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Delta Farm Press
by Jarrod Hardke, Rice Extension Agronomist - June 3, 2022
“Fire on the mountain, lightning in the air, gold in them hills, and it’s waitin’
for me there.”
Well, the southern half or more of the state got more rain than they bargained for
this week. I think we were all expecting around a half inch of rain, but the south
got more like 1-2 inches and the north got more like a quarter inch, so I guess on
average we got what we expected.
Perhaps not as much rice has gone to flood as would be expected at this point, but
these routine rainfall events are making it difficult to push the crop along. In
an effort to make something happen, a number of folks were caught by pop-up showers
in the middle of trying to fertilize. We can clean up and save most of those situations,
but they do make a difficult year more aggravating.
Conditions remain fairly mild so rice isn’t progressing too fast, but we are going
to start getting behind. Now is a great time to run a DD50 report (https://DD50.uada.edu) to see where you are in terms of rice progress, particularly as it relates to preflood
nitrogen timing. Growers and consultants can enter their own fields, or you can contact
your county Extension office and they can assist you. Given our fertilizer costs
this year, we want to strive to get urea out efficiently on dry ground, but if this
wet pattern continues we’ll need to start pushing the envelope a little to fertilizing
where it’s “dry enough”.
With the routine rain and high winds we’re also seeing an uptick now in mistakes regarding
herbicide applications and injury to adjacent fields as everyone tries to push to
get things done. Let’s do our best to avoid self-inflicted damage.
Next week looks very unsettled with a string of 30-50% rain chances depending on where
you are. It will be time to think about overlapping residual herbicides again for
activation to hold us until we can fertilize and flood.
Let us know if we can help.
Fig. 1. NOAA 7-day precipitation forecast.
RREC Rice Field Day
On Friday, August 5, 2022, the Rice Research & Extension Center near Stuttgart will
host its live, in-person, Rice Field Day! More details to come, but it will follow
a traditional format of morning field tours followed by lunch.
Nick Bateman and Ben Thrash
As we start getting rice to flood, we will begin to attract rice water weevils (RWW).
Our RWW plots in Stuttgart went to flood this week, and RWW activity has been extremely
low. Generally, at the Stuttgart location RWW pressure is low to moderate in most
years. Looking at these plots this week; RWW scarring is starting to show up but
not at an alarming level. We have also observed this for multiple fields around RREC
that we have been monitoring for the past few weeks. It is still early to make a
prediction on how bad RWW will be this year, but in the past several years we have
noticed that the RWW pressure has initially been light when flooded before June 1st and picks up considerably after.
While this scarring from adult weevil feeding is usually superficial and doesn’t cause
yield loss, this is a sign that adults are present and active in the field. Unfortunately,
with the weather conditions we have had, planting has been delayed along with flood
timing. Based on planting date studies, we have observed much higher RWW pressure
in rice planted in or after mid-May.
The bulk of rice planted in Arkansas is either treated with NipsIt or CruiserMaxx
seed treatment, which are excellent on grape colaspis. However, efficacy of these
products on RWW decreases 28-35 days after planting. Although RWW pressure is higher
for later planted rice, these plantings typically experience rapid growth allowing
us to flood within 3 weeks of planting. In these situations, we still get sufficient
control of RWW with NipsIt or CruiserMaxx. If rice has been treated with Dermacor
or Fortenza, it will still have protection from RWW at least 60 days after planting.
Also, it is important to note that NipsIt and Cruiser within the 28-35 days after
planting will reduce scarring observed. However, Dermacor and Fortenza will not affect
scarring but will maintain better control of larvae.
For rice that is going to flood past the 28-35 day window with CruiserMaxx Rice or
NipsIt, a foliar application of a pyrethroid like Mustang Max, Lambda-Cy, or Declare
might be called for. However, Dermacor and Fortenza will NOT need a foliar application.
Timing is critical on foliar applications for rice water weevil. Applications must
be made within 5-7 days of permanent flood establishment, as long as adults are present. If it is later than that, our studies indicate you may as well keep the insecticide
in the jug. Your only option then is to drain the field until the soil cracks to
prevent weevil damage. Most growers aren’t crazy about doing that as it is costly
and may impact weed control and fertility. Remember, late rice will have high populations
of RWW and staying vigilant with scouting and timely applications will be critical.
Fig. 2. Rice water weevil adult feeding on rice.
Fig. 3. Leaf scarring from rice water weevil adult feeding.
The DD50 Rice Management Program is live and ready for fields to be enrolled for the
2022 season. All log-in and producer information has been retained from the 2021
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 Soil Fertility
Extension Rice Pathologist