MEADOW SPITTLEBUG

In the spring, 1st cutting alfalfa may have significant numbers of spittle masses, which provide anenvironment for development of MSB nymphs feeding on the plant host. Although treatment for MSB alone is rarely warranted, the presence of 1 or more spittle masses per stem plus a marginal weevil infestation may warrant a rescue treatment.
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Corn, Soybean, Wheat, and Alfalfa Field GuideBulletin 827