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Posts Tagged ‘vermilion parish’

This year EPA approved a section 24C approval to use Dermacor X-100 in water-seeded rice in Louisiana. [Click here for a blog post about the registration.] Quite a few producers used this insecticide option in water-seeded rice in Louisiana this season. Mike Stout had extensive research data to support the efficacy of Dermacor in water-seeded rice, but I felt it would be good to verify the activity in commercial fields. Dr. Saichuk used this treatment option at the Vermilion Parish LSU AgCenter rice verification field. According to Johnny, the Dermacor rate was 1.75 oz/A. The variety Cheniere was planted on 4/5/2012 at 120 lbs/A. A true pinpoint flood was applied to the field. Nick Colligan and Stuart Gauthier pulled ten core samples from the field 4 weeks after permanent flood to verify the activity of the insecticide. Nick reported that they did not find any rice water weevil larvae in the core samples gathered.

On another note, one of the field reps reported that they are starting to see armyworms in vegetable gardens in Grand Chenier. I have not received reports of armyworms  in Louisiana rice yet, but it would be good to be on the lookout for this pest. If you treated with Dermacor X-100, the rice should be protected from injury, but CruiserMaxx or NipsitInside will not control army worms. Click here to read about armyworms in rice.

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Wow – 2012, yes, it’s right around the corner. I’ll bet you are asking the same question as me – where did 2011 go???

The rice winter meeting dates are now being announced. In this post I list all the dates I have received so far and over the next week I’ll send you more details on the specific programs. I will be speaking at all of these meetings – the topic will vary depending on the parish and the problems we observed last season. Please feel free to email me or your local county agent for more information on the meetings.

Meeting season will kick off with the Southwest Louisiana Rice and Soybean Forum in Welsh, LA on Jan 3, 2012. The Evangeline Parish rice and soybean meeting will be held the morning of Jan 4, 2012 in Ville Platte, LA. The next meeting will be the Acadia Parish Rice and Soybean school at the LSU AgCenter Acadia Parish office in Crowley. The week will wrap up with the Vermilion Rice School in Kaplan, LA on Jan 6, 2012. The Avoyelles Parish Rice meeting is scheduled for Jan 11, 2012 in Bunkie, LA. The final meeting I have on my calendar is the Northeast Louisiana Rice Forum in Rayville, LA on Jan. 26, 2012. On the evening prior to this meeting, the Louisiana rice growers association will hold their annual meeting in Crowley on Jan. 25, 2012. We will have the pleasure of receiving updates from USA Rice representatives.

For more information on the meetings I listed, please contact the following county agents:

Southwest Rice and Acadia Parish – Barrett Courville: bcourville@agcenter.lsu.edu

Evangeline Parish – Keith Fontenot: kfontenot@agcenter.lsu.edu

Vermilion Parish – Stuart Gauthier: sgauthier@agcenter.lsu.edu

Avoyelles Parish – Rob Ferguson: referguson@agcenter.lsu.edu

Northeast Louisiana – Keith Collins: kcollins@agcenter.lsu.edu

I hope to see you at one (or more) of the meetings this winter.

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I’ll be speaking at the Vermilion Rice Field Day on Tuesday, July 5, 2011. Here is the tentative agenda. I hope to see you at the field day. Also, as a reminder, the Rice Station field day will be held on Thursday, June 30, 2011.

First Stop—2:30p.m.

Soybean Group V Variety Trial

Buster Hardee Farm

North side of Hwy 14 and Meridian Line Rd intersection

Dr. Ronnie Levy

Soybean Specialist

Second Stop—3:00p.m.

Early Planting Date Water Weevil Survey

Hwy 14 and Hwy 711 intersection—north side of Rd

Edwin Miller Farm

Dr. Natalie Hummel

Rice Entomologist

Third Stop—3:15 p.m.

Field Damaged by Salt

Just past Hwy 711 and Burnell Rd intersection on East Side of Hwy.

Buster Hardee Farm

Dr. Johnny Saichuk

Rice Specialist

Drive-by

N-ST*R Test

Dwight Hardee Farm

North side of Burnell Road right Before Hardee Shop

Dr. Dustin Harrell

Rice Agronomist

Drive-by

Early Soybean Planting Date Study

Dwight Hardee Farm

Dr. Ronnie Levy

Soybean Specialist

Fourth Stop—3:45 p.m.

