June 15 2011 - Comments from the South Farm Tour stop at the Simon RWW test site in Acadia Parish

7/26/2011 8:05:09 PM

RWW demonstration test - Acadia Parish location - Simon Farm.

Originally posted June 15, 2011, by Natalie Hummel on Louisiana Rice Insects.

We had an excellent crowd at the final stop of the LSU AgCenter south farm tour in Crowley, La., this morning. For those of you that could not attend, here is what was discussed:

The RWW is the most important insect pest of rice in Louisiana. Adults enter fields either before or after permanent flood. Injury begins when adults feed on plant leaves, making longitudinal scars. If scarring is excessive the field will sometimes have the appearance of being “painted” with white paint. In some instances adult feeding can be severe enough to merit an insecticide spray before application of permanent flood. Mating commences soon after adults enter the field, but oviposition of eggs occurs after application of permanent flood. Larvae hatch from eggs, feed briefly within the leaf sheath and then swim through the flood water to burrow into the mud and begin feeding on the roots of the rice plant. This larval feeding on the roots is the primary source of damage caused by rice water weevils when they attack the rice plant. In some cases, root pruning can be so severe that plants will fall over in the field. In other cases, root pruning in not severe enough to cause lodging but can still significantly reduce yield.

Acadia Parish – Simon Farm
Location: South of Crowley, La. – at the intersection of Leger and Nelson Roads.You can find a map of the field site by clicking here.

The purpose of this demonstration test is to compare currently recommended insecticides on commercial farms in Louisiana. This year are comparing three insecticide seed treatments (CruiserMaxx, Dermacor X-100 and NipsIt INSIDE) to an untreated check.

Cooperator County Agent Consultant Variety Seeding Rate
Glen & Wes Simon Barrett Courville Rustin Gilder XL745 22 lbs/ac
Planting    Stand count           Permanent flood   RWW core sampling 
03/16/2011           04/03/2011 05/18/2011 06/14/2011

STAND COUNT – 2 weeks after seedling emergence (04/03/2011)
Method of data collection: Counting the number of plants and taking plant heights on ten randomly selected plants at five random locations in each strip.We did not notice any obvious visual differences between seed treatments.

RWW CORE SAMPLING - 4 weeks after application of permanent flood (06/14/2011)
Method of data collection: Core samples gathered by walking through the field pulling cores at equally spaced intervals across the field. 10 samples were taken in each cut (20 cores/treatment).

Treatment Average # rww


Dermacor X-100






RWW core data is an average of 20 cores/treatment. The infestation at this field site did not turn out to be severe enough to justify the cost of a seed treatment, but at some of our other test sites the infestations have been severe. We have collected up to 40 larvae in a single core. Once we are finished with all the core samples and can compare to the small plot trials Mike Stout is conducting at the LSU AgCenter rice research station, we will let you know how all the seed treatments have performed this season.

For Further Information:
If you have any questions about RWW management or this demonstration please contact your local County Agent Barrett Courville or e-mail LSU AgCenter Extension Entomologist Natalie Hummel.

We would like to thank all the cooperators, consultants, sales reps, and dealers participating in this trial. Generous support for this demonstration test has been provided by the Louisiana Rice Research Board, DuPont Crop Protection, Valent, Syngenta, FMC, G&H and Landis International

A lunch was served that was sponsored by Dupont (Toby McCown), Syngenta (Josh Zaunbrecher), and Valent (John Bordlee). Rustin Gilder also provided a tent and tables for the lunch area. You can’t put a price on the value of shade in the middle of the summer (oh, wait, we are only two days in… guess it will be a long one). We appreciate their ongoing support of the LSU AgCenter rice extension entomology program.

Rice stink bugs are starting to show up in some of the fields that are heading. I’ll post a blog about this pest tomorrow. 

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