Archive for June, 2010

The southwest rice tour stop at Mark Pousson's farm in Welsh, La. (Photo by T. Pasco)


UPDATE: Additional information about the field day (including an online presentation of the field tour and speaker session) is available at www.lsuagcenter.com/ricefielddayinfo. 

The forecast calls for a chance of rain in the Crowley area tomorrow morning. In the case of rain, all field day activities will be held in the poster pavilion/drier area. Field tour speakers will make their presentations inside the drier beginning at 8:30 a.m. All other activities will be as scheduled. 

This is a busy time of year for field meetings.  Field days and workshops are a great opportunity to see research and extension programs conducted both at the research stations and on cooperator farms.  I hope to see many of you at these upcoming events.  

June 30.  Hundley Master Farmer Field Day/Ricetec Field Day, Mowata La., 5:00 PM.   

This field day will report the results of a small plot evaluation conducted by RiceTec.  This location evaluated varieties and also included a rice water weevil insecticide rate test.  My weevil crew gathered samples from the small plots 4 weeks post flood.  The results of the test will be presented.   Attendance at this field day will also count as Phase II and Continuing Education for producers wanting to get credit in the Master Farmer Program.  

For more information, please contact Cullen Minter at 336-499-6489.   

July 1.  101st Annual Rice Research Station Field Day.  Rice Reseach Station, Crowley, La. Beginning at 7:30 am.   

The LSU AgCenter Rice Research Station Rice Field Day will be held on Thursday, July 1, 2010 at the station.  The activities will begin at 7:30 a.m. with field tours of research projects, with the last tour truck leaving no later than 9:15 a.m.  Mike Stout and I will give an update on the Entomology Research and Extension Programs.  

There will be a poster session under the equipment shed on the west side of the drier. The poster session will last from 7:30 to 10:30.  During this time researchers and Extension specialists will be discussing and explaining their research programs, the methods used and the results they have attained thus far.    

Much of the field day program will focus on historical aspects of rice production technology developed through the years at the research facility. The main program will start at 10:45 a.m. in the drier facility with a lunch following.  

For more information, please contact Dr. Linscombe at slinscombe@agcenter.lsu.edu or 337/788-7531   

July 6.  Vermilion Rice Field Tour.   Gueydan and Klondike Area.  Beginning at 3 pm.  

The Vermilion Parish rice tour will include discussions about rice water weevil management, rice varieties, weed control, rice diseases, fertilization, and economics.  

For directions and more information, please contact Stuart Gauthier at sgauthier@agcenter.lsu.edu.  

July 9. East Carrol Parish Rice School.  School will be held in Madison Parish on the farm of Garrett Marsh, approximately 4 miles north of Tallulah on Hwy 65.  Program will begin with registration at 7:15 am.  

Donna Lee and RL Frazier have coordinated an in-field rice school in Madison Parish.  Speakers at the training will include Bill Williams (weed scientist), Johnny Saichuk (state rice specialist) and myself.  We will discuss the latest Research and Extension rice information.  

For more information, please contact Donna Lee at drlee@agcenter.lsu.edu.  

July 14.  Richland Parish Rice Field Day.  Rayville, La.   

There will be a variety of speakers on the program.  I will discuss the results of the rice water weevil demonstration and anything else we are observing in the field.   

For a schedule and directions to the field, please contact Keith Collins at kcollins@agcenter.lsu.edu

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This is a guest post from Acadia Parish county agent Barrett Courville.  Barrett sent out this report to his e-mail list and I thought you would be interested.  Please keep in mind that all chemical recommendations are specific to Louisiana.

Monday was the official first day of summer and the temperatures sure are reflecting that.  Daytime temperatures getting to the mid 90’s and nighttime temperatures in the upper 70’s.  With the high temperatures, we are seeing an increase in insect and disease activity.   

Rice stink bug adult.

This week with the early rice starting to head we are seeing a large population of rice stink bugs.  In the verification field (with Dr. Saichuk) we were catching almost 1 stink bug per sweep.  Very high numbers are being reported throughout the parishes.   The rice stink bug is the second most important rice pest in Louisiana.  They overwinter as adults in grass clumps, ground trash and woods.  They emerge early in the spring and several generations can develop on grasses in and around rice fields.

