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Copyright of Journal of Forest & Environment is the property of Journal of Forest & Environment Editorial and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Agro-Environment Science is the property of Journal of Agro-Environment Science Editorial Board and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Nonferrous Metals Engineering is the property of Beijing Research Institute of Mining & Metallurgy Technology Group and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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Copyright of Journal of Agricultural Resources & Environment / Nongye Ziyuan yu Huanjing Xuebao is the property of Journal of Agricultural Resources & Environment Editorial Board and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Southern Agriculture is the property of Journal of Southern Agriculture and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Natural Gas Industry is the property of Natural Gas Industry Journal Agency and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

This stiady aimed to know the resistance to powdery mildew of major Pm genes used in China，and Chinese wheat commercial cultivars ，as well as foreign wheat materials. Field monitoring of 6 Pm genes，46 Chinese wheat cultivars and 66 foreign wheat materials in Li- cang，Dehong，Dali，Yuxi，Kunming and Zhaotong，Yunnan province had been carried out by natural identification during 2012 and 2013. The results indicated that the resistance of the 6 Pm genes had been lost gradually，decrease of the area of wheat carrying Pm8 and Pm21 is urgent. Pm2，Pm4a，Pm4b and Pm2 +6 should be used rationaiy. The resistance level of Chinese wheat commercial cultivar is very low. Among 46 cultivars，none of which showed resistant at 6 sites during the two years in Yunnan，6 cultivars showed susceptible only at one site，18 cultivars showed susceptible at 2 sites，22 cultivarr showed susceptible at 3 sites. Among 66 foreign wheat materials，only Hybrid 46 and Heines Kolben showed resistant at 6 sites during the 2 yearr in Yunnan，which indicated stable resistant. Seven materials showed susceptible only at 1 site，29 materials showed susceptible at 2 sites，28 materials showed susceptible at 3 sites. Those results indicated the lack of resistance sources and cultivars in China at present. Looking for new resistance sources and breeding new resistance cultivars are very urgent. The pressing matter of the moment is strengthening monitoring and emergency control， to ensure wheat security. [ABSTRACT FROM AUTHOR]