Couplet 13

10/22/2010 6:54:19 AM

10

13a.
Reduction in stand, orange discoloration of leaf, stunted dying plants.

 


13b.
Reduction in stand, dying plants near healthy plants; c-shaped larva with spines visible, golden-brown head capsule.


Insect may be:






COLASPIS LARVA


                            



Photo by: Natalie Hummel

Photo by: Natalie Hummel


























































There are two species of COLASPIS that can be found in Louisiana rice: Colaspis brunnae and Colaspis louisianae. This pest can be found damaging fields of dry-seeded rice in a soybean-rice rotation. Colaspis will complete a single generation in soybeans and lespedeza. The larvae of colaspis will overwinter in the soil. When rice, or another crop, is planted into a field that is infested with colaspis larvae, the larvae will begin to feed on the roots of the plant. Feeding on fine root hair may result in plant death. The larvae will then pupate and emerge as adults. Adults are oval in shape and about 1/4 inch in length. They are a light golden color with white/gold stripes down their back and long antennae. Adults will not lay eggs on rice, but will most likely travel to a near soybean field. It is common to find a clumped distribution of larvae in the soil and patches of stand loss.

What you should look for:
  • To scout this pest, located plants that are stunted, dying and surrounded by declining plants. The plants will often appear withering or drying.
  • Dig around the base of the plants, carefully peeling back the soil and looking for white grubs with brown heads, being slightly larger than RWW larvae. Pupae or adults may also be found in the soil.

How you can manage colaspis:

  • There are no specific pesticides to control colaspis in louisiana rice.
  • Only recommendation is to apply permanent flood as soon as possible.
  • These insects are not aquatic so they cannot survive a permanent flood.


    Colaspis in rice

    How to Scout for Colaspis in Rice Video

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    For more information, please see the Rice section of the Insect Pest Management Guide on the LSU AgCenter's Management Guides webpage.

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