N-ST*R Test

North on Hwy 91 then west on Zaunbrecher Rd.  Field is on South Side of the Highway

John and Matthew Zaunbrecher Farm

Dr. Dustin Harrell

Rice Agronomist

Fifth Stop—4:30 p.m.

Rice Disease, Variety, & Agronomy Research Plots

Lounsberry Farm

¼ mile before the Lake Arthur Bridge off of Hwy 14

Dr. Don Groth—Rice Pathologist

Dr. Steve Linscombe—Rice Breeder

Dr. Sha Xueyan—Rice Breeder

Final Stop—5:00 p.m.

Lounsberry Shop

Rice Economic Update & Meal

Dr. Mike Salassi or Dr. Kurt Guidry

Rice Economists

For more information please contact:

Stuart J. Gauthier

County Agent

Vermilion Parish

1105 West Port

Abbeville, LA 70510

337-898-4335

337-349-6446

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It’s funny how when you work a field crop, life eventually moves in a pretty predictable cycle. Well, it’s that time of year again. Time to start scouting for rice stink bugs in headed rice, although it does seem to be coming a little bit earlier than usual. This is probably a result of very early planting of rice in some parts of south Louisiana. Unfortunately, field conditions are favoring a bad year for stink bugs. The drought conditions have killed off grasses that would normally serve as a host/reservoir for stink bugs, so there is a chance they will move more readily into heading rice. Recent reports from Arkansas and Mississippi indicate that large populations of rice stink bugs are present in the mid-south. We are already finding them in headed rice fields at the rice research station in Crowley, La.

Last Friday, Johnny Saichuk and I scouted a variety trial in Vermilion Parish where the CL111 was heading first and was already infested with rice stink bugs.

Rice stinkbugs are light tan in color with points on the corners of the pronotum.

I received a call about the field because they noticed quite a bit of blanking in the panicles. They also found a high population of grasshoppers and suspected they may have been causing injury.

Longhorned grasshopper adult in heading rice. You can tell it is an adult because of the wings.

When we assessed the situation, Johnny determined that the blanking was most likely physiological, some sort of effect of weather conditions when the rice was at panicle development (pd). You can read more about it in his field notes. If you don’t receive Johnny Saichuk’s Field Notes via e-mail, please send Johnny an e-mail to be added to his list: jsaichuk@agcenter.lsu.edu. As we examined the grasshopper situation, we found that the grasshoppers were long-horned grasshoppers, which are typically predators. We would not recommend treating for grasshoppers unless they are causing excessive defoliation. Click here to read more about long-horned grasshoppers in rice. Odds are that they were attracted by the rice stink bugs, which we did find to be abundant in the field. We advised holding off on an insecticide application until the rice reached 50% heading. It is very tempting to put out a pyrethroid with the fungicide application at early-heading, but research has shown that this is too early to prevent injury. Putting out an early application will probably just add to the number of times you need to spray the field, while not providing any additional protection. To learn more about rice stink bug management click here.

We have a graduate student, Bryce Blackman, who is currently studying rice stink bugs for his dissertation research. One aspect of his work is to re-evaluate treatment thresholds. At the moment, we continue to use the standard recommendations. To scout for rice stink bugs in the field, use a 15-inch diameter sweep net, take 10 sweeps at 10 different areas around each field. Count the number of bugs collected after every 10 sweeps. In the first two weeks of heading, treat fields when there are 30 or more bugs per 100 sweeps. Pesticides that can be used include malathion, methyl parathion and a variety of pyrethroids including Declare, Karate Z, Mustang Max, Prolex and a number of generics. From the dough stage until two weeks before harvest, treat fields when there are 100 bugs per 100 sweeps. When approaching two weeks before harvest, you can treat with any of the chemicals listed above with the exception of Karate Z and Prolex, which have 21 day pre-harvest intervals. You can learn more about rice stink bug biology by clicking here.

Resistance to pyrethroids has been increasing in Texas, and there is a chance that we could have some issues with resistance developing in Louisiana also. If you have a field where you are finding it particularly difficult to control the rice stink bugs with your traditional control strategies, please contact me so we can sample the insect population. If you have further questions about rice stink bug management, please contact your local County Agent.

