EFFECTS OF REDUCED RATES OF TELONE C35 AND METHYL BROMIDE IN CONJUNCTION WITH VIRTUALLY IMPERMEABLE FILM ON WEEDS AND ROOT-KNOT NEMATODES
Keywords: 1, 3-dichloropropene, chloropicrin, cucumber, Cyperus spp., K-Pam, Meloidogyne spp., metam potassium, methyl bromide, nutsedge, root-knot nematode, Telone C35, squash, tomato, virtually impermeable film, VIF
AbstractHamill, J. E., J. E. Thomas, L.-T. Ou, L. H. Allen, Jr., N. Kokalis-Burelle, and D. W. Dickson. 2008. Effects of reduced rates of Telone C35 and methyl bromide in conjunction with virtually impermeable film on weeds and root-knot nematodes. Nematropica 38:37-46. Two field trials were conducted in Florida in 2004 to test the efficacy of reduced rates of the fumigants methyl bromide (67% methyl bromide plus 33% chloropicrin) and Telone C35 (1,3-dichloropropene (1,3-D), 65% plus chloropicrin 35%) in combination with virtually impermeable film (VIF) and standard low density polyethylene (LDPE) film. In spring grown tomato, reducing rates of methyl bromide by 25% under VIF provided comparable control to full rates with regard to nutsedge (mixture of purple and yellow). All fumigants performed better with regard to nutsedge control under VIF than under LDPE. Root-galling, caused by Meloidogyne spp. juveniles (J2) in soil, and marketable yields in reduced rates of methyl bromide were also similar to the full rate regardless of film type. Plots treated with Telone C35 at 327 liters/ha in conjunction with VIF reduced nutsedge densities, had lower gall ratings, and had higher marketable yields than nontreated plots, but were not comparable to methyl bromide. Reducing rates of Telone C35 by 25 and 50% had negative impacts on yield compared to all methyl bromide treatments and Telone C35 at 327 liters/ha, regardless of film type. In double-cropped cucumber, none of the treatments had gall-ratings different than nontreated plots. In autumn grown squash, all methyl bromide treatments and Telone C35 treatments had higher marketable yields and lower gall ratings than nontreated plots. Plots treated with Telone C35 using VIF had the lowest nutsedge densities. All methyl bromide treatments under VIF had lower nutsedge densities than nontreated plots. Plots that were treated with chloropicrin or chloropicrin plus metam potassium as an in-bed treatment had higher nutsedge densities than nontreated plots.