Spotted alfalfa aphid
Therioaphis maculata

The spotted alfalfa aphid is a small, pale yellow or grayish aphid with four to six rows of spined black spots on its back. Mature females may either be wingless or have wings with smoky areas along the veins. This aphid prefers warm weather and is generally found during summer months. In the Imperial Valley, high populations may continue into fall and winter.