Study on the effective control of circular leaf spot under reduced number of spraying times
2017
Nomura, Y. | Adachi, M. | Watanabe, H. | Tsueda, H.
In Circular leaf spot control, reduction of fungicide spraying number using a pyraclostrobin-boscalid fungicide was effective. However, since a mixed fungicide as twice sprayed, it had been a problem that the four scatter in terms of the number of components. When used instead of DMI fungicides or a mancozeb fungicide, for showing the same control effect, it had become possible to control not to increase the component count. The main DMI fungicides, which had been registered as a Japanese persimmon, had a high control effect against Circular leaf spot in continuous spraying conditions at intervals of two weeks from mid June. Therefore, it was considered that the disinfection effect could be expected even if it was not applied, however, it was more effective than a tebuconazole fungicide which was used in the prefecture more than a difenoconazole fungicide was excellent. In the previous year, the effect of using QoI fungicides in late June was insufficient in the control of rotation in which the spraying of the disinfectant was omitted in May in May, although susceptibility deterioration was suspected, Considering the ascospores scattering, it was thought that the infection had been established from early on. For this reason, it was considered necessary to use the fungicide spraying at the end of May only for the spread field in the previous year. The fungicide spraying ended May was considered necessary.
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