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05
Aug
2013
Rice research verification program update
Author: Arkansas Row Crops

North Arkansas:  All RRVP fields have had midseason nitrogen applications and many are in the boot stage with one field beginning to head.  Grass control has been a chore this year, primarily due to timing issues, but suspected herbicide resistance may also have been a factor.  Cooler temperatures and rain have settled into the northern portion of the state.  Some sheath blight has been detected in fields, but only CL111 is being treated for the disease at this time.  Some fields with a history of smuts (false & kernel) are/will be getting a preventative treatment of propiconazole (6 oz/A Tilt or equivalent).   Significant rice stink bug populations have been noticeable in many of the northern RRVP fields for the past several weeks and will be evaluated at 50% heading.

South Arkansas:  The heat units have built up quickly with the hot July weather.  Fields are maturing and catching up fast.  Most rice is at late boot stage to 100% headed.  Sheath blight levels have been relatively low with only one field treated.  No blast or bacterial panicle blight has been detected.  Stink bugs on the other hand have been 3-4 times threshold levels.  Four out of eleven fields in the South Arkansas have had insecticide applications for stink bugs. Two more fields are pending waiting on 50% heading.  Late boot nitrogen applications have gone out on all hybrid fields.

County

Variety

Stage

General Rice Information & Applications

(Rates listed are per acre)

North Arkansas

 
Clay

RT CL XL745

2-3” IE

Due to delayed flood establishment (approx. 2 weeks) on the lower 8 acres of the field, it received an additional 100 lbs of urea to compensate for potential N loss.  Applied 5 oz/A Beyond prior to panicle initiation on 7/16 to control escaped red rice and amazon sprangletop.  Rice has tillered out very well and plant health looks good.  No disease incidence has been observed to date. The field will be evaluated for the boot N application next week.
Conway

RT XL753

Early Boot

Applied 15 oz/A Clincher + 1 qt/A of crop oil concentrate on 7/9 for amazon sprangletop and some barnyardgrass escapes.  Patches of volunteer rice have been observed in the field.  Rice stink bug observations have been high the last few weeks but appear to have reduced in number this week.
Independence

Roy J

Late Boot

Applied 100 lbs/A of urea during the panicle initiation stage (midseason) on 7/9.  Rice health and weed control appear to be good in the field.  Disease incidence has remained very low but a smut prevention application of 6 oz/A of Tilt or equivalent fungicide has been recommended due to the smut history of the field and a susceptible variety.
Jackson

Roy J

Mid Boot

Applied 100 lbs/A of urea during the panicle initiation stage (midseason) on 7/13.  The field experienced glyphosate drift during the tillering stage which delayed growth approximately 10 days, but had recovered prior to panicle initiation.  Weed control is good and sheath blight is below the threshold of 50% positive stops and primarily at the water line.
Lawrence

CL111

Late Boot

Applied 100 lbs/A of urea during the panicle initiation stage (midseason).  At the same timing, an application of 15 oz/A Clincher + 16 oz/A Facet L + 1 qt/A crop oil concentrate was applied for barnyardgrass surviving the Clearfield herbicide program on 7/15.  The barnyardgrass population will be screened for herbicide resistance.  Rice appears healthy, but sheath blight was well above 35% threshold last week and aggressive following the rains.  Recommended 21 oz/A Quilt Xcel for sheath blight control and kernel smut prevention.  The field should be headed later this week.
Poinsett

Jupiter

Late Boot

Applied 100 lbs/A of urea during the panicle initiation stage (midseason) on 7/3.  Rice health has remained good throughout the year.  Field-wide observations of sheath blight have been low with only a few positive stops in the lower portion of the field.  Facet-resistant baryardgrass was previously documented in the field and limited the options for control.  Delayed flood and aerial applications due to the weather added to the weed control limitations and patches of barnyardgrass were not controlled.  Expect rice to be heading later this week at which time rice stink bug evaluations will be made.  Low numbers observed at this time.
Prairie

Roy J

10% Headed

Rice health is good and flood levels have been well maintained.  No significant disease incidence has been noticed to date.  Field is beginning to head and rice stink bug sweeping will be performed at 50% heading.
Randolph

