[Development of a method for the valuation of resistance of carrots towards leaf infestation by Alternaria spp. and investigations on the identification of Alternaria spp. by isoenzym-variation of esterases]

alternaria biotest blatt daucus carota disease resistance dosage biologique ensayo enzym esterasas esterase esterases feuille fungi hojas identification identifizierung infection infektion isoenzimas isoenzyme isoenzymes leaves methode methods resistencia a la enfermedad testage testing