Nutsedge resurgence in double-cropped cucumber after methyl bromide chemical alternatives and solarization in tomato

James P. Gilreath, Timothy N. Motis, Bielinski M. Santos

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.

Keywords


cyperus; nutsedge; soil fumigant; 1,3-dichloropropene; pebulate; napropamide

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Proc. Fla. State Hort. Soc.     ISSN 0886-7283