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一病虫发生趋势的估计我区去冬雨雪少,气温偏高,冬灌地区的土壤结冻此往年推迟15～20天,且冻结后气候暖和,冻结层浅;致使病虫的越冬死亡率低,遗留下大量的虫源和菌源。如银川检查田边苍耳平均每株有越冬玉米螟幼虫2.09条,最高的达19条,越冬死亡虫数是个别的;我区锈病菌业源的陇东地区,今年越冬锈病菌孢子很多。据气象预报:今年2～9月的降雨量比1964年
Estimation of the trend of occurrence of pests and diseases In our district, there is little rain and snow in winter and high temperatures. The soil freezing in the winter irrigation area was postponed 15 to 20 days in previous years and the climate after the freezing is warm and the freezing layer is shallow. The overwintering mortality of pests and diseases Low, leaving a large number of insect and bacteria sources. Such as Yinchuan Tanabata cocklebur average per plant overwintering corn borer larva 2.09, the highest of 19, the number of overwintering dead insects are individual; my area rust source of the disease in eastern Gansu province this year, many winter rust spores. According to the weather forecast: rainfall from February to September this year than in 1964