Winter wheat leaves affected by cereal leaf beetle, University of Idaho Parma R&E Center, Parma, ID, April 7, 2016.
Adult Cereal Leaf Beetle in winter wheat, Parma R&E Center, SW Idaho. April 7, 2016
Cereal Leaf Beetle larva.
Cereal leaf beetle eggs, Parma R&E Center, SW Idaho, April 7, 2016
|Cereal Leaf Beetle eggs. Phillips et al., 2011 (http://jipm.oxfordjournals.org/content/jipm/2/2/C1.full.pdf)|
Cereal Leaf Beetle larva and eggs, Parma R&E Center, SW Idaho, spring 2015.
The first symptoms of infestation became apparent during the last week of March. Currently, many plants have at least one leaf with some feeding damage. The cereal leaf beetle has a variety of hosts among cereals and grasses with preference to oat, barley, wheat, rye, timothy, fescue, grain sorghum and corn. Substantial crop yield loss and quality decrease can be expected due to lost photosynthetic activity resulting from the feeding damage.
Cereal leaf beetle is a quarantined insect the U.S., which means that the presence of beetles in grain restricts exports to uninfested areas. Fumigation is required to prevent the spread of beetle infestation.
Scouting of fields is vital both before and during the boot stage to assess for cereal leaf beetle presence and damage. It is recommended to scout weekly by walking through the field in a “W” pattern for best coverage. Stop at 5-10 locations depending on field size and examine 10 plants per location. Count the number of eggs and larvae per plant for smaller plants or per stem for larger plants.
Treatment thresholds: 3 larvae per plant and/or 3 eggs per plant before boot stage, and 1 larva per flag leaf after boot stage.
Management-chemical control (From PNW Insect Management Handbook)