Abstract
The alfalfa weevil is a key pest of alfalfa throughout North America, especially in the High Plains region. Overlapping generations of larvae can cause extensive defoliation and reduction in forage yields, and stalk-feeding by adults can impede regrowth after cutting. Most fields in Kansas receive at least one application of insecticide for weevil control in spring, and often multiple applications. However, alfalfa is also a crop that supports a large number of beneficial arthropods, especially aphid predators, due to the perennial presence of various aphid species which are secondary pests, rarely reaching economic levels. Thus, there is a need for materials that are both effective against alfalfa weevil, and selective for the many aphid predators that complete their first spring generation in the crop. A plot trial was laid out in a 40 acre, 3-yr-old alfalfa field that had been over-seeded with oats earlier …
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