2. リンゴ斑点落葉病の多発生要因の疫学的解析に基づく防除体系の確立

概要

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We describe the epidemiological study designs, a case-control study, which assist in identification of the factors associated with plant disease problems and suggest good strategies for disease control. To generate a causal hypothesis for an association between the disease severity of Alternaria blotch of apple before early July and subsequent severity in late July, a nested case-control study was carried out using 13 years of severity data (1993-2005) from Iwate Prefecture, Japan. The result reveals a highly probable causality between disease severity at the early (late June or early July) and at the late phases (late July) of the epidemics under conventional orchard management. Field testing for two years showed that late June applications of effective fungicides could protect against disease incidence until late July. These results suggest that the nested case- control study could apply to determination of critical timings to control Alternaria blotch efficiently in various regions.
EBC研究会の論文