A study was conducted to compare the effect of 1,3-dichloropropene (1,3-D) chloropicrin (Pic) in a 83:17 ratio (C-17) used alone or in combination with herbicides on tomato. Treatments evaluated included 1,3-D (325 kg ai/ha) plus Pic (67 kg ai/ha) used either alone or with pebulate (4.5 kg ai/ha), napropamide (4.5 kg ai/ha), metolachlor (1.1 and 2.3 kg ai/ha), lactofen (2.3 kg ai/ha), or flazasulfuron (0.4 kg ai/ha). Pebulate was consistently more effective in controlling purple nutsedge than the other herbicides tested. Purple nutsedge was more effectively controlled with C-17 in combination with pebulate than with the fumigant alone. Shallow incorporation of pebulate failed to improve weed control and tomato fruit yield.
Nomenclature: Chloropicrin; 1,3-dichloropropene; flazasulfuron; lactofen; metolachlor; napropamide; pebulate; purple nutsedge, Cyperus rotundus L. #3 CYPRO; tomato, Lycopersicon esculentum Mill. ‘Solar Set’.
Additional index words: Flazasulfuron, lactofen, methyl bromide, metolachlor, napropamide, pebulate, soil fumigant.
Abbreviations: C-17, 1,3-D Pic (87:13); 1,3-D, 1,3-dichloropropene; MBr, methyl bromide; Pic, chloropicrin; WAT, weeks after treatment.
