00314nam a2200109Ia 450000500170000000800410001708200140005810000170007224500630008926000440015230000080019620260225051109.0260224s9999||||xx |||||||||||||| ||und||  a581.2 SIN  aR. S. Singh  0aIntroduction to principles of plant pathology 3rd edition.  aNew Delhi: IBH Publishing Co. Ltdc1984  a534