Now is the time to scout for alfalfa weevil larvae in most crop reporting districts in Iowa. The scouting threshold has not yet been reached for northern and west central districts of the state but scouting dates are coming up quickly. Growers in the southern three districts should start scouting for larvae at 200 growing degree days (using a base of 48 F), while those in the central and northern regions should start scouting at 250 growing degree days. This means that growers should presently be scouting fields in southern and most of the central districts of the state. Scouting for larvae should begin May 4 in the west central district and May 7 for all three northern districts of Iowa (Figure 1).
Iowa State University
Sisson, Adam and Hodgson, Erin W., "Alfalfa Weevil Scouting in 2010" (2010). Integrated Crop Management News. 468.
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