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Background : In previous study, we reported Sclerotium rot caused by Sclerotium rolfsii in Ixeridium dentatum for the first time. This experiment was conducted to select highly effective pesticides against Sclerotium rot caused by S. rolfsii in I. dentatum.
Methods and Results : The chemical efficacy and the injury test were carried out. A total of five pesticides were used for the experiment test. For the efficacy test, we investigated spore germination and mycelial growth inhibiting ability by each pesticides in vitro and disease inhibiting ability in the field. For the chemical injury, we investigated appearance of abnormalities on condition of reference amount and fold amount in the field. In vitro, three kinds of chemicals such as Fludioxonil suspension concentrate (SC), Tebuconazole suspension concentrate (SC), and Flutolanil emulsifiable concentrate (EC) showed complete spore germination inhibitory effect, However in two chemicals such as Pyraclostrobin water-dispersible granule (WG) and Pyribencarb suspension concentrate (SC), the mycelial growth inhibitory effect was partially recognized but the spore germination was not inhibited. In the field, we performed an artificial inoculation experiment using sclerotia. As a result four kinds of chemicals such as Fludioxonil SC, Tebuconazole SC, Flutolanil EC, and Pyraclostrobin WG showed control value of above 80% against Sclerotium rot caused by Sclerotium rolfsii except Pyribencarb SC. Also there was no chemical injury in reference amount and in fold amount respectively, compared to non treated control.
Conclusion : From the above results, we selected four items of pesticides including Fludioxonil SC, Tebuconazole SC, Flutolanil EC, and Pyraclostrobin WG as effective chemicals against Sclerotium rot caused by Sclerotium rolfsii in Ixeridium dentatum.
