TY - JOUR AU - Sances, Frank V. AU - Toscano, Nick AU - Johnson, Marshall W. AU - LaPré, Larry F. TI - Pesticides may reduce lettuce yield JF - California Agriculture JO - Calif Agr Y1 - 1981/11/01 VL - 35 IS - 11 SP - 4 EP - 5 PB - University of California Agriculture and Nature Resources SN - 0008-0845 UR - http://www.ucanr.edu/sites/calagjournal/archive/?article=ca.v035n11p4 AB - Insecticides tested on lettuce as weekly or twice- weekly preventive treatments reduced yields by affecting plant physiology.