Overwintering in the Egg Stage by the Spotted Alfalfa Aphid in Nebraska1

The spotted alfalfa aphid (Therioaphis maculata (Buckton)) has not previously been reported overwintering north of Kansas and the only report of egg laying was from California where all eggs produced were unviable. Observations are presented on the production of viable eggs by this species in a very limited area of Nebraska during the fall of 1960. These eggs hatched during April 1961.