As the rice begins heading, they move to the rice and begin feeding on the developing kernels.  Adult rice stink bugs are shield-shaped, metallic brown insects about one-half inch long.  Both nymphs and adults puncture the grain with their stylets and suck the juices.  Grain fed on in the early milk stage fail to develop normally and empty glumes or shriveled grain results.  Grains fed on in the dough stage may be weakened structurally and break in the filling process or if infected with a fungus, develop a black spot or pecky rice.  Damage can result in reduced yield, reduced milling quality and lower grade.

Rice stink bug first instar nymphs (photo by J. Saichuk).

Rice fields should be monitored weekly beginning immediately after pollination until kernels begin to harden.  Random sweep net samples should be taken in each field, and the total number of rice stink bugs collected should be recorded.  During the first two weeks of heading, fields where 30 or more stink bugs are taken per 100 sweeps should be treated.  In the later stages of heading, fields should be treated when 100 or more stink bugs are taken per 100 sweeps until two weeks before harvest.  Scout in the morning for best results.

Chemicals recommended for rice stink bug control in Louisiana includes:

Insecticide                                          Dosage Per Acre Active Ingredient

Penncap-M                                         .75 – .5 lbs A.I./Acre

ProAxis                                                .0125 – .02 lb A.I./Acre

Prolex                                                  .0125 – .02 lb A.I./Acre

Mustang Max                                     .0165 – .025 lb A.I./Acre

Malathion 57% EC                              .6 – .9 lb A.I./Acre

Sevin 805                                            1 1/4 – 1 7/8 lb product per acre

Sevin 4F                                              1 – 1 ½ qts. Product per acre

Methyl Parathion 4EC                                    3/4 lb. A.I./Acre

Karate Z                                              .025 – .04 lb. A.I./Acre

Declare                                                .0125 – .02 lb. A.I./Acre

 Remember, as always, follow label instructions.                                              

I am also seeing some grasshopper damage on the rice that is just heading.  The grasshoppers are feeding on the developing grain.  The kernels that are being fed on will abort and not fill.  Very rarely do we need to treat just for grasshoppers but if they are severe a treatment may be necessary.  All of the insecticides listed above except for Malathion and Sevin are labeled for grasshoppers, however; some of the rates are different.  Please be sure to read the label for the correct rates.

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Scouting for borers with Fred Cramer, a Vermilion Parish farmer, and County Agent Stuart Gauthier (Photo by Jarrod Normand).

Is anybody starting to see borers in the field?  They might start to come on as the crop approaches boot.  We recommend that you begin scouting for borers at green ring and intensify scouting as plants get closer to or reach early boot stages.  Look for feeding lesions on the inside surface of the leaf sheath.  If you locate a feeding lesion, check for frass to ensure it is stem borer and not sheath blight damage.  You should also scout for adults, egg masses or fresh feeding scars on the leaves.

To learn more about scouting for borers in rice, please visit the following LSU AgCenter websites:

The LSU AgCenter publication: “Rice pests of Louisiana” contains photographs of rice stalk borers, sugarcane borers, and European corn borers.  This can be accessed at the following link: http://tinyurl.com/3yk458b

For sugarcane borer information see: http://tinyurl.com/3xrsdnm

A powerpoint on European Corn borer and other borers in rice can be found at: http://tinyurl.com/34gvxyt

The Mexican rice borer (MRB) has not been reported in Louisiana since the original detection in December, 2008.  It is important that we remain vigilant in monitoring for this pest.  Please refer to the following ID card for photos of the MRB larval stage: http://tinyurl.com/33ml44r

If you treated your rice with Dermacor X-100 you should have control of borers, but I would still monitor the field because we have limited borer efficacy data in Louisiana.  If you plan to use a pyrethroid to control a borer infestation, it is necessary to apply the foliar treatment before the borer penetrates the stalk/stem.  Once you start to see whiteheads in the field, it is too late to treat for borers.




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LSU AgCenter Rice Specialist, Dr. Johnny Saichuk, posted an insect-focused blog earlier this last week.  He included some pictures I had taken in a field I visited in Madison Parish last week.  There are also some observations from County Agent Stuart Gauthier in Vermilion Parish. 

