利用20余年的气候资料和病情数据,以逐步判别分析法将关中麦区各县(市)划分为三大气候区。长安、户县等13县(市)为有利发病气候区,岐山、凤翔等5县(市)为过渡气候区,蒲城、富平等8县为不利发病气候区。气候条件对发病的有利性在关中盆地自西向东渐次降低。在气候分区的基础上,根据地下水位与发病率的回归关系,进一步以乡镇为单位划分小麦赤霉病流行区。结果表明,203个乡镇为赤霉病严重区,111个为中度区,143个为轻度区。流行分区受气候和地下水因素制约,呈现比较复杂的地理格局。此结果为赤霉病分区治理提供了依据。 Using more than 20 years of climatological data and disease data, the counties (cities) in the Guanzhong wheat area are divided into three major climatic zones by stepwise discriminant analysis. Chang’an, Huxian and other 13 counties (cities) are favorable epidemic climates. Five counties (cities) such as Qishan and Fengxiang are transitional climatic zones, and eight counties such as Pucheng and Fuping are unfavorable epidemic climates. The favorable conditions for the onset of climate in the basin gradually decrease from west to east in the Guanzhong Basin. On the basis of climatic zonation, according to the regression relationship between groundwater level and incidence, further divide the district of wheat scab with the township as a unit. The results showed that 203 townships were seriously affected by FHB, 111 were moderate and 143 were mild. Popular sub-area by climate and groundwater constraints, showing a more complex geographical pattern. This result provided the basis for the scrub management of scab.