| 摘要 |
Novel pyridine, pyrazine and pyrimidine derivatives of the formula <IMAGE> I wherein R, R1, R2, R3 and R4 are as hereinafter set forth, and acid addition salts thereof, processes for their preparation, fungicidal compositions containing these compounds as the active ingredient as well as the use of such compounds or compositions for the control of fungi in agriculture and in horticulture are disclosed. |