Please click on the following link to view Dr. Saichuk’s post: http://tinyurl.com/33tml33

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Today we had a nice, but very warm, meeting at the conclusion of the LSU AgCenter Rice Research Station South Farm Tour.  

Farmers, Consultants and Dealers listening in to the presentation at the Hoffpauir Farm in Rayne, La. (photo by Tiffany Pasco)


We met at the Hoffpauir farm to discuss the results of the rice water weevil demonstration.  The purpose of this demonstration is to evaluate the use of some currently available insecticides to control rice water weevils in rice fields.  This location has a very nice layout with multiple cuts of the seed treatments (CruiserMaxx and Dermacor X-100) and also two pyrethroid treated cuts.  These treatments were compared to an untreated cut. 

This location was planted in CL111 at a 65 pounds per acre seeding rate.  Rice was drilled in to a water-leveled prepared seedbed.  The field was planted in soybeans in the 2009 season.  Mr. Darryl Hoffpauir farms these fields and his consultant is Mr. Rustin Gilder (Crowley Grain).  County Agent Barrett Courville coordinated the test location.  We would like to thank Barrett, Darryl and Rustin for their efforts in this demonstration test.  

Below is a description of the activities at the field this season.

Activity Date
Planting 3/23/2010
First emergence 4/03/2010
Scouted for first pyrethroid application 5/04/2010
First pyrethroid application (Karate) to dry ground 5/04/2010
Permanent flood 5/04/2010
Scouted for second pyrethroid application 5/13/2010
Second pyrethroid application (Mustang on fertilizer) into flood 5/17/2010
RWW Core samples taken 6/01/2010

Method of data collection: 

Four weeks after permanent flood we gathered core samples by walking through the field from one corner to the opposite corner in an S-shaped pattern and pulling cores at equally spaced intervals across the field.  RWW core data is an average of 10 cores/field.  Below is our overall level of control from the different treatments.  We had a relatively low weevil population at this site, but all products evaluated provided excellent control.

Treatment Average # rww % Control
CruiserMaxx 0.1 96.6
Dermacor X-100 0.1 97.7
Pyrethroid 0.4 90.7
Untreated 4.3  


The percent control column indicates relative activity of each insecticide by comparison to the population in the untreated check.

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Dr. Saichuk sent out this message today:

The rice blog page I mentioned some time ago is finally up and running.  I have posted all 2010 editions of Field Notes on it.  However, because of the nature of the blog program it is abbreviated in comparison the Field Notes I send out via e-mail.  I will continue to do both.  Some of you may like the format in the blog and others may want the detail of the other form.  Until I learn the tricks of labeling the photographs in the blog I will have to just try to explain them a little better on the blog.

 The blog address is: www.lariceman.wordpress.com.

Let me know if you have any problems accessing it.  There is a way on the blog page to sign up to be notified via e-mail when one has been posted.  Some of you may like that feature especially if you are using portable devices in the field.

 I may also use the blog page to send out something urgent in between regular Field Notes editions so check it out and let me know what you think.


 John K. Saichuk, Ph.D.
LSU AgCenter Extension Specialist
Southwest Region
1373 Caffey Rd.
Rayne, LA 70578
Office: 337-788-7547
FAX: 337-788-7553
Cell: 337-849-6253

Rice Web Page:  http://www.lsuagcenter.com/en/crops_livestock/crops/rice

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Field meeting with Sumitomo and Valent Scientists. We toured Mike Stout's test plots at the rice research station in Crowley. Photo by Tiffany Pasco.

Valent has been working with Mike Stout and other university scientists across the US to develop a new insecticide seed treatment for rice water weevil management in rice.  This product is called NipsitInside and contains the active ingredient Clothianidin.  Clothianidin is a neonicotinoid insecticide.  The neonicotinoid class of insecticides also contains Thiomethoxam (the active ingredient in CruiserMaxx).  

Valent is pursuing a section 3 registration with NipsitInside in US rice production.  The current schedule projects possible registration by 2012.  In order to obtain more data to support the registration package, Valent is preparing to apply for an Experimental Use Permit (EUP) for this product on limited acreage in the delta region states.  This will include 3,000 to 5,000 acres in Louisiana, if the EUP is approved by the EPA.  Valent has applied for a saleable EUP.  If you are interested in planting some NipsitInside treated seed, you can contact Valent Representative John Bordlee for more information. 

