C18

10/22/2010 5:29:56 AM

10

18a.
Translucent creamy-tan body with golden-brown head capsule; paired brown dashes running length of body.

Insect may be:

18b.
Creamy-tan body with brown head capsule.



MEXICAN RICE BORER





Photo by: Anna Meszaros


Photos by: Natalie Hummel


MEXICAN RICE BORER
adult moths are light-tan colored with delta-shaped wings. Adult moths lay eggs on leaves, sheaths, and stems. Young larvae feed on the tissue inside the leaf sheath and bore into the rice stem after about one week of feeding. Larvae are honey colored with two pairs of stripes running the length of the body. Pupation takes place inside the rice stem.

Facts:

  • Early infestations are noticed when the youngest partially unfurled leaf of the rice plant withers and dies, resulting in a condition called deadheart.
  • Stem feeding during panicle development causes whiteheads.
  • Severe infestations cause stalk breakage and plant lodging.
  • Once larvae enter the stalk pesticides are not effective.

What you should look for:

  • Begin scouting for stem borers at green ring and intensify at early boot stage.
  • Feeding lesions on the inside of the leaf sheath.
  • Frass, to ensure it is not sheath blight damage

How you can manage the Mexican rice borer:

  • Destroy crop residues after harvest.
  • Plant early in areas with a history of borer infestations.
  • Apply insecticides to coincide with larval emergence to kill larvae before they enter the rice stalks or during the time they feed on the inside surface of the leaf sheath



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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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