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Delta Farm Press
by Jarrod Hardke, Rice Extension Agronomist - April 14, 2023
“Seems I’ve got to have a change of scene.”
Well that certainly took a dramatic turn. The weather over this week has been ideal
for most across the state. Some have been in the have not category where more rain
was received last week and just drying out, but the majority have had their foot on
Those with better fall weather for ground preparation are out in front on planting
progress as expected. Those unable to get ahead in the fall have been going double
time this week working ground and moving into planting.
Given how warm and breezy this week has been, it shouldn’t come as a shock that areas
with the most progress are now actually in need of rain. The perfect storm in spring
planting season is to get a small rain each week so we can get planting in rapidly
while maintaining good soil moisture to hopefully avoid the dreaded flush.
The forecast rain on Saturday will be the first welcome rainfall event of the year
for many, and it has some worried about upcoming progress if we miss it. The reality
is there are fields out there with rice trying to emerge that need a rain or will
need to be flushed, even though it’s mid-April… What a difference a year makes.
Let us know if we can help.
Fig. 1. NOAA 7-day precipitation forecast.
We were estimated to be at 12% planted to start the week, but I’ll be surprised if
progress hasn’t reached 30-40% in the upcoming report on Monday. The number could
be even higher than that but there is also still a lot of corn and early soybean planting
going on at the same time.
Table 1. U.S. Rice Planting Progress as of April 9, 2023 (USDA-NASS).
Fig. 2. 2012-2023 Arkansas rice planting progress by week (USDA-NASS).
While we haven’t officially gotten a call yet on armyworms in rice, we are getting
several about them in wheat. For the most part the numbers observed in wheat have
been low. We wanted to make everyone aware that there are a few armyworms around,
and that you may see them in rice in the coming weeks. Fields next to wheat will
be the most susceptible.
As far as recommendations go, we generally don’t recommend treating small rice for
defoliation. We have done several years of work on this, and just do not see a yield
loss from defoliation occurring prior to tillering (Fig. 3). In a lot of cases, we see a minor yield increase. With that said, there are always
exceptions to thresholds. If armyworms can feed on the growing point due to soil
cracking, then an application should be considered. This typically will only occur
on heavy clay soils.
For insecticide options, if you are in a situation where you need to spray, we would
suggest sticking to lambda-cyhalothrin products (Warrior II, Lambda-Cy, etc.). Everyone
may remember the control issues from 2021, but those were fall armyworms. What we
are currently seeing are true armyworms, where we would still expect to achieve 90%
or greater control with lambda. If you have Dermacor or Fortenza as a seed treatment,
then they should protect the rice with no issues.
Fig. 3. Yield compared to the untreated control for multiple defoliation levels and
growth stages for April planted rice.
The DD50 Rice Management Program is live and ready for fields to be enrolled for the
2023 season. All log-in and producer information has been retained from the 2022
season, so if you used the program last year you can log in just as you did last year.
Log in and enroll fields here: https://dd50.uada.edu.
The Arkansas Rice Advisor site https://riceadvisor.uada.edu functions like an app on your mobile device. There you can readily access the DD50
program, rice seeding rate calculator, drill calibration, fertilizer and N rate calculators,
publications, and more.
Arkansas Rice Updates are published periodically to provide timely information and
recommendations for rice production in Arkansas. If you would like to be added to
this email list, please send your request to firstname.lastname@example.org.
This information will also be posted to the Arkansas Row Crops blog (http://www.arkansas-crops.com/) where additional information from Extension specialists can be found.
More information on rice production, including access to all publications and reports,
can be found at http://www.uaex.uada.edu/rice.
We sincerely appreciate the support for this publication provided by the rice farmers
of Arkansas and administered by the Arkansas Rice Research and Promotion Board.
The authors greatly appreciate the feedback and contributions of all growers, county
agents, consultants, and rice industry stakeholders.
Rice Extension Agronomist
Extension Weed Scientist
Rice Verification Coordinator
Extension Rice Pathologist
Extension Soil Fertility