一、发生与为害: 小麦颖枯病在本区雅鲁藏布江中、下游地区的米林、林芝的波密、加查、朗县、易贡等地都有发生,一般发病率为5—8％,发病严重的地块可达10—15％。近年来,在拉萨市郊县和山南地区的部分县也曾采到标本,但其发病程度却较轻。小麦颖枯病在本区主要为害粒部,尤其是穗顶端及中央部分,上部叶片特别是旗叶亦有为害。发病后,受害部位的功能受削弱或丧失,使穗粒数和千粒重下降、品质变 First, the occurrence and damage: wheat flaky blight in the Brahmaputra in the region, the downstream area of ​​Milin, Nyingchi Bomi, Canada Cha, Lang County, Yigong and other places have occurred, the general incidence of 5-8% The incidence of serious land up to 10-15%. In recent years, specimens have also been collected in some counties in the suburbs of Lhasa and Shannan, but their incidence is relatively mild. Wheat leaf blight in the area mainly for the Ministry of pests, especially the spike tip and the central part of the upper leaves, especially the flag leaves are also harmful. After the onset of the affected parts of the affected by the weakening or loss of grain number and grain weight per thousand decreased quality change