78 James G. Horsfall 



collect a fungus similar to S. meliloti on alfalfa, for he makes no mention 

 of it. 



Little data on the life history or the control of this disease are available. 

 It can be stated that single spore cultures of the fungi from alsike clover 

 and alfalfa have been inoculated successfully onto their respective original 

 suscepts; the disease has been produced in its typical condition; and the 

 pathogenes have been reisolated again. No cross inoculations have been 

 made. 



GIRDLE 



A peculiar girdle disease of alfalfa, red clover, and sweet clover has been 

 found in the State. It appears to be identical with that described and 

 figured by Brown and Gibson (1922) and apparently has not since been 

 reported outside of Arizona, where it originally was found. The writer 

 found it, however, in August, 1929, near Little Rock, Arkansas, on alfalfa 

 (Plant Disease Reporter 13:129. 1929). Diseased plants of all the sus- 

 cepts have the characteristic symptoms of girdle. Leaves on affected stems 

 first turn purplish, later reddish, and finally yellow in color. Stems 

 bearing such leaves are girdled from one to several times by bands of gray- 

 green tissue, bordered on either side by narrow strips of darker colored 

 tissue. Frequently sarcody, or swelling, occurs above the girdle and 

 adventitious roots may begin to grow from the tumid tissues. Apparently 

 no chewing insect is responsible for the injury, because the epidermis over 

 the girdle remains intact. Masses of pink sporodochia of a Fusarium were 

 present on one sweet-clover girdle, but this fungus may have been sapro- 

 phytic. The Arkansas specimen, a portion of which was deposited in the 

 pathological collections at Washington, D. C, shows pycnidia of what 

 appear to be Diplodina medicaginis. 



BACTERIAL LEAF SPOT 



The bacterial leaf spot, caused by Bacterium trifoliorum and described 

 by Jones and others (1923) on various species of Trifolium, was found once 

 on red clover and once on white clover in this State, but it appears to be of 

 little importance. 



FUSARIUM ROOT ROT 



Various unidentified Fusaria have been isolated during the course of 

 these investigations from rotted clover crowns and roots in the State. 

 Neuweiler (1928) states that Fusarium trifolii causes wilt and death of 

 clover plants in Switzerland. Selby and Manns (1909) hold that Fusarium 

 roseum, causing the so-called scab of cereals, is able to attack clover plants 

 in Ohio. Young (1924:63) in the same State isolated many Fusaria from 

 rotted clover roots and after making inoculation experiments he concludes 



