Integrated Crop Management News

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Scouting for alfalfa weevil larvae is not that difficult, although it takes several minutes when done properly. In any alfalfa field, I prefer to start my scouting with a sweep net. A sweep net and a quick and easy method of answering the question, "are there alfalfa weevil larvae in the field?" By taking 40-50 sweeps in an area, it can easily be determined if larvae are present or not. If larvae are found, then proceed to the stem-sampling technique, which is used to determine the economic threshold. Stem sampling can more accurately determine the population size and the potential for yield loss.

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Iowa State University



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