00416nam a2200133Ia 4500008004100000082002300041100002300064245005900087260005500146300001000201600002000211600002000231650003100251140113s9999    xx            000 0 und d  a632.7 / .51:633 L7  a" Cherrett, J. M."  a"Origins of pest, parasite, disease and weed problems"  b"Oxford : Blackwell scientific publications, 1977"  a413p.  a" Sagar, G. R."  a" Sagar, G. R."  a"Diseases, pest and weeds"