Cereal Leaf Beetle in Wheat

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Is Cereal Leaf Beetle a problem in your wheat crop this year? CLB is a pest that tends to localize in pockets in a region and also in hot spots in the field. Learn more in this new, 2-minute video!

Identification:

elongated beetle

CLB Adult

Adults lay tiny eggs are laid on the upper surface of the leaf. When eggs are first laid they start out yellow then they turn to orange then to brown and then to black.

photo of two tiny, orange eggs

CLB eggs on the upper side of the leaf.

The presence of eggs in the field is important but does not warrant sprays yet because eggs are often killed by rain, and insecticides are much more effective on the larvae.

The larger larvae get and the higher up on the plant they feed, the greater the impact on yield.

small, slug like larvae on leaf

CLB larvae feeding on upper leaves can cause yield loss

Scouting:

Select 10 random spots in the interior of the field, and look at 10 tillers from each spot. On each of those 100 tillers count how many eggs there are, and how many larvae there are. If there are more eggs than larvae in the field recheck those locations in 7-14 days.

Threshold:

If there are more larvae than eggs AND there are 25 eggs plus larvae per 100 tillers, that’s when we need to consider control options. If your field is above the threshold of 25 eggs plus larvae per 100 tillers you may want to consider watching the video in the link below. It’s Dr. Reisig’s virtual field day presentation on IPM strategies versus Tank Mixing for control of Cereal Leaf Beetle.