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Posts Tagged ‘seed treatment’

This morning I received another call about chinch bugs infesting seedling rice – this is the fourth call I’ve had this season, so I want to remind field scouts to be on the look-out for this pest. So far they have been reported in Jeff-Davis, Evangeline and St. Landry Parishes. Chinch bugs can quickly move in and reduce a stand of rice. Click here to read more about chinch bugs and the damage they can cause to a rice field. Rapid identification and a prompt response are key to minimize the impact of a chinch bug infestation.

In one case, there was a minsconception that Dermacor X-100 would control chinch bugs. While these new chemistries provide excellent control of rice water weevil larvae, they are often limited in their ability to control other insects. Keep in mind that each of the seed treatments controls a specific group of pests. 

Below is a list of the available seed treatments registered for use in Louisiana rice production and which pests they can control (or at least suppress):

CruiserMaxx & NipsitInside should control infestations by the following:

  • Rice water weevil larvae
  • Rice water weevil adults – suppression
  • Chinch bugs
  • Colaspis larvae
  • Thrips
  • Aphids

CruiserMaxx and NipsitInside will not control infestations by the following:

  • Fall armyworms
  • Stem borers
  • Seed midge
  • Rice leafminer
  • South American rice miner
  • Stink bugs attacking late-season 
  • Spider mites

Dermacor X-100 should control infestations by the following:

  • Rice water weevil larvae
  • Rice water weevil adult – minimal suppression
  • Colaspis larvae – suppression
  • Fall armyworms
  • Stem borers
  • Rice leafminer
  • South American Rice Miner
  • Seed midge (although this should not be a problem in drill-seeded rice)

Dermacor X-100 will not control infestations by the following:

  • Chinch bugs
  • Thrips
  • Aphids
  • Late-season stink bugs
  • Spider mites

To learn more about identification of the different insects that attack rice, please visit the LSU AgCenter Rice Insect Identification guide by clicking here.

You can read more about the seed treatment options by viewing the presentation I gave at the Louisiana Agricultural Consultants Association Meeting in Feb 2011.  It is can be downloaded by clicking here.

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Today Anna and I met with County Agent Barrett Courville and Crop consultant Rustin Gilder at the Acadia Parish demo site which is farmed by Glen and Wes Simon. We were pleased to find a healthy, rigorous stand of rice. Much of the field is already at tillering stage just two weeks after seedling emergence! This location was planted with XL745 at #25 seeding rate.

We used the same method as last year – counting the number of plants and taking plant heights on ten randomly selected plants at five random locations in each strip.

Anna Meszaros and Barrett Courville taking stand data in Acadia Parish.

We did not notice any obvious visual differences between seed treatments (at this location we are comparing CruiserMaxx, Dermacor X-100, NipsitInside to an Untreated check). The following series of pictures includes every possible side by side comparison of treatments:

Rice grown from CruiserMaxx treated seed to the right and Dermacor X-100 treated seed to the left.

Rice plants grown from CruiserMaxx treated seed to the right and Untreated seed to the left.

Rice grown from Dermacor X-100 treated seed to the right and NipsitInside treated seed to the left.

Rice grown from NipsitInside treated seed to the right and CruiserMaxx treated seed to the left.

Rice grown from seed treated with NipsitInside to the right and untreated seed to the left.

Rice grown from Untreated seed to the right and Dermacor X-100 treated seed to the left.

It was not difficult to find rice water weevil adult scarring in the field. We did not observe any rice water weevils.  The field had recently received a flush. It was difficult to assess a difference in the severity of scarring between treatments, but our sense was that it was a little more prevalent in the untreated strips.

Rice water weevil adult scarring injury on an untreated plant.

We will continue to monitor this field for any other insect problems that might occur. The next step will be to take rice water weevil core samples four weeks after permanent flood.

It sure is dry out there – we could use some good rain. In these dry conditions it is important to remember to actively scout for chinch bugs – they tend to thrive in these dry conditions, especially if weeds or pasture near a rice field start to dehydrate.