If the EUP is approved, we plan to include NipsitInside in side-by-side comparison with Dermacor X-100 and CruiserMaxx in our demonstration test in 2011. 

If you’d like to know more about the efficacy of this product you can contact your local county agents, myself or Dr. Stout.

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We’ve been busy collecting rice water weevil cores samples all over Louisiana for the last couple of weeks.  By the end of next week, we will have sampled most of our sites.  The northern locations will be sampled later in the season.  We are still gathering, entering, and analyzing data, but I wanted to give you a little preview.

Rice water weevil field crew - Tiffany, Lukas, Anna, Nick and I. We've been having fun out in the field this summer.

In general, the populations are higher in Evangeline Parish than Acadia Parish.  At one of our sites, the counts were up above ten on average.  At another location we had 51 larvae in one core sample – this was hybrid rice in an untreated check.  With the size of hybrid plants, we can usually fit one plant in a core.   The other samples in the untreated check  at that site were mostly above ten, and a few near 20, so this is a pretty high population.  Previous research has indicated that a single larva per core can cause .5 to 1.5% yield loss.  Anything above 5 larvae per core is above our economic threshold for treatment.

Lukas and Nick washing the mud off the rice plant roots. Mud is filtered through a seive which leaves behind bits of roots, rice water weevil larvae and pupae.

Plant in a seive - first we count the number of plants per core sample, then we float the sample in a salt solution.

This is what it looks like when the larvae are floated in a salt solution. Each yellow circle surrounds a rice water weevil larvae. The root tips (red arrow) are similar in appearance, but lack the ridged segmentation of larvae. The larvae are counted and sized as small, medium, large to assess the relative stage of development.

Once the data are entered, I’ll start posting some summary tables for the different sites.  We will have a total of 13 to 15 sites this season, so we will have a lot of data to discuss at summer and winter meetings.

We take our core samples 4 weeks after flood.  They are taken at this time, because many years of research indicate this will be a peak in the larval population.  Last week, I noticed that a lot of the larvae are large in size and we’ve also found pupae in samples.  It looks like weevil populations in early planted rice will be pupating and emerging as adults over the next two weeks.  If you have late planted rice that will be going to a flood soon, I would encourage you to monitor closely for adult weevils, and be sure you don’t miss optimal insecticide timing.  Weevils that emerge from early-planted rice will either enter bayous or neighboring late-planted rice fields.

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The new seed treatments are a tool we have available in rice integrated pest managent.  The goal of these treatments is to prevent infestation by rice water weevil larvae.  The two treatments that are available provide variable levels of weevil control.  Historically, Dermacor X-100 has provided a better level of rice water weevil control than CruiserMaxx.  Dermacor typically provides about 95 to 98% control of rww larvae.  CruiserMaxx provides above 80% control.  With this difference in the level of control, it would not be surprising to see some larvae in bucket samples in infested fields.  This year we are evaluating Dermacor X-100 and CruiserMaxx in side-by-side commercial field evaluations.  The data are now coming in.

With a seed treatment it is best not to trust blindly that control will occur because you booked the seed treatment.  I have received a few reports of fields where there was a mix-up with the seed treatment.  The end result was that the seed treatment was not applied on the seed and a weevil infestation was not prevented.  In some cases, this was caught early enough to do something.  In other cases, the rice was past green ring and so there were no options for weevil management.

I’d like to remind everyone to take the time to scout and monitor even those fields that were treated with Dermacor X-100 or CruiserMaxx.  If you happen to find weevil larvae in your field, and you catch the infestation early enough you might need to drain the field.  There are a lot of variables that play into draining – maturity of the crop, time required to drain and reflood the field, availability of water to reflood, and weather conditions.  The LSU AgCenter is not confident in the ability of draining to manage an existing rww infestation, but sometimes this is a measure of last resort.  The research on draining has had mixed results.  We have one drained test plot this year, and Mike and I are discussing some possible research on draining in the future.

If you have fields where the seed treatment is not providing adequate control, please contact me or your local county agent to report the problem.  We are just beginning to take core samples from our test plots.  i will have some results from the core sampling available by next week.

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