TY - JOUR AU - Johnson, Marshall W. AU - Kido, Ken AU - Toscano, Nick AU - Van Steenwyk, Robert AU - Welter, Steve C. AU - McCalley, Norman F. TI - Strategies for managing lepidopterous pests on lettuce JF - California Agriculture JO - Calif Agr Y1 - 1984/01/01 VL - 38 IS - 1 SP - 6 EP - 8 PB - University of California Agriculture and Nature Resources SN - 0008-0845 UR - http://www.ucanr.edu/sites/calagjournal/archive/?article=ca.v038n01p6 AB - It isn't necessary to keep the crop insect-free during the entire growing season