Scientist Searches For Controls For Weeds In Rice
LSU AgCenter weed scientist Eric Webster continued
his work in 2013 on dormant hybrids and red rice outcrossing
by starting a new project using several different herbicides to
eliminate undesired plants in a field.
rice plants, I believe, are more efficient than normal red rice at
competing for nutrients, light and space," Webster said.
included dividing a weed-infested field in three sections and
planting one in soybeans and another in Clearfield rice and leaving
the third fallow.
of the field were treated with various herbicides, including glyphosate, Zidua,
Outlook and Newpath.
make our final counts and see how well we did in year four,"
started on a new aquatic weed herbicide, benzobicyclon,
from Gowan that shows good activity on ducksalad and cattail, Webster said. "It
looks like it's going to have activity on sprangletop."
is becoming more of a problem for rice farmers, so he started a
greenhouse project to study what can be done to control the weed.
work has been expanded to include north Louisiana. He said although
much of his research there duplicates what he is doing in south
Louisiana, he's also been examining 16 herbicides in four tests to
best determine the optimum time to apply herbicides that control
broadleaf and sedge weeds.
The use of
Permit for late-season or salvage control of sesbania,
jointvetch and nutsedge
is working well, he said, but he advises avoiding Permit Plus on
those plants because it appears the herbicide tends to delay rice
the use of Command, post-emergence, plus a crop oil concentrate is
showing good results on small grasses and jointvetch.
He also is
evaluating the herbicide Sharpen for control of small grasses,
broadleaf weeds and rice flatsedge. It has
excellent activity on sesbania and jointvetch, he said.
works well at the 1-ounce rate, but 2 ounces per acre can be very
injurious to rice and in some cases reduce stands if it is applied
during cool, wet conditions.
he has been working on burndown weed
control chemicals, including Yukon, a mixture of Permit and dicamba.
He also is
continuing a research project at the LSU AgCenter
Rice Research Station South Farm to determine the distance that jointvetch and hemp sesbania
weeds compete with neighboring rice plants.
checkoff money paid by farmers and
allocated by the Louisiana Rice Research Board has been invaluable to
"LSU AgCenter research on the new BASF herbicide Provisia that will be used with a new
herbicide-resistant rice to complement Clearfield would not have been
possible without checkoff funding,"
herbicide research is inherently expensive and requires thousands of
hours of work every year," he added. "Without the funding,
we couldn't have accomplished what we have, and that would mean the
results that benefitted farmers would either be delayed or would not
have been possible."