Alvin, Texas
July 28, 2004
Mother Nature
created ideal conditions for plant diseases to thrive this
summer, plaguing rice in coastal Texas and Louisiana and across
the Midsouth, but hybrids have held their ground.
“This year has
had the most disease potential of any year since I have been
back in Arkansas, which is about 12 years,” says Dr. Rick
Cartwright, rice pathologist for the
University of Arkansas
Cooperative Extension Service.
One of the
wettest Junes on record was ushered in by heavy rains in late
May. The southeast and central parts of the state received
deluge after deluge of rain, and conditions were hot and humid.
Rainfall, heat and humidity continued into July for much of
northeastern
Arkansas.
The result has been ideal conditions for the two most deadly
diseases for Midsouth rice crops: sheath blight and leaf blast.
The University
of Arkansas estimates 800,000 to 1 million acres of rice will be
treated for diseases this summer. Cartwright says up to 400,000
acres of rice has been identified as having leaf blast symptoms,
and at least 600,000 to 700,000 acres will be treated with
fungicides for sheath blight control.
“Part of the
problem is that a lot of the varieties we plant are somewhat
susceptible to blast,” Cartwright explains. “Our most popular
cultivar is Wells, a variety that is somewhat susceptible to
blast. Clearfield 161 was planted on a lot of acres in Arkansas
this year as well, and it is somewhat susceptible to blast and
very susceptible to sheath blight.”
Even in a year
of such heavy disease pressure, the vast majority of acres
planted with RiceTec hybrid rice did not require costly
fungicide applications.
“In our
experience, the hybrid rice, if managed according to
RiceTec’s guidelines for
management, does not get much disease pressure,” says
Cartwright.
The common
races of blast found in the United States should not be a
problem in any of the commercial hybrids from RiceTec, says Van
McNeely, technical services manager for RiceTec. McNeely is
based in Jonesboro, Ark., and says there have been no reports of
blast on any of the RiceTec hybrids this year in Missouri,
Arkansas, Mississippi and northeast Louisiana.
“We have had
some Clearfield® XL8 sprayed for sheath blight, but a
very small percentage compared to the rice varieties, which have
been pounded by both leaf blast and sheath blight,” he says.
RiceTec
hybrids have excellent disease ratings from researchers at the
major universities. The three primary RiceTec hybrids available
for planting - Clearfield XL8, XP710 and XP712 - have the best
available overall disease package, and in most cases, should not
require a fungicide application.
XP710 has
demonstrated an even better tolerance for sheath blight than
Clearfield XL8, says McNeely.
“Our rating
and university ratings on sheath blight for XP710 are far better
than anything else on the market,” he says. “The tolerance to
major rice diseases our hybrids offer can be a major
risk-management tool for producers.”
South of
Kaplan,
Louisiana, planting rice near the
Intracoastal
Waterway means dealing with heavy disease pressure most every
year. Ernest Girouard says very seldom does a year go by that he
does not have to make at least one fungicide application on his
rice. For the past two years, he has been growing hybrids in
side-by-side strip trials with the conventional varieties he
normally plants.
“This year,
which was a worse disease year than most, I did not have to
spray the hybrids,” he says. “Our main pressure is from sheath
blight, and we find that the disease not only affects yield, but
it also affects milling and the ratoon crop. In our trials with
RiceTec, we have not applied fungicides on the hybrids, and the
yields and milling were better than my conventional rice.”
All of
Girouard’s conventional rice had a fungicide application this
summer. Although a small number of individual hybrid plants
appeared to have sheath blight symptoms, the disease did not
seem to affect the overall strip trial, so no hybrids were
sprayed, he says.
“In spite of
having a little disease pressure, the hybrids still yield and
mill much better than my conventional varieties,” says Girouard.
“There can be disease all around it in the fields, and in some
cases, disease actually on some hybrid plants, but we still get
excellent yields. I am very interested in what I am seeing with
the hybrids from RiceTec.”
Like the
Midsouth, coastal Louisiana and Texas experienced similar wet,
humid conditions ideal for rice diseases, says Mark Spilman,
technical services representative for Texas and south Louisiana
at RiceTec.
“This has
not been a favorable year for rice production due to disease
pressure,” Spilman says. “A lot of the rice was sprayed at least
once for sheath blight, but generally speaking, very few of the
hybrids required a fungicide application, and disease pressure
has been significantly worse in coastal Louisiana and Texas this
year.”
RiceTec, Inc. is an integrated rice company specializing in the
breeding, development and marketing of high-value rice products.
Headquartered in Alvin, Texas, the company operates the primary
research center of RiceTec AG, an international rice technology
venture. RiceTec, Inc. is the first company to commercialize
hybrid rice seed in the United States. It is also a leading
producer and marketer of specialty rice products, which are sold
under RiceSelect brands in more than 20,000 supermarkets
throughout North America.
Clearfield is a registered trademark used under license from
BASF. |