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4252675 
Journal Article 
Allyl Isothiocyanate: A Methyl Bromide Replacement in Polyethylene-Mulched Bell Pepper 
Bangarwa, SK; Norsworthy, JK; Gbur, EE; Zhang, J; Habtom, T 
2011 
1 
Weed Technology
ISSN: 0890-037X
EISSN: 1550-2740 
25 
1 
90-96 
WOS:000287679500015 
Methyl bromide has been a key fumigant for broad-spectrum weed control in polyethylene-mulched bell pepper. However, the ozone-depleting nature of methyl bromide has led to its scheduled phaseout from U.S. agriculture. Thus, an effective alternative to methyl bromide is needed. Field trials were conducted in 2007 and 2009 to evaluate the crop response and weed control efficacy of allyl isothiocyanate (ITC) in polyethylene-mulched bell pepper. The experiment included various combinations of two mulch types (low density polyethylene [LDPE] and virtually impermeable film [VIF] mulch) and six rates of allyl isothiocyanate (0, 15, 75, 150, 750, 1,500 kg ha(-1)). Additionally, a standard treatment of methyl bromide/chloropicrin (67 : 33%) at 390 kg ha(-1) under LDPE mulch was included for comparison. Bell pepper injury was < 3% in all treatments, except 11% injury at 1,500 kg ha(-1) allyl isothiocyanate under VIF mulch at 2 wk after transplanting (WATP). VIF mulch did not provide additional weed control and marketable pepper yield over LDPE mulch. Allyl isothiocyanate at 932 (+/- 127) kg ha(-1) controlled yellow nutsedge (90%), Palmer amaranth (97%), and large crabgrass (92%) through 6 WATP and maintained the marketable yield equivalent to methyl bromide treatment. This research demonstrates that allyl ITC under an LDPE mulch can serve as a potential alternative to methyl bromide for weed control in polyethylene-mulched bell pepper. 
Integrated weed management; methyl bromide alternative; soil fumigation