TY - JOUR AU - Yarwood, C. E. TI - Tillage increases plant diseases JF - California Agriculture JO - Calif Agr Y1 - 1969/03/01 VL - 23 IS - 3 SP - 4 EP - 6 PB - University of California Agriculture and Nature Resources SN - 0008-0845 UR - http://www.ucanr.edu/sites/calagjournal/archive/?article=ca.v023n03p4 AB - Tillage practices have contributed greatly to increasing crop production. However, speculation and controversy have surrounded such practices as to the question of whether tillage increases or decrease: the incidence of disease in the growing crop. This study substantiates recent investigations indicating that tillage does, in fact, generally increase the incidence of plant diseases.