Composition for the control of plant diseases comprising (Group a) (a) at least one type of a quinoline compound selected from the group consisting of: (a-14) 3- (5-fluoro-3,3, 4,4-tetramethyl-3,4-dihydroisoquinolin-1-yl) quinoline, (a-18) 3- (4,4-difluoro-3,3-dimethyl-3,4-dihydroisoquinolin-1-yl) quinoline, and (a-20) 3- (4,4,5-trifluoro-3,3-dimethyl-3,4-dihydroisoquinolin-1-yl) quinoline, or a salt thereof, or a salt thereof, and ( Group b) (b) one or more fungicides selected from the group consisting of the following groups mentioned: Group (1) a compound of the strobilurin family selected from (b-1-1) Azoxystrobin (b-1-2) Methyl-Kresoxim (b-1-3) Pyraclostrobin (b-1-4) Picoxystrobin (b-1-5) Fluoxastrobin (b-1-6) Dimoxystrobin (b-1-7) Orisastrobin (b-1-8) Metominostrobin and (b-1-9) Trifloxystrobin, Group (2) a compound of a family of triazoles selected from (b-2-1) Simeconazole (b-2-2) Tebuconazole (b-2-3) Fenbuconazole ( b-2-4) Hexac onazol (b-2-5) Imibenconazole (b-2-6) Triadimefón (b-2-7) Tetraconazole (b-2-8) Protioconazole (b-2-10) Epoxiconazole (b-2-11) Ipconazole ( b-2-12) Metconazole (b-2-13) Propiconazole (b-2-14) Ciproconazole (b-2-15) Diphenoconazole (b-2-17) Fluquinconazole (b-2-18) Flusilazol (b- 2-19) Penconazole (b-2-21) Triadimenol (b-2-22) Flutriafol and (b-2-23) Miclobutanil, Group (3) a compound of a family of imidazoles selected from (b-3- 1) Oxpoconazole fumarate (b-3-2) Triflumizol (b-3-3) Imazalil and (b-3-5) Prochloraz, Group (4) a compound of a family of carboxamides selected from (b-4- 1) Pentiopirad (b-4-2) Flutolanil (b-4-3) Furametpir (b-4-4) Boscalide (b-4-5) Fenhexamide (b-4-6) Ciflufenamide (b-4-8) Mandipropamide (b-4-9) Bixafen (b-4-10) Carboxin (b-4-14) Tifluzamide (b-4-16) Etaboxam (b-4-17) Zoxamide (b-4-18) Thiadinyl ( b-4-19) Isothianyl (b-4-22) Fluopicolide (b-4-23) Fluopiram (b-4-26) N- [2- (1,3-dimethylbutyl) phenyl] -5-fluoro-1 , 3-dimethyl-1H-pyrazol-4-carboxamide (b-4-27) N- { 2- [1,1'-bi (cyclopropyl) -2-yl] phenyl} -3-
