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Delta Farm Press
by Jarrod Hardke, Rice Extension Agronomist - July 14, 2023
“I howled at the morning drivin’ rain, but it’s alright now, in fact it’s a gas.”
Nick Bateman, Ben Thrash, and Glenn Studebaker
Endigo ZCX Section 18 Label and Documentation
Rice stink bug numbers and control with lambda has varied greatly since 2020 depending
on where you are in the state. In our assays work with lambda, we have rarely exceeded
65% control with a 1X rate, and no benefit has been observed for going above 1X.
With the limited amount of alternative products available, we applied for a section
18 for Endigo ZCX in April, and finally got the approval today July 14th. Many folks are already familiar with Endigo ZCX due to the section 18 for Endigo
ZC the past two summers. Our experience with this product has been good, and we typically
see upwards of 14 days of control. Below are list of highlights around the section
18 and Endigo ZCX. If there are any questions please feel free to reach out and contact
Endigo ZCX Highlights:
Approved from July 14th through October 15th
Rate range is 4.5-6 oz (we prefer 5oz)
Limited to one application per year
Maximum of 6.0 fl oz/year
Pre-Harvest Interval is 21 days
Area within 100 feet of the edge of the field must be kept free of flowering weeds
A surprisingly rainy, muggy, damp week has given mid-July a strange feel. Given the
conditions, sheath blight has really taken off (more on that below). A good portion
of rice in the state is now heading to some degree and that should speed right along
over the next two weeks.
We’re expected to heat up this week, and several days of warmer, drier, direct sunlight
days should be very good for rice progress. It will also hopefully slow down some
of the disease progress.
The nights are going to get warm during this period, but the expectation is that temps
day and night will drop back off some by next weekend. There are also some reports
that we could see some haze from wildfire smoke coming from Canada. That’s not ideal
this time of year, but arguably better than it occurring around joint movement.
There’s plenty in this update on rice stink bug – see the two articles and the podcast
Get out there and scout for stink bugs and sheath blight!
Let us know if we can help.
Fig. 1. NOAA 7-day precipitation forecast.
Ento Update 7-14-23: Endigo ZCX Section 18 Exemption
Entomology Update 7-13-23: Rice Stink Bugs, Plant Bugs, Bollworms
Weeds AR Wild Series, S3 Ep15: Brake Herbicide Use in Rice
Camila Nicolli and Jarrod Hardke
The weather continues to be extremely conducive for sheath blight development and
progression. Continue actively scouting for this disease. Scout the field in a zigzag
pattern, parting the canopy to evaluate a 3-foot section at each stop.
For cultivars rated Susceptible (S) or Very Susceptible (VS) we need to start being
concerned when we exceed 33% positive stops. For cultivars rated Moderately Susceptible
(MS) we need to start being concerned when we exceed 50% positive stops. But just
because you reach the positive stops threshold does not mean you need to treat then.
See Fig. 2. for a decision-making checklist for sheath blight. It includes 1) susceptibility
of the cultivar, 2) percent positive stops for sheath blight, 3) health of the upper
3 leaves in canopy, and 4) nitrogen rate and seeding rate used.
Link: Fungicides and Mix Rates for the Major Rice Diseases
Fig. 2. Decision-making checklist for fungicide applications to manage sheath blight.
Table 1. Mode of action group, active ingredient, and disease activity of rice fungicides.
Demethylation Inhibitors (DMI)
Nick Bateman and Ben Thrash
Phone calls have picked up rapidly over the past 7 days on rice stink bug. Reports
are still varying, with most populations still being somewhat moderate. With that
being said, we have received multiple calls on populations exceeding 70-80 on 10 sweeps.
As more rice heads over the following week these densities should dilute some.
We are still hearing about and getting some questions on adding lambda to a fungicide
application. This is a waste of money (Fig. 3)! Adding an insecticide, particularly a pyrethroid at this time, is opening the door
to make rice stink bug populations higher. This application will kill beneficials
and, if your application timing is correct for smuts, heads should not be out therefore
will receive no protection. The minimal amount of rice stink bugs killed with this
application will not offset the potential issues down the road that this can cause.
So, what are our current options for rice stink bug control? Some folks have been
using lambda with mixed but generally ok results in low populations. Tenchu and Endigo
ZCX have been effective on the higher populations that have been observed. We had/have
a limited supply of Tenchu in the state and it is rapidly running out. As mentioned
earlier in the update, Endigo ZCX received a Section 18 for use in rice effective
today. A big thanks to the Arkansas Department of Agriculture and the EPA for working
with us on this urgent need.
Fig. 3. Impact of applying a pyrethroid prior to rice heading on rice stink bug populations.
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