WL 216

1.  A 3-clone synthetic derived from 4th and 5th cycle progenies of spotted alfalfa aphid survivors intercrossed after each cycle of screening. The original parentage traced to over 16,000 seedling plants of Vernal, Culver, Minnesota 59-126-2, Nebraska 67-2813, and four falcata crosses between P.I. 231,731 and purple-flowered selections from Vernal. The falcata crosses were made among moderately resistant and/or tolerant plants to the spotted alfalfa aphid in 1960-61. The best four F₁ plants in aphid reaction were inter crossed and exposed to heavy spotted alfalfa aphid populations four times. Simultaneously, selections and intercrossed progenies from the other parentage were similarly screened four to five times prior to 1967, when a number of test synthetics were made for forage testing. These were Ca 801, 802, 803, 804, 805, 806, 85