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Over the weekend Sebe Brown scouted a field in Concordia parish where the stand was being severely reduced by colaspis larvae feeding on seedlings. Problems with this field started on March 16 when the stand began to decline. The plants were described as yellow and stunted. This was a Dermacor X-100 treated hybrid rice field no-till drill-planted at a 23 lbs/acre seeding rate. Surrounding fields were growing nicely. When Sebe scouted the field on Saturday he confirmed that the injury was being caused by Colaspis larvae feeding on the roots of seedlings. The stand was reduced about 40% by this injury. The recommendation was made to establish a shallow permanent flood to avoid further injury. In a situation like this, where the rice isn’t quite ready for a flood, you may lose some injured plants to the flood. The alternative is to wait to establish flood, during which time the colaspis will continue to injure the seedlings and further reduce the stand. Establishment of a flood on the field will prevent further feeding injury by the colaspis larvae and eventually the larvae will die. Note: according to experts in Arkansas it may take up to a month for colaspis larvae to die in the permanent flood. Click here to read more about colaspis. You can watch a video on how to scout for colaspis here. The Dermacor X-100 should provide about 30% suppression of the colaspis infestation. Next season, they will consider using a CruiserMaxx or NipsitInside seed treatment to target control of colaspis. The use of pyrethroids will not provide control of colaspis because they are injuring the crop below the soil line.


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The 2010 Concordia Parish Crop Production Meeting & Pesticide Recertification will be held at the Monterey Baptist Church, Monterey, LA tomorrow, January 29, 2010.  The morning session will focus on soybeans.  I will be speaking during the afternoon rice production session.  My comments will focus on the results from the 2009 rice water weevil demonstration test, and also how to scout for colaspis in rice.  I hope to see many of you at the meeting.  During lunch I’ll meet with Dale Denais to discuss plans for the demonstration site at Angelina Plantation this season.

The program for the afternoon session is listed below.

1:15     Rice Weevil & Insect Control

Dr. Natalie Hummel, LSU AgCenter Rice Entomologist

1:35     Rice Fertility Recommendations

Dr. Steve Linscombe, LSU AgCenter

1:55     Rice Weed Control

Dr. Bill Williams, LSU AgCenter Weed Specialist

2:15     Rice Production Practices & Variety Recommendations

Dr. Johnny Saichuck, LSU AgCenter Rice Specialist

2:35     Adjourn

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