| abstract |
A pyrazine compound of the formula: <IMAGE> wherein R1 and R2 are hydrogen, or optionally-substituted hydrocarbyl, aryloxy or alkoxy and R2, additionally may be pyridyl, thienyl or furyl; R3 and R4 are H, alkyl or aryl or together form a bridging group; Z is: <IMAGE> where R5 is H, alkyl or aryl; and functional derivatives and salts thereof. The compounds are useful for combating fungal or bacterial diseases in plants. |