imported agricultural materials are a principal source of exotic weed seed introductions into Japan. Increasing quantities of imported feed unintentionally contaminated with weed seeds have wreaked ecological havoc. We investigated contaminants in imported hay. During 6 months in 1995, all imported hay residue at a dairy corporation in Tochigi prefecture was collected and thoroughly inspected for weed seeds. One hundred fifty hay lots were examined;these included alfalfa, oat, orchard grass, timothy, wheat, fescue and sudangrass imported from Australia, Canada and U.S.A. When the number of seeds belonging to a single taxon was >10 in a lot, we subjected seeds to germination tests. About 60 plant species were identified in hay samples. Grass weed species were the major contaminants. The most abundant was wild oat, found in >50 lots, mostly oat hay from Australia. Ryegrass (Lolium sp.) was the second most abundant. Seeds of wild oat, Hordeum murinum, ryegrass, foxtail species, Vulpia and Portulaca oleracea were found to be viable in germination tests. Wild oat and ryegrass have been recently reported as problematic in the continuous winter cereal cropping system in central Japan, and both species are now also widely found growing on roadsides and riverbanks. Our results indicate that imported hay (as well as feed grains) is the probable source of this infestation.
Journal
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- Journal of Weed Science and Technology
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Journal of Weed Science and Technology 54 (4), 219-225, 2009
The Weed Science Society of Japan
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Details 詳細情報について
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- CRID
- 1390282679258099584
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- NII Article ID
- 130004829411
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- NII Book ID
- AN00097258
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- ISSN
- 18824757
- 0372798X
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- NDL BIB ID
- 10537703
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- Text Lang
- ja
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- Data Source
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- JaLC
- IRDB
- NDL
- Crossref
- CiNii Articles
- KAKEN
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- Abstract License Flag
- Disallowed