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关中灌区自60年代中期以后小麦赤霉病渐趋严重,现已成为灌区小麦稳产的重要限制因素和主要防治对象。关中灌区可初步划分为渭河川道平原和黄土台原二个流行区;前者为主要流行区,流行频率高,以其西部为例,10年中大致有3～5年发生中度以上流行。研究表明农田灌溉引起的农田生态条件变化和大面积种植感病品种是赤霉病流行的基本前提,复种玉米面积扩大和田间遗留较多带菌残秆,提供了赤霉病流行的菌源基础。在以上条件具备的
Since the middle of the mid-1960s, the wheat scab in Guanzhong irrigation area has become increasingly serious and has become an important limiting factor and main control object of stable wheat production in irrigation areas. Guanzhong Irrigation District can be divided into two main areas: the Weihe River Plain and the Loess Plateau. The former is the main epidemic area with high prevalence frequency. Taking the western region as an example, it has been moderately popular for about 3-5 years in 10 years. The results showed that the changes of farmland ecological conditions caused by farmland irrigation and the cultivation of susceptible cultivars in large area were the basic prerequisites for the epidemic of scab. The area of multiple cropping corn and the more residual stumps left in the field provided the basis of bacterial source. Have the above conditions