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灰翅麦茎蜂的生物学及其防治对策   总被引:1,自引:1,他引:0  
针对近年来在青海省和甘肃省春小麦生产中灰翅麦茎蜂Cephus fumpennis Eversmann的危害造成春小麦千粒重下降8~10g,严重减产,籽粒品质变差,麦秆失去使用价值等问题,介绍了麦茎蜂的分布、主要生物学特征(形态特征和生活习性等)和目前的主要防治对策,包括耕作措施(深翻、轮作倒茬)、药剂、生物防治及选育抗虫小麦新品种。  相似文献
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Bracon lissogaster Mues., a key parasitoid of Cephus cinctus Norton in northern Montana USA, is reported in Canada for the first time. Resurgence of C. cinctus in Alberta and Saskatchewan has led to renewed interest in biological control of this cereal pest in Canada.  相似文献
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1 Adult wheat stem sawflies Cephus cinctus, pests of cultivated cereals that also infests wild grasses, migrate into wheat fields where they oviposit in elongating, succulent stems.
2 Volatiles released by wheat plants at susceptible stages were analyzed to determine potential semiochemical compounds. Seven major compounds were identified and quantified.
3 A Y-tube bioassay was developed to evaluate upwind orientation of adult sawflies in response to an airstream that passed over elongated wheat plants. The bioassay was also conducted with synthetic volatile compounds. The compounds were tested using a range of concentrations spanning those identified in the airstream passing over wheat plants.
4 A significant number of adult females were attracted to wheat plants when given a choice of either purified air or the air passing over plants.
5 A significant number of female C. cinctus were attracted to ( Z )-3-hexenyl acetate, β-ocimene, and ( Z )-3-hexen-1-ol, but were repelled by 6-methyl-5-hepten-2-one. Females did not respond to ( E )-2-hexenal, or ( E )-2-hexenyl acetate. The behavioural responses were concentration dependent; the highest tested concentration of ( Z )-3-hexenyl acetate was repellent to females of this species.
6 Adult males did not discriminate between air passing over wheat plants and air from a purified airstream. Males did not respond to any tested synthetic compound at any concentration.
7 The present study demonstrates for the first time that adult females of wheat stem sawfly display innate behaviours in response to synthetic volatiles. These results provide a basis for the potential development of resistant wheat varieties and for the development of semiochemically-based pest management.  相似文献
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