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春季小麦条绣病在田块内、田块间及区域间的顺序传播距离按对数的加速度增加。根据调查资料,导出了不同侵染条件下的“菌量——传播距离”迥归公式为:一般侵染条件下:logD=0.1794+0.5838logS有利侵染条件(侵入前旬雨量>20毫米)下:logD=0.40+0.55logS不利侵染条件(侵入前干旱,旬雨量<3毫米)下:logD=-0.177+0.56logS其中:D=一次传播距离(公尺)。S=菌量,即病叶数×平均严重度。上面提出的初步公式只供计算在大面积地势平坦、一般风力、一般栽培条件下的感病品种麦田的田块内及田块间传播距离的参考。
Spring wheat streak in the field of plots, plots and inter-regional order of propagation distance according to the acceleration of the logarithmic increase. According to the survey data, the formula of regression equation of “the amount of bacteria-propagation distance” under different infection conditions is derived as follows: under normal infection conditions: logD = 0.1794 + 0.5838logS favorable infection conditions (rainfall of> Under: logD = 0.40 + 0.55 logS Adverse infestation conditions (pre-invasion drought, ten-day rainfall <3 mm): logD = -0.177 + 0.56 logS where: D = distance traveled in meters. S = amount of bacteria, namely the number of diseased leaves × average severity. The initial formula proposed above is only used as a reference to calculate the propagation distance within and between fields of susceptible cultivars under the general cultivation conditions in a large area of flat terrain, general wind power and general cultivation conditions.