RT CL XL745

Late Boot

Applied 70 lbs/A urea at the late boot stage on 7/27.  Weed control is good except for a few patches of volunteer rice tolerant to Clearfield herbicides.  No significant disease incidence has been observed to date.  Heading is expected early next week.
White

Roy J

Late Boot

Applied 100 lbs/A urea at the panicle initiation stage (midseason) on 7/6.  Sheath blight has been observed in the field and has remained just above the water level and at this time treatment is not expected.  Due to a history of kernel smut in the field and a susceptible variety, an application of 6 oz/A Tilt (or equivalent) was recommended this week.
Yell

Roy J

0.75 inch IE

Applied 100 lbs/A urea on 7/27.  Plant health is good and significant disease incidence has not been observed.  Water levels were low and it was recommended to maintain an adequate flood.
South Arkansas

 
Arkansas 1

CL XL 745

Headed

High wind delayed herbicide application (approx. 3 weeks).  Clearpath went out 6/4 and control was less than expected with some barnyardgrass escapes.  Permit Plus (0.75 oz/A) was applied 6/29 for yellow nutsedge control.  Late Boot N application (70 lbs urea/A) went out 7/15.  Rice stink bug averaged 12 per 10 sweeps.  Karate Z at 1 gal to 70 acres applied 7/25.
Arkansas 2

Roy J

Early Heading

With Command and League herbicide activation early on, the field is clean with no grass or dayflower escapes.  50% positive stops for sheath blight on 7/19.  Quilt Xcel at 14 oz/A was applied 7/20.  Rice stink bug averaged 2 per 10 sweeps.
Arkansas 3

CL 151

Headed

This field is clean, uniform, and fully headed with approximately $45/acre total herbicide cost.  Rice stink bug running 18 per 10 sweeps on 7/24.  Karate Z was applied at 1 gal to 60 acres on 7/25.
Chicot 1

CL 152

Late-Boot

The N-STaR preflood fertilizer application went out 6/19.  The total recommended nitrogen rate was 95 units of N (200 lbs/A urea) No midseason fertilizer application was recommended.  The field is clean and uniform.  No signs of sheath blight or disease.
Chicot 2

Roy J

Mid boot to 75% Heading

The north end of the field is behind 2-3 weeks on maturity due to land forming work done earlier this year.  The south end is at 75% heading.  Rice stink bug running 12 per 10 sweeps.  The south end was sprayed with Karate Z at 1 gal to 70 acres on 7/29.
Clark

CL XL 745

Late Boot

The field was land formed earlier this year.  Chicken litter (2 tons/A) was applied 6/21 just prior to permanent flood.  Due to pump issues and lack of water the rice was stressed and tillering.  N-STaR recommendation of 250 lbs/A urea went out 6/23.  The field was flooded 6/25.  The field is coming along well and looks good.  Late boot fertilizer (70 lbs/A urea) was applied 7/29.  No disease problems have been observed.
Desha

CL XL 745

Late boot

Total N-STaR recommendation (230 lbs/A urea) was applied preflood on the east half on 6/18.  The west half received a split N rate: 160 lbs/A urea preflood followed by 70 lbs/A urea at late boot applied 7/25.  The field looks good overall.
Jefferson

Roy J

Late Boot

Applied Regiment (0.5 oz/A) for barnyardgrass on 6/3.  Control was poor on 1/4 of field with some barnyardgrass escapes.  Rice stink bugs are waiting on heading.  The flood is intermittent due to watering adjacent crops from the same irrigation well.
Lincoln

CL XL 745

Headed

Rice stink bugs are running 20 per 10 sweeps on 7/24.  Karate Z was applied at 1 gal to 70 acres on 7/25.  Overall, this field is clean and uniform.
Lee

Roy J

Early Heading

Sheath blight has been observed (20% positive stops) but not enough to warrant fungicide application.  Rice stink bugs are building but not headed enough for an insecticide application at this time.
Phillips

Roy J

Late Boot

Some barnyardgrass and amazon sprangletop have escaped in a strip in the middle of the field and around edges.  Rice stink bugs are building around the field in the grassy areas.  Will monitor for stink bug application next week.

 


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