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Last week we planted the rice water weevil demonstration test sites in Evangeline and St. Landry Parish. Both locations are the hybrid variety XL745. At each location we will be comparing the seed treatments CruiserMaxx, Dermacor X-100 and NipsitInside to an untreated check.

Drilling the strip trial at Fontenot farm in St. Landry Parish.Rice was planted using a 42 foot wide drill pulled by a John Deere.GPS monitoring of planting plots.

The GPS monitoring system was used to line up each of the strips – each treatment was replicated twice across the field.

Drill rows in the field.

Charlie will be growing 1200 acres of rice this year.  This is the last bit of rice he is planting for this season.  Soil conditions were ideal for drilling.  A nearby field has been planted in a Horizon Ag strip trial to evaluate varieties.

LSU AgCenter County Agent Vince Deshotel vacuuming treated seed out of the drill between treatments.

Vince Deshotel vacuumed out the drill between treatments.  We also gathered seed samples and will send them off for analysis to confirm the rate of insecticide applied to the seed.

Dean Reed, Charlie Fontenot and Vince Deshotel after successfully planting our test plots.

We greatly appreciate the help of Dean Reed, Charlie Fontenot and Vince Deshotel in planting this demonstration test site.  Without excellent on-farm cooperators our programs would lack the depth on “real-world” situations. We will let you know when the rice emerges.

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On March 16, 2011, we planted our first site for the 2011 LSU AgCenter rice water weevil demonstration test.

Acadia Parish County Agent Barrett Courville following the drill as we planted the test plots.

The purpose of our rice water weevil demonstration test is to compare currently recommended seed treatment insecticides on commercial farms in Louisiana. This year we are comparing three insecticide seed treatments (CruiserMaxx, Dermacor X-100 and NipsitINSIDE) to an untreated check. 

Rustin Gilder walking near the flagging on the edge of the plots. Flagging is color-coordinated with the treatments to make it easier to monitor progress during the season.

Here are the details about the Acadia Parish test site:

Parish Acadia
Cooperator Glen Simon & Wes Simon
County Agent Barrett Courville
Consultant Rustin Gilder
Distributor Crowley Grain
Variety XL745
Seeding rate 22
Drill width 36
Length of field 700
Acres per treatment 10.00
Total acres 40
Total lb seed 220
CruiserMaxx – A 15.4 fl oz total
Dermacor X-100 – B 17.5 fl oz total
Nipsit-Inside – C 4.22 fl oz total
Untreated – D no insecticide

We will take stand counts and plant height data 2 weeks after seedling emergence.  To assess insecticide efficacy, we will collect rww soil cores 4 weeks after application of permanent flood.

Field map with color-coding for the treatments. Feel free to drive by and watch the field as the crop matures during the season.

We intend to have a tour stop at the demo test site at the conclusion of the LSU AgCenter South Farm Tour this summer.  Please monitor the blog for an announcement about the date and details.

Acadia Parish Demo test cooperators Wes Simon, Rustin Gilder, Terry Istre and Barrett Courville.

We greatly appreciate the tremendous effort in time and land-use by our cooperators. We will keep you posted on the progress at this site.  For additional information, please contact Barrett Courville.

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This article is reprinted from the LSU AgCenter Rice Research Station newsletter.

Authors: Natalie Hummel and Michael Stout

Rice farmers in Louisiana who use seed treatments to manage insect pests in their fields have a choice of seed treatments in 2011: Dermacor™ X-100 (DuPont Crop Protection) and  CruiserMaxx® (Syngenta).  In addition, Valent has requested an experimental use permit (EUP) for NipsitInside seed treatment, an insecticidal seed treatment alternative similar to thiamethoxam.  If approved, NipsitInside will be used on a limited number of acres in Louisiana in 2011 and will potentially be available on a wider scale in 2012.  Although these three insecticidal seed treatments are similar in many respects, they also differ in key ways.  Understanding the similarities and differences between the two seed treatments is crucial to making the right insecticide choice for each rice field.

