本所对小麦条锈病流行行的系统观测,系自1948年开始,经过六年的观察,我们在流行预测方面,得出初步结论,现在分述如下:一、几年来以北京为中心观察结果:1948年夏季 5月6日发现,后期发生普遍但很轻微,对小麦产量无影响。1948—1949年幼苗条锈病在10月8日发现,后期发生至40%;翌年在5月1日发现,至小麦收种时发展到50%,对小麦产量影响轻微。1949-1950年幼苗条锈病在10月10日发现,后期发生至90%;翌年在3月29日即发现,极 Our systematic observation of the prevalence of stripe rust in wheat has been based on six years of observation since 1948. We have reached preliminary conclusions in the field of epidemic prediction and are summarized as follows: 1. The results of Beijing-centered research over the past few years May 1948 Summer May 6 found that the late occurrence of a general but very slight, no impact on wheat yield. Seedling stripe rust was found on October 8 from 1948 to 1949 and occurred to 40% late; on May 1 the following year it was found that up to 50% of wheat was harvested at the time of planting, with little effect on wheat yield. From 1949 to 1950, seedling stripe rust was found on October 10 and later occurred to 90%. The following year, on March 29, it was found that the pole