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Posts Tagged ‘2008’

If you reach way back in your memory, some of you may remember completing the 2009 Louisiana rice insects survey at one of the winter production meetings back in January or February of this year.  The surveys were distributed in Louisiana, Texas, Missouri, Mississippi and Arkansas this year.  Anna and I have recently completed a summary of the responses and I’ll use this series of posts to provide an overview of a few observations.  Keep in mind that the trends reported in this posting relate to the 2009 production season, not the 2010 production season.  We will distribute a survey about the 2010 production season at the winter meetings in January.

Participants from the circled Louisiana parishes completed our survey.

184 survey sheets were processed from the following states: Louisiana (146), Texas (47), Missouri (5), Mississippi (2), and Arkansas (1).  In Louisiana, respondents from the following parishes completed surveys: Acadia, Avoyelles, Beauregard, Calcasieu, Caldwell, Cameron, Catahoula, Concordia, East Carroll, Evangeline, Franklin, Jefferson Davis, Lafayette, Madison, Morehouse, Ouachita, Point Coupee, Rapides, Richland, St. Landry, and Vermilion (see map above).  

We would like to thank all rice industry members who participated in this survey and helped to distribute the survey sheets. This survey was supported in part by the Louisiana Rice Research Board and the Southern Region Integrated Pest Management Program.

My comments will mostly be confined to the Louisiana responses at this time.  The demographics of the participants in Louisiana was broken down as follows: rice farmers (79%), consultants (12%), dealers (7%), and others (10%, e.g. county agents, researchers, manufacturer representatives, marketing managers and land owners).  The length of time that repondents have been involved with rice production varied from less than five to more than forty years, with the greatest percentage (18%) with 26 to 30 years of experience.  Approximately 76% of the survey respondents farmed or consulted on less than 2500 acres of rice in the 2009 production season.

The first series of questions related to insect infestations which were severe enough to warrant an insecticide treatment.  92% of Louisiana respondents reported that they had some fields that required treatment for rice water weevils.  88% of the respondents reported problems with rice stink bugs.  While fewer people reported infestations of grasshoppers (24%), armyworms (24%), and chinch bugs (23%).  The next most commonly reported insects were the rice leafminer (12%), stalkborers (11%) and colaspis (11%).  Less than 10% of repsondents reported infestations of rice seed midge, aphids, rice levee bill bug, or south American rice miner that warranted an insecticide treatment. 

We asked more detailed questions about rice water weevil management strategies.  A large portion of our time is dedicated to rice water weevil management because this insect traditionally causes the most significant damage to Louisiana rice production from season to season.

In both the 2008 and the 2009 production season survey, we asked the following question:

If rice water weevils were a problem in your rice field(s), which method did you use to control or prevent a rice water weevil infestation? Note that respondents could choose more than one answer since they are completing a survey that relates to more than one production field.  That will explain why the total response does not equal 100%.

In 2008, among 163 respondents in Louisiana, the most common method used to control or prevent rice water weevil was drained field (43%).

In 2009 among 130 respondents in Louisiana, the most common method used to control or prevent rice water weevil was Dermacor X-100 seed treatment (52%).  In 2009, this was the only seed treatment available for use in rice.

Method used to control rice water weevil in Louisiana rice fields

2008 Percentage (%) 2009 Percentage (%)
Drained field 43 34
Post-flood treatment with a foliar spray of pyrethroid 39 44
Pre-flood treatment with a foliar spray of pyrethroid 36 37
Pre-flood treatment with a pyrethroid impregnated on fertilizer 21 22
Post-flood treatment with Trebon 20 10
Early planting to avoid infestation 18 31
Dermacor X-100 Seed Treatment 17 52
Pre-flood and Post-flood treatment with a pyrethroid 13 N/A
Delayed application of permanent flood 13 27
Pre-flood treatment with Trebon 9 7
Nothing 6 7

 

 

 

 

 

 

 

 

 

 

 

 

 

 

There was a decrease in the percentage of respondents who reported that they drained a field for weevil management while their was a substantial increase in the adoption of seed treatments and cultural practices (early planting and delayed application of permanent flood) which should result in decreased weevil injury.

The next installation in this series of blog posts will focus on questions related to rice stink bug management.  Do these observations reflect what you experienced in the 2009 or 2010 production seasons?

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