Overwintering beetles appear in the spring and lay eggs which hatch into larvae that feed upon small grain foliage. CLB larvae appear like small black slugs due to the accumulation of fecal matter on their backs. CLB pass through 1 generation per year, with new adults appearing in late spring or early summer.
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The impact of CLB is generally more important on oats than wheat.
An infestation averaging 1 CLB larvae per stem may result in a loss of 3 bu. of grain per acre. Infestations having 2 or more larvae per stem warrant a chemical rescue treatment.
CLB larval activity becomes readily apparent when about only 1 larvae per 10 stems exists in the field. If a CLB population appears abundant, then a 50 stem sample should be taken by inspecting 5 stems at each of 10 randomly selected loci in a field.
If an infestation approches 2 or more CLB larvae per stem, especially during the flag leaf stage, a rescue treatment should be seriously considered immediately.
Recommended treatments for CLB include the following:
Labeled on oats & wheat
Lannate* SP @ 1/4 to 1/2 #/A or
Lannate* LV @ 3/4 to 1 pt/A
Malathion @ 1 lb a.i./A
(be sure to check label)
Phaser 3 E.C. @ 1/3-2/3 qt/A and 50 WP @ 1/2-1 lb/A
Tracer @ 1 to 3 fl oz/A
(labeled only on wheat)
Sevin XLR Plus @ 1 qt/A, 4F @ 1 qt/A and 80S @ 1 1/4 lb/A
Warrior* 1CS @ 2.56 to 3.84 fl oz/A
* Use is restricted to certified applicators.
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