Soil fumigant evaluations for soilborne pest and Cyperus rotundus control in fresh market tomato

Field trials were conducted in tomato (Lycopersicon esculentum Mill.) to determine the efficacy of combinations of fungicides, nematicides, and herbicides on soilborne pest and Cyperus rotundus L., in comparison with methyl bromide+ chloropicrin (MBr + Pic). Fumigants were: (a) MBr + Pic (98:2, respectively) at a rate of 450 kg/ha, (b) Pic at 225 kg/ha, (c) metam sodium (MNa) at 9451/ha, (d) dazomet at 400 kg/ha, (e) dazomet at 510 kg/ha, (f) 1,3-D+Pic (C-17, at 83:17, respectively)+pebulate at rates of 2001/ha and 4.5kg/ha, respectively, (g) C-17+pebulate at 3301/ha and 4.5kg/ha, respectively, and (h) fosthiazate+MNa+pebulate at rates of 4.2 kg/ha, 9451/ha, and 4.5 kg/ha, respectively. The results indicate that season-long control of purple nutsedge could be consistently achieved with G 17 + pebulate at either dose, or fosthiazate + MNa + pebulate, in addition to MBr + Pic. Nematode root galling was steadily reduced by dazomet at a rate of 5 10 kg/ha, G 17 + pebulate at either rate, or fosthiazate + MNa + pebulate. All these treatments provided the same nematode control than MBr+Pic. Only C-17+pebulate at either 3301+4.5kg/ha or 2001+ 4.5 kg/ha was consistently equal to MBr + Pic on tomato fruit weight. (C) 2004 Elsevier Ltd. All rights reserved.