How to Manage Pests
UC Pest Management Guidelines
Scientific name: Euschistus spp.
In this Guideline:
DESCRIPTION OF THE PEST
Stink bugs are
medium to large-sized bugs. Those that attack small grains are commonly grey
brown to green in color and 0.38 to 0.5 inch long. Their bodies have a
characteristic shield shape with a large triangle on the center back. They are
most common where cereals are planted adjacent to rangeland near the foothills
Damage usually occurs when stink bugs feed in the head during milk or soft dough stage.
Observe fields frequently after heading,
particularly those adjacent to desert or rangeland. If vegetation in areas surrounding
the field is beginning to dry up, make more frequent observations. Using a
sweep net, sample the margins, then move toward the center of the field; initially,
stink bugs are generally confined to the edges of the field.
No economic thresholds have been
established for stink bug. No chemicals are currently registered for use
against stink bug on barley, wheat, oats, or rye.
UC IPM Pest Management Guidelines: Small Grains
UC ANR Publication 3466
Insects and Mites
C. G. Summers, Entomology, UC Davis/Kearney Agricultural Center, Parlier
L. D. Godfrey, Entomology, UC Davis
Acknowledgment for contributions to Insects and Mites:
D. Gonzalez, Entomology, UC Riverside
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