Life tables were constructed for the asparagus aphid,Brachycorynella asparagi, caged on different ages of asparagus foliage. In trial one of the experiment, foliage age ranged from 16 to 72 d. As foliage aged, the intrinsic rate of aphid increase declined, generation time increased, projected population size decreased, prereproductive and reproductive periods lengthened, and maximum number of offspring per day declined. In trial two, foliage age ranged from 15 to 138 d. Only 3 of 10 aphids survived to reproduce on 97-d-old foliage, and none reproduced on 138-d-oldfoliage. In trial two, prereproductive period was lengthened and day of maximum reproduction was delayed by increased foliage age. The net reproductive rate was not significantly affected in either trial. It appears that the quality of asparagus as food for the asparagus aphid declined as foliage aged.