PROCESS FOR PREPARING PYRIDAZINONE DERIVATIVES, AND INSECTICIDAL, ACARICIDAL, NEMATICIDAL, FUNGICIDAL COMPOSITIONS

A 3(2H)-pyridazinone derivative of the general formula (I):whereinR is a straight or branched C2 -C6 alkyl,A is a straight or branched C, -C6 alkyl or a halogen atom,X is -O-or -S-,R' and R2 are each independently hydrogen atom or C, -C3 alkyl,-N-B is -CH = CH-, -N = CH-. -N = N-, -S-, -O-or- wherein R3 is hydrogen or C. -C3 alkyl, RY is a halogen atom, a straight or branched C, -C6 alkyl, a C3 -C6 cycloalkyl or cycloalkoxy, a straight or branched C, -C6 alkoxy or alkylthio, a straight or branched C, -C6 alkysulfinyl or alkylsulfonyl, a C, - C4 haloalkyl or haloalkoxy, a C. -C4 haloalkylthio. a C2 -C4 alkoxycarbonyl, trimethylsilyl. a C -C4 alkoxylcarbonyl, dimethylamino, nitro, cyano, wherein Z is a halogen atom, a straight or branched C, -C6 alkyl or alkoxy, a C3 -C6 cycloalkyl, a C, -C4 haloalkyl, a C. -C4 alkoxycarbonyl or nitro, ℓ is 0 or an integer of 1 to 5, and when t is a number of 2 to 5, Z may be same or different, orY is -O-W, W is a group of the formula:in which R4, R5 and R6 are each independently hydrogen atom or a C, -C4 alkyl.R' is C, -C3 hydrogen atom or an alkyl or alkoxyl,R6 is a straight or branched C, -C6 alkyl, a C3 -C6 cycloalkyl or a C3 -C6 alkenyl or alkynyl,E is -O-, -S-, -SO-, -SO2-,-or-, wherein R' is a straight or branched C1-C4 alkyl, or R8 and R' together may form 5-or 6-membered ring.m is 0 or an integer of 1 to 3, n is 0 or an integer of 1 to 3, and when n is 2 or 3, Y may be same or different, with the proviso that when B is - CH=CH-, n is an integer of 1 to 3 and at least one of Y is -0-W.A process for preparation of said derivatives is also provided. These derivatives are useful as an active ingredient of insecticidal, acaricidal, nematicidal and/or fungicidal compositions for agricultural and horticultural uses as well as of expellent compositions for ticks parasitic on animals.