陇南和阿坝地区小麦条锈菌传播的研究

 研究结果表明,甘肃陇南越夏区条锈菌源的主要传播路线是沿康县至略阳的近正西气流轨道和文县至广元的西北气流轨道,主要对汉中地区和绵阳的大多数地区小麦秋苗吹送,并可波及陕西安康地区和商洛部分地区及四川达县和万县等地。四川阿坝州越夏区菌源的主要传播路线是沿汶川至灌县的西北偏北气流轨道。其菌源与成都平原麦区的关系密切,对绵阳地区的北川、平武和绵竹等地也很重要,并可波及南充、内江及江汉流域等地区。湖北秋苗的初始菌源多来自西北越夏区。

ON THE DISPERSAL OF WHEAT STRIPE RUST (PUCCINIA STRIIFORMIS WEST.) IN LONGNAN PREFECTURE AND ABAZHOU

Longnan prefecture of Gansu province and Abazhou of Sichuan provi-nce,where stripe rust of wheat caused by Puccinia striiformis often occurs frequently,are importan toversummering areas of wheat stripe rust in China.Field surveys and tests on the dispersal of wheat stripe rust were carried out in Lnognan and Aba District during 1979-1984.In the major dispersal trackof oversummering inoculum of stripe rust in Longnan,there are two pathways,i.e.nearwestward trajectory of airflow from Kang county to Lueyang county and southwestward trajectory of airflow from Wen county to Guangyuan county.The oversummering inoculum in this area is mainly blown by wind toward the autumn-sown wheat seedlings in Hanzhong and major parts of Mianyang prefectures,and also can be spread to Ankang and part of Shangluoprefectures in Shanxi province,Da county and Wan county in Sichuan province ect.The major dispersal track of oversummering inoculum in Abazhou of Sichuan province is along northwestward by northward trajectory of airflow from Wenchuan county to Guan county.Inoculum within this areahas in close conne ction with wheat region in Chengdu plain and also is an important source of inoculum for autumn-sown wheat seedlings in Beichuan,Pingwu and Mianzhu counties of Mianyang prefecture.And it can be spread to Neijiang,Nanchong prefectures and Jianghan river basin and so on.The initial inoculum sources of stripe rust at autumn-sown wheat seedlings in Hubei province most likely come from northwestern oversummering area.So,it is very important to control the stripe rust of wheat in Longnan and Aba oversummering area.