The alkynes 3 were obtained by the reactions of 1 with propargyl bromide
in alkaline medium.
Atmospheric volatilization of methyl bromide, 1,3-dichloropropene, and propargyl bromide
through two plastic films: Transfer coefficient and temperature effect.
The treatments-1,3-dichforopropene + chloropicrin (578 kg/ha shank injected), iodomethane + chloropicrin (515 kg/ha shank injected or 448 kg/ha drip applied) and propargyl bromide (221 kg/ha shank injected or 207 kg/ha drip applied)--controlled root-knot and citrus nematodes equal to methyl bromide (507 kg/ha shank injected) during an eight-year evaluation period.
Application of propargyl bromide and replanting with Merlot on 1103P was the only fumigant-rootstock combination that resulted in grape yield similar to the standard methyl bromide treatment.
Propargyl bromide is among the chemicals that might be used in place of methyl bromide.
Even though propargyl bromide is not new," says ARS agricultural engineer Thomas J.
Trout, who leads the ARS Water Management Research Unit at Fresno, California, is coordinator of a cluster of USDA-funded propargyl bromide studies, including university investigations into its use as a preplant fumigant for floral crops.
Results from tests they conducted in 2000 suggest that propargyl bromide or another contender, iodomethane, does as good a job--or nearly so--as methyl bromide plus chloropicrin in quelling some of a flower's worst soil-dwelling enemies.
The EPA lists propargyl bromide
and sodium azide as alternatives under development, but these are not yet registered for use in forest nurseries.
To bolster ARS and university research on this compound, USDA recently allocated $800,000 specifically for propargyl bromide
We've also seen very promising results with a chemical called propargyl bromide," says Ajwa.
Those figures may be particularly valuable if the manufacturers of candidate compounds, such as methyl iodide or propargyl bromide, seek U.