Couplet 20

10/24/2010 8:37:18 PM

10
20a.
Black and white bug hiding in dirt cracks.


Insect may be:
20b.
Stunted, dying plants; small bug that is orange with tan band.

Insect may be:



CHINCH BUG ADULT



CHINCH BUG
YOUNG NYMPH





Photo by: Johnny Saichuk

Photo by: Johnny Saichuk

CHINCH BUG
adults are small, black insects with white front wings with a triangular black spot near the outer wing margin (1/6-inch long). Adults lay eggs behind the lower leaf sheaths or in soil near roots. Eggs turn red as they mature and larvae emerge in about one week. There are five nymphal instars. Early instar nymphs are red with a yellow band on the front part of the abdomen. Last instar nymphs are black and gray with a conspicuous white spot on the back. The life cycle from egg to adult takes about one month, and adults may live two to three weeks.

Facts:
  • Chinch bugs overwinter as adults in grass clumps, leaf litter and other protected areas, before feeding and mating on grass hosts including small grains such as wheat, rye, oats and barley.
  • As these crops mature and are harvested, large numbers of chinch bugs may move to nearby rice fields.
  • If abundant, chinch bugs can kill young plants, severely reducing plant stands.
  • Feeding on young seedlings causes leaves and stems to turn light brown.

What you should look for:

  • Check foliage of un-flooded rice every three to five days from seedling emergence until application of permanent flood

How you can manage the chinch bug:

  • Cultural control: flood infested fields to kill chinch bugs or to force them to move onto rice foliage where they can be treated with an insecticide.




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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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