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高粱苗期病害主要是由立枯丝核菌(Rhizoctonia solani)AG—5引起的土壤传染病害,该病害的病原菌土下分布状况可以通过病株、病斑的分布型间接地测定。病株为随机分布,而病斑则属于核心分布,但也符合负二项分布.病株分布型反映土内病菌的随机存在,病斑分布型则主要反映了病菌在土内接种势能的不均一分布(聚集分布)。以上结果为在病害调查中确定取样方式与样本大小提供了理论基础。
The sorghum seedling disease is mainly caused by Rhizoctonia solani AG-5, and the soil distribution of the disease pathogen can be determined indirectly by the diseased plants and diseased spots. The diseased plants were randomly distributed, while the diseased spots belonged to the core distribution, but they also met the negative binomial distribution.The distribution of diseased plants reflected the random existence of pathogens in the soil, while the distribution of lesion mainly reflected the inoculation potential of bacteria Uniform distribution (aggregation distribution). The above results provide a theoretical basis for determining the sampling method and sample size in the disease investigation.