Burdon J J, Chilvers G A
Botany Department, Australian National University, P.O. Box 4, 2600, Canberra, A.C.T., Australia.
Oecologia. 1977 Jun;28(2):141-146. doi: 10.1007/BF00345249.
Controlled environment experiments on small epidemics of powdery mildew in mixtures of barley and wheat indicated that there was a relationship between the density of susceptible host units in the mixture and the rate of increase of disease within the stand best described by the equation: -r =r +clog m; where r and r are epidemic rates in a mixture and a susceptible monoculture of the same overall stand density, m is the proportion of host plants in the mixture, and c is a constant. By the use of appropriate controls, it was shown that most of the reduction in epidemic rates in mixtures was attributable to the reduction in density of susceptible host units. Interception of air-borne inoculum by immune plants played a relatively minor role, although extrapolation of the results suggests that this factor might become significant if there was a sufficiently high proportion of immune to susceptible plants present.
在大麦和小麦混合种植环境下对白粉病小规模流行进行的控制环境实验表明，混合物中感病寄主单位的密度与试验田中病害的增长率之间存在一种关系，这种关系用以下方程式描述最为恰当：-r = r + clog m；其中r 和r 分别是相同总种植密度的混合物和感病单一栽培作物中的流行率，m是混合物中寄主植物的比例，c是一个常数。通过使用适当的对照表明，混合物中流行率的大部分降低归因于感病寄主单位密度的降低。免疫植物对气传接种体的拦截作用相对较小，不过结果推断表明，如果免疫植物与感病植物的比例足够高，这个因素可能会变得显著。
