Bacterial Leaf Spot of Alfalfa '

The bacterial leaf spot described here was first recognized on Turkestan and Grimm alfalfa (Medicago sativa L.) in two locations at Madison, Wis., in August 1930. The alfalfa in both instances was in cultivated experimental rows and had been repeatedly splashed bywatering with a garden hose. In October 1931 the disease recurred under similar circumstances at one of these locations, but with the abandonment of alfalfa growing at these places the disease has not been seen during the three following summers. At no time has it been found in alfalfa fields. These observations, together with the results of inoculations, suggest that while the disease appears potentially destructive, it does not often find favorable conditions for development in this locality. Inasmuch as it may develop elsewhere and may easily be mistaken for other well-known diseases, its description seems warranted.