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This morning I met with County Agent Stuart Gauthier, Rice producer Richard Hardee and Consultant Chuck Greene at the demonstration site in Vermilion Parish just outside of Gueydan. 

Meeting with cooperators Chuck Greene, Richard Hardee and County Agent Stuart Gauthier near Gueydan, La.

This part of the state is really hurting for water – I read the local paper where the headline was the extreme need for water.  Some parts of the parish had less than 1/2 inch of rain in April, and other areas had no measurable rain.  Compounding the lack of rain is the lack of fresh surface-water available.  The parish is still suffering from the effects of salt water intrusion caused by the hurricanes. 

Fortunately, Richard has access to a well, and we are completing the application of permanent flood on this site.  Mr. Greene walked the field with Richard last week to make the decision about a pyrethroid application before permanent flood.  Weevil scarring was not abundant in the field and he was hard-pressed to find an adult weevil.  The decision was made to wait for a pyrethroid application until after permanent flood.  Permanent flood is the trigger for rice water weevil adult oviposition (egg laying).  

Today we scouted the field that was slated to receive a pyrethroid application – if scouting determined it to be necessary.  We were able to find about 10 rww adults, 2 of which were a mating pair.  

Rice water weevil adult.

 

We also found an abundance of fresh feeding scars.  

Rice water weevil scars on a rice plant leaf.

 

Stuart also noted that many of the rww adults he found were below the surface of the water – these are probably females laying eggs.  

Chuck Greene and I discussed our options and decided a weevil treatment was needed.

 

Chuck and I discussed the situation with Richard and decided that a pyrethroid spray is now warranted.  We recommended between 1.7 and 2 fl oz per acre of Karate be applied sometime this week when the wind is calm (today was pretty windy).  We plan to go back in and scout in one week to make the decision about the need for a second application. 

Also at this site, we will possibly evaluate draining a cut to look at the effect of draining on rww population in an infested field.  I’ll keep you updated on how that goes.  We will take core samples in approximately 4 weeks to evaluate the insecticide treatments.(Photo credits: all photos taken by Anna Meszaros, LSU AgCenter.)

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On Friday we met with Stuart Gauthier and Alden Horton to scout for adult rice water weevils at the Vermilion Parish water-seeded test site.  This field is making good progress, and has an excellent stand, for the most part.  

We have a healthy water-seeded stand of rice.

  One of the high parts of the field had poor emergence due to a combination of dry soil and water mold. 

Standing in the thin stand of the field and looking to the nicely growing portion.

Some of the seeds germinated and then dried-out.

The un-emerged seeds, with the dark brown ring around them, were killed by water mold.

We visited the field to make a decision about rww insecticide applications.  We scouted ten sites in the field for the presence of rice water weevil adults and feeding scars.  We did not find any rww adults or feeding scars.  The decision at this time was to hold off on an insecticide application and scout again for adults or scarring before the final application of newpath on Friday.

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