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I know that quite a few of the rice consultants in Louisiana now have iPads that they are carrying around with them in the field. The utility of this tool can be enhanced by downloading apps for a number of uses. AgCenter faculty are currently developing a mobile tool called “RiceScout” that should speed up the process of rice in-field diagnostics.

The LSU AgCenter Southeastern Region Director, Dr. Bobby Fletcher, recently sent me a link to an iPhone app search tool. This tool was developed by the University of Arkansas as an aid in the search for agriculturally related apps. You can find a link to the tool here: http://www.uaex.edu/news/april2011/0408AppSearch.htm If you try out this tool, please let me know if it is useful.

Stuart Gauthier, LSU AgCenter County Agent in Vermilion Parish, recently announced a Vermilion Rice Growers meeting and verification field tour with Dr. Johnny Saichuk. I plan to talk about rice insect management and address any questions from producers. All are welcome to attend. Please contact Stuart at sgauthier@agcenter.lsu.edu if you plan to attend the meeting.  The group will gather at Suire’s Grocery Store (13923 La Highway 35, Kaplan, LA 70548) at 7 am on Tuesday, April 26, 2011. Following a brief Vermilion Rice Growers Meeting, we will travel to Josh Newman’s Verification field (departing around 8 am). 

Hope to see you at the meeting.

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I received the following announcement from Vermilion Parish County Agent Stuart Gauthier today.  I hope to see many of you at the meeting.

The 39th annual Vermilion Parish Rice School will be held on Friday January 7, 2011 at the American Legion Hall in Kaplan, LA.  Registration begins at 7:30 a.m. with the educational portion beginning at 8:00 a.m.  Anyone interested in rice farming is invited to attend this free training. 

The agenda for the meeting is as follows:

7:30 a.m. – Registration/ Coffee and Donuts 

8:00 a.m. – A General Guide for Using Salt Water on Rice – Stuart Gauthier, County Agent, LSU AgCenter 

8:20 a.m. – Rice Variety Update – Dr. Steve Linscombe, Regional Director & Dr. Xueyan Sha;  Rice Breeder, Rice Station, LSU AgCenter 

8:50 a.m. – Cultural Considerations When Drilling Rice & Other Production Practices – Dr. Johnny Saichuk, Rice Specialist, LSU AgCenter  

9:10 a.m. – Rice Fertility –Reducing Nitrogen recommendation for CL 151– Dr. Dustin Harrell, Agronomist- Rice Research Station 

9:30 a.m.– Rice Outlook –  Kurt Guidry,  Department of Ag Economics, LSU AgCenter 

10:00 a.m. – 10:15 Break 

10:15 a.m. – Rice Water Weevil Demonstration Test, 2010 Results – Dr. Natalie Hummel, Entomology Professor, LSU AgCenter 

10:40 a.m. – Panicle Blight & Fungicide update – Dr. Don Groth, Rice Pathologist, Rice Research Station, LSU AgCenter 

11:10 a.m. – Rice Weed Control Update- Neely Sprangletop, Strategies for dealing with Volunteer Hybrid & Resistance Red Rice Issues – Dr. Eric Webster, Weed Science Professor, LSU AgCenter 

11:40 a.m.  Rice Marketing Update for Vermilion Parish – Eddie Gaspard, Planters’ Rice Mill 

11:55 a.m. – FSA Comments & Grace – Larry Thibodeaux, CED, Abbeville

Also mark your calendars for the Vermilion Soybean School scheduled for Wednesday, Jan. 19, 2011 from 11:30 to 3:00pm at Vermilion Extension Office.

For more information, please contact:

Stuart J. Gauthier

County Agent

Vermilion Parish

1105 West Port

Abbeville, LA 70510

337-898-4335

337-349-6446

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UPDATE: I didn’t get any guesses about the mowing injury, well here’s the answer – it was caused by (drumroll please) Cows!  They had escaped from some nearby pasture and enjoyed munching on the edge of the rice field. 

Today we learned a good lesson about verifying the cause of crop damage.  Fred Cramer (G&H in Gueydan) had called me about whiteheads in rice.  Tiffany and I drove out to Gueydan early to beat the heat.  We met with Toby McCown and Fred at the G&H store.  We suspected that the whitehead damage was being caused by borers.  When we struck out across the Dermacor X-100 treated field we found a few whiteheads.  As we began to inspect the damaged plants, the symptoms just didn’t look like borer injury.   