The key pest targeted by CruiserMaxx, Dermacor X-100, and NipsitInside is the rice water weevil, the most important early season insect pest of rice in Louisiana.  Dermacor X-100 has been evaluated against the rice water weevil in multiple small-plot tests over many years at the LSU AgCenter Rice Research Station in Crowley, and in addition has been used commercially in Louisiana the past three growing seasons.  Dermacor X-100 provides excellent control of rice water weevil larvae; in commercial fields, weevil populations were typically reduced by 90-95% compared to fields not treated for weevils.  CruiserMaxx has also been evaluated in multiple small-plot trials over the past several years at the Rice Research Station, and it too provides good control of rice water weevil larvae, although, in side-by-side comparisons of Dermacor X-100 and CruiserMaxx conducted in small plot trials at the Rice Research Station, control of weevil larvae given by CruiserMaxx is generally not as good as control given by Dermacor X-100.  In rice water weevil demonstration tests in commercial fields in 2010, we found that Dermacor X-100 provided the best level of weevil control, followed by pyrethroid (Karate pre, Karate pre + mustangMax on fertilizer post, or Karate post) and CruiserMaxx.  Dermacor X-100 provided significantly better control than the other two treatments.  There was no significant difference in weevil control between the pyrethroid and the CruiserMaxx seed treatment.  Unfortunately, the results from hybrid test plots (25 pound seeding rate) in 2010 did not provide any more clarity about the ability of CruiserMaxx to provide effective weevil control at the low seeding rates.  We plan to repeat the demonstration test again next season, particularly focusing on the low seeding rate question.  Small plot replicated research that may also clarify the question of effectiveness of CruiserMaxx at low seeding rates will also be conducted.  

Probably the most important difference between the three seed treatments is their activity against secondary pests.  Because these chemicals belong to different chemical classes (the active ingredient in Dermacor X-100 is a type of anthranilic diamide, whereas CruiserMaxx and NipsitInside are neonicotinoids), they are effective against different pests.  CruiserMaxx and NipsitInside will probably provide better control of colaspis larvae (present in a few fields in southwest Louisiana in 2009 and 2010) than will Dermacor X-100, and will also provide good early-season control of sucking insects such as aphids, thrips and chinch bugs.  Dermacor X-100, on the other hand, should provide excellent control of early-season Lepidopteran pests such as fall armwyorms.  Recent evidence from both Louisiana and Texas indicate that Dermacor X-100 provides protection against stem-boring insects.  Evidence from Texas also indicates that Dermacor X-100 may help control South American Rice Miner in rice.  The spectrum of pests controlled by each of these seed treatments is probably the most important consideration in choosing between the three.  As a related consideration, CruiserMaxx is marketed as part of a seed treatment “package” (CruiserMaxx® Rice) that includes fungicides that may help control seedling diseases and rice blast.

There are also similarities and differences in the agronomic practices that are used with each of these seed treatments.  Importantly, the use of both seed treatments is restricted to dry-seeded (drill-seeded or dry broadcast) rice; neither product can be used in water-seeded rice.  Also, the per-seed application rate of CruiserMaxx will not change with rice seeding rate, unlike Dermacor X-100, for which application rate is adjusted for seeding rate.  This may make CruiserMaxx easier to use, but it should be noted that the use of CruiserMaxx at very low seeding rates (for example, seeding rates typically used for hybrid rice varieties) has not always provided acceptable control in tests conducted by LSU AgCenter.  Details on the use patterns for NipsitInside are not known yet.

The expected availability of three seed treatments for insect control in rice, along with other available products for insect control (Karate, Mustang Max, and the other pyrethroids), gives Louisiana farmers a wide range of options for managing their insect pests in drill-seeded rice.  Unfortunately, there are not as many choices in water-seeded rice, and expanding the range of options for insect management in water-seeded rice is a continuing focus of research for the Entomology program.  

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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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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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