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对长春市百日草白粉病病斑在叶片上的空间分布型研究结果表明,在百日草白粉病发病初期,叶片上病斑的空间分布型为聚集分布,后随着病害发生程度加重,病斑的聚集程度逐渐变弱。当每片叶上病斑数达到70个以上时,病斑的分布型转变为均匀分布。对百日草白粉病的理论抽样数研究结果表明,在每片叶上有1~5个病斑的常见发病条件下,若想获得较为精确的调查结果,需要调查260~1 300片叶;如果想获得大体准确的调查结果,仅需调查67~342片叶即可。当每片叶上的病斑数达到几十个的发病条件时,若想获得较为精确的调查结果,需要调查20~130片叶;如果想获得大体准确的调查结果,仅需调查5~33片叶即可。根据研究结果制定了指导防治工作的序贯抽样检索表。
The results showed that the spatial distribution patterns of the blight spots on leaves were aggregated and distributed at the early stage of the occurrence of Z. japonica powdery mildew. With the increase of disease occurrence, Lesions of lesion aggregation gradually weakened. When the number of lesions per leaf reached more than 70, the distribution of lesions transformed into uniform distribution. The theoretical sampling number of Zinnia elegans powdery mildew showed that there were 260 ~ 1300 leaves needed to be surveyed if there were 1 ~ 5 lesions on each leaf in order to obtain more accurate results. If you want to get a more accurate survey, you only need to investigate 67 ~ 342 leaves. When the number of lesions on each leaf reaches dozens of disease conditions, 20 to 130 leaves need to be surveyed to obtain a more accurate survey result. To obtain a more accurate survey result, only 5 to 33 Leaf can be. According to the results of the study developed a sequential sampling search table.