512 



The Ohio Naturalist. 



[Vol. VI, No. 6, 



losa.^'* A critical examination of the species of Leguminosae 

 grown at the station in 1904 and 1905, showed all of these to be 

 free. Following are the results from the various Leguminosae 

 grown on the Station variety plots in 1904 and 1905: 



Host. 



Hairy Vetch 



vSpring Vetch 



White Lupine 



Lentils 



Grass Peas 



French June Peas 



Scotch Gray Peas 



Velvet Beans 



Horse Beans 



Medium Green Soy Beans. . . 

 Mammoth Yellow Soy Beans 



Beggar Weed 



Yellow Lupine 



Flat Peas 



Alfalfa 



Egyptian Peas 



Russian Blue Peas 



Examined 

 July 22, 1904. 



Free 



Slightly on leaves. 

 Free 



Very bad 



Slightly on leaves. 

 Free 



( i 



* 



Free 



Examined 

 July 28, 1905. 



Free. 



*. . . . 



* . . . . 



Free. 



Very bad. 



On leaves and stems 



*. . . . 



Free. 



*. . . . 



*. . . . 



Free. 



No planting.* 



Climate certainly determines largely the seriousness of at- 

 tacks by this fungus. For example, Lochhead'^ describes a ser- 

 ious outbreak on Egyptian-peas in Ontario in 1903. Yet, while 

 we have experienced an exceptional attack by the fungus during 

 1904 and 1905, Egyptian-peas have proved to be entirely free of 

 the disease. Excessive moisture during these two years, is 

 doubtless the chief factor in this outbreak. Added to this, is 

 the continual growing of peas on the same ground. When peas 

 have been planted on the same soil for two or more successive 

 years, the loss may be considerable, even in ordinary, seasons. 

 Two years rotation in other crops, relieves the land of the trouble 

 for the time at