Whiteheads in rice - at first we thought these would be caused by borers, but we found that was not the cause.

 

Feeding injury most likely caused by the rice field rat.

 

Rat chewing injury near a node - this resulted in whiteheads.

 

Whitehead that was most likely caused by rat feeding injury.

 

The edges of the damaged area were clean, there was no feeding lesion in the sheath or frass (insect waste), and we did not find any insects except for a few chinch bugs.  It seemed like something had chewed on the rice.  My instinct was to attribute the damage to either an animal or a chewing insect (maybe grasshoppers).  I could not confirm what had caused this damage while I was in the field.  After we wrapped up for the day, I stopped by the rice station in Crowley and showed the pictures to Johnny Saichuk – he told me the damage was probably caused by the rice field rat.  He had seen this damage about 5 years ago in Acadia Parish.  Apparently it is a fairly common problem in some parts of Texas.   

Whiteheads and some cropped rice - any guesses about what mowed the rice?

 

We continued up the road to a nearby untreated field.  Along the way, Fred pointed out a cluster of whiteheads on the edge of a field.  In addition to the whiteheads, quite a bit of the rice had been clipped.  Any idea what caused this damage?  First clue is that it was not an insect, but something else that likes grass.   

The untreated field (no insecticide seed treatment) we scouted next had just started to head.  We were able to locate a few whiteheads, and upon closer inspection found some borers injuring the rice plants.  The rice is heading unevenly, and so this makes pest management more difficult – especially the timing of sprays for rice stinkbugs and borers.   

In one plant that had a whitehead we found a feeding lesion on the leaf sheath, and under that a tiny sugarcane borer larvae.  When I cut into the stem I was surprised to find about 10 more larvae.  It’s rare to find this many borers in a single stem.  It was also discouraging because they were tiny larvae that had already bored into the stem.  An insecticide application will not control the borers once they enter the stem.  About 15% of the rice was fully headed and the rest was around split boot.  We found more borers in a few other plants, and so decided that a pyrethroid spray would be wise to attempt to prevent more whitehead injury from the borer infestation.  The farmer plans to apply 2.0 oz of Karate per acre.  Hopefully this will prevent further borer injury and control the early stink bug infestation.   

First or second instar sugarcane borer that we located behind a damaged sheath. When I cut open the stem there was a surprise...

 

I found about 10 sugarcane borer larvae had already bored inside the stem. Pyrethroid sprays will not control borers that have entered the stem.

 

In this picture you can see just how tiny these borer larvae were - they were just about 1/4 inch long and had already bored into the stem.

 

So where did the borers come from?  A neighboring field of tall weedy grass had been plowed under recently, and it is possible that the borers had moved out of that neighboring field into the rice.  

Rice Stalk borer on the tip of my finger - this larva was also small in size and had bored into the stalk. You can identify rice stalk borers by the dark head in combination with a pair of continuous stripes running the length of the body.

 

We found some classic examples of frass bring pushed out of the stalk.  

Frass forced out of the stem due to sugarcane borer feeding inside the stalk.

 

 When  I pulled back the leaf sheath, the exit hole was apparent.  

Sugarcane borer emergence hole and frass.

 

 We also found some rice stinkbugs on the heading rice that was starting to bloom.   

Rice stink bug on flowering rice - these seed suckers attack rice as soon as they can.

 

This field is also maturing unevenly, and late-season insect management will be a challenge.  Remember that in most cases once you see the injury caused by borers (whiteheads) it is too late to treat.  In this case the crop is maturing unevenly, so a treatment may still do some good.  It is best to scout for borers when you are scouting for sheath blight injury.  In Texas, the first pyrethroid application for borers is recommended from 1 to 2 inch panicle, followed by a second application at boot.   

The final field we scouted had been treated by CruiserMaxx.  This seed treatment will not control borers, and we did find a few whiteheads in this field as well.  In this case we had a combination of sugarcane borers and rice stalk borers infesting the rice.  The field had already been drained in preparation for harvest, and so a borer treatment is not advised.  The infestation of borers was very light.  

Mike Stout and I are co-advising a graduate student who is focusing her studies on borers.  We hope to know more about borer management, thresholds, insecticide control options, and variety susceptibility in the next couple of years.

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