TY - JOUR AU - Radewald, J. D. AU - Mowbray, P. G. AU - Paulus, A. O. AU - Shibuya, Fujio AU - Rible, J. M. TI - Preplant soil fumigation increases head weights in California lettuce JF - California Agriculture JO - Calif Agr Y1 - 1969/08/01 VL - 23 IS - 8 SP - 11 EP - 13 PB - University of California Agriculture and Nature Resources SN - 0008-0845 UR - http://www.ucanr.edu/sites/calagjournal/archive/?article=ca.v023n08p11 AB - Preplant bed fumigation of lettuce soils significantly increased lettuce head weights in three Palo Verde field trials with DD and Telone. Treatments also produced trends toward more uniform and earlier crop maturity (although differences were not statistically significant). The reasons for the beneficial responses are not completely understood, but the responses were at least partly accounted for by the control of two nematodes, Tylenchorhynchus clarus and Meloidognye hapla.