00286nam a2200109Ia 4500008004100000082001500041100002200056245003400078260003400112300001000146650002000156140113s9999    xx            000 0 und d  a632.314 J0  a" Gaumann, Ernst"  aPrinciples of plant infection  b"Crosby lockwood & son, 1950"  a543p.  aPlant pathology