From genetic studies of corn at the Connecticut Agricultural Experiment Station came in 1917 the four-way cross that made hybrid corn practical, and in 1951 the pollen sterile-restorer gene method of producing hybrid corn without detasseling.

In cooperation with USDA, the Nevada Agricultural Experiment Station has developed two new varieties of alfalfa. Lahontan, a winterhardy variety, is resistant to spotted alfalfa aphid, bacterial wilt, and stem nematode. Moapa, a non-winterhardy variety for the warmer areas of the Southwest, is resistant to spotted alfalfa aphid. Aphids killed susceptible Calverde variety.

Dr. Darrell Sullivan of the New Mexico Agricultural Experiment Station inspects a Thompson Seedless grapevine treated with gibberellic acid to increase berry size. Research is being conducted to test grape rootstocks for high production under New Mexico conditions.

The Tennessee Agricultural Experiment Station is working to develop varieties of tobacco resistant to black-shank disease. Resistant varieties Burley 37 (left) and Burley 11-A (right) outproduce susceptible variety Burley 21 (center).

Breeding research at the Wyoming Agricultural Experiment Station has contributed to the development of these fine- and medium-type crossbreeds from Rambouillet foundation sheep, shown here on a ranch in the Red Desert area.

Beef cattle breeding research at the Nebraska Agricultural Experiment Station is aimed at developing economically important traits such as productive efficiency and desirability of product. (Photo: courtesy Nebraska Farmer.)

The Alabama Agricultural Experiment Station has contributed substantially to growth of the cattle industry in the State through research in forage plant breeding, pasture management, and livestock improvement.

In experiments by the Oklahoma Agricultural Experiment Station and the U.S. Department of Agriculture, scientists are learning much about breeding genetically superior animals. These twin cows have each produced 11 calves. Those dropped by the cow on the left weighed an average of 533 pounds at weaning; those by the cow on the right, 384 pounds.