Physical, chemical and environmental properties of selected chemical alternatives for the pre‐plant use of methyl bromide as soil fumigant

Ruzo, Luis O.

doi:10.1002/ps.1135

Cited by 115 publications

(88 citation statements)

References 91 publications

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“…However, previous observations have clearly reported the incompatibility interactions between different fumigants (Ruzo, 2006). Simultaneous presence of metam-sodium with halogenated fumigants in polar organic solvents or moist soil (Guo et al, 2005) give rise to rapid degradation of the halogenated fumigants and to decomposition of metam to methyl isothiocyanate.…”

Section: Discussionmentioning

confidence: 95%

“…This prompts the Montreal Protocol on Substances That Deplete the Ozone Layer to eliminate this substance (Bell, 2000;UNEP 2000;Yates et al, 2003;Caddick, 2004). In addition to environmental concerns, there are serious questions regarding methyl bromide toxicology and risk assessment (Ruzo, 2006). Although the principal target site for methyl bromide seems to be the central nervous system, its precise mechanism of toxicity is unclear (Yang et al, 1995).…”

mentioning

confidence: 99%

“…To date, the methyl bromide consumption in these countries is less than 12% of the baseline defined by consumption in 1991 (UNEP, 2006). Consequently, many chemicals [e.g., 1,3-D (TELONE II), chloropicrine (TELONE C-35, InLine), and metam-sodium, which is a recognized precursor to the formation of methyl isothiocyanate (VAPAM HL, BASAMID in soils)] and physical alternatives have been proposed as replacements for methyl bromide (Fields and White, 2002;Martin, 2003;Tomlin, 2003;Ruzo, 2006;UNEP, 2006).…”

mentioning

confidence: 99%

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Calcium-Activated Potassium Channels in Insect Pacemaker Neurons as Unexpected Target Site for the Novel Fumigant Dimethyl Disulfide

Gautier¹,

Auger²,

Legros³

et al. 2007

J Pharmacol Exp Ther

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Dimethyl disulfide (DMDS), a plant-derived insecticide, is a promising fumigant as a substitute for methyl bromide. To further understand the mode of action of DMDS, we examined its effect on cockroach octopaminergic neurosecretory cells, called dorsal unpaired median (DUM) neurons, using whole-cell patch-clamp technique, calcium imaging and antisense oligonucleotide strategy. At low concentration (1 M), DMDS modified spontaneous regular spike discharge into clear bursting activity associated with a decrease of the amplitude of the afterhyperpolarization. This effect led us to suspect alterations of calcium-activated potassium currents (IKCa) and [Ca 2ϩ ] i changes. We showed that DMDS reduced amplitudes of both peak transient and sustained components of the total potassium current. IKCa was confirmed as a target of DMDS by using iberiotoxin, cadmium chloride, and pSlo antisense oligonucleotide. In addition, we showed that DMDS induced [Ca 2ϩ ] i rise in Fura-2-loaded DUM neurons. Using calcium-free solution, and (R,S)-(3,4-dihydro-6,7-dimethoxy-isoquinoline-1-yl)-2-phenyl-N, N-di-[2-(2,3,4-trimethoxy-phenyl)ethyl]-acetamide (LOE 908) [an inhibitor of transient receptor potential (TRP)␥], we demonstrated that TRP␥ initiated calcium influx. By contrast, -conotoxin GVIA (an inhibitor of N-type high-voltage-activated calcium channels), did not affect the DMDS-induced [Ca 2ϩ ] i rise. Finally, the participation of the calcium-induced calcium release mechanism was investigated using thapsigargin, caffeine, and ryanodine. Our study revealed that DMDS-induced elevation in [Ca 2ϩ ] i modulated IKCa in an unexpected bell-shaped manner via intracellular calcium. In conclusion, DMDS affects multiple targets, which could be an effective way to improve pest control efficacy of fumigation.

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Section: Discussionmentioning

confidence: 95%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Calcium-Activated Potassium Channels in Insect Pacemaker Neurons as Unexpected Target Site for the Novel Fumigant Dimethyl Disulfide

Gautier¹,

Auger²,

Legros³

et al. 2007

J Pharmacol Exp Ther

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“…Following the phase-out of methyl bromide (MBr), dazomet (DZ) provided a widespread approach for improving the effectiveness of soil disinfestations [1][2][3]. In moist soil, DZ rapidly decomposes to its active ingredient, methyl isothiocyanate (MITC), which is toxic to soil-borne pests, especially fungi, some soil arthropods, and ectoparasitic nematodes [4,5].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Two Types of Biochars on the Efficacy, Emission, Degradation, and Adsorption of the Fumigant Methyl Isothiocyanate

et al. 2016

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Biochar (BC) is increasingly applied in agriculture; however, due to its adsorption and degradation properties, biochar may also affect the efficacy of fumigant in amended soil. Our research is intended to study the effects of two types of biochars (BC-1 and BC-2) on the efficacy and emission of methyl isothiocyanate (MITC) in biochar amendment soil. Both types of biochars can significantly reduce MITC emission losses, but, at the same time, decrease the concentration of MITC in the soil. The efficacy of MITC for controlling soil-borne pests (Meloidogyne spp., Fusarium spp. Phytophthora spp., Abutilon theophrasti and Digitaria sanguinalis) was reduced when the biochar (BC-1 and BC-2) was applied at a rate of higher than 1% and 0.5% (on a weight basis) (on a weight basis), respectively. However, increased doses of dazomet (DZ) were able to offset decreases in the efficacy of MITC in soils amended with biochars. Biochars with strong adsorption capacity (such as BC-1) substantially reduced MITC degradation rate by 6.2 times, and increased by 4.1 times following amendment with biochar with high degradability (e.g., BC-2), compared to soil without biochar amendment. This is due to the adsorption and degradation of biochar that reduces MITC emission losses and pest control.

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“…by various scientists, showing effectiveness of methyl bromide in controlling and eradicating P. ramosa [24] [25] [26]. Although methyl bromide is very effective in eradicating and killing Phelipanche spp., it is not economical for broad application, and poses significant environmental impacts [27].…”

Section: Greenhouse Experiments 2009/10mentioning

confidence: 99%

Phelipanche aegyptiaca Management with Glyphosate in Potato

Haidar

Shdeed²

2015

AJPS

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Two years field and greenhouse studies were carried out to evaluate the efficacy of sub-lethal doses of glyphosate (Round up R ), ammonia gas, phosphoric acid and sulfuric acid against Phelipanche aegyptiaca in potato. Results showed that sequential application of sub-lethal doses of glyphosate at all tested rates significantly reduced P. aegyptiaca shoot number and shoot dry weight. While, the use of ammonia gas, phosphoric acid and sulfuric acid had no significant effect on the total level of P. aegyptiaca infection as compared to the control. The best results considering both P. aegyptiaca control and selectivity in potato were obtained by sequential application of sub-lethal doses of glyphosate at 60 and 80 g·ai·ha −1 . Sequential application of glyphosate at 60 g·ai·ha −1 reduced P. aegyptiaca infection by 100% after 100 days after potato emergence (DAPE). Except for sequential application of glyphosate at 60 and 80 g·ai·ha −1 , all tested rates enhanced the maturity rate of potato plants and decreased the number of marketable potato tubers.

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Physical, chemical and environmental properties of selected chemical alternatives for the pre‐plant use of methyl bromide as soil fumigant

Cited by 115 publications

References 91 publications

Calcium-Activated Potassium Channels in Insect Pacemaker Neurons as Unexpected Target Site for the Novel Fumigant Dimethyl Disulfide

Calcium-Activated Potassium Channels in Insect Pacemaker Neurons as Unexpected Target Site for the Novel Fumigant Dimethyl Disulfide

The Effect of Two Types of Biochars on the Efficacy, Emission, Degradation, and Adsorption of the Fumigant Methyl Isothiocyanate

Phelipanche aegyptiaca Management with Glyphosate in Potato

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