Abstract
Field studies were conducted during four consecutive tomato (Lycopersicon esculentum Mill.)-cucumber (Cucumis sativus L.) rotations to examine the long-term residual effects of tomato methyl bromide (MBr) alternatives on nutsedge (Cyperus rotundus L. and C. esculentus L.) populations in double-cropped cucumber. Four treatments were established in tomato fields: a) non-treated control; b) MBr + chloropicrin (Pic) (67:33 w/w) at a rate of 350 lb/acre; c) tank-mixed pebulate + napropamide at 4 and 2 lb/acre, respectively, followed by 1,3-dichloropropene (1,3-D) + Pic (83:17 v/v) at 40 gal/acre; and d) napropamide at 2 lb/acre followed by soil solarization for 7 to 8 weeks followed by broadcast application of paraquat at 0.5 lb/acre prior to planting tomatoes. For nutsedge densities, napropamide followed by solarization and paraquat had control equal to MBr + Pic ( = 1.5 plants/ft) during all four cropping seasons. Cucumber plant vigor ratings for pebulate + napropamide followed by 1,3-D + Pic were comparable to MBr + Pic. Marketable yield data proved that fumigation of tomato fields with either MBr + Pic or pebulate + napropamide followed by 1,3-D + Pic had an extended influence on doublecropped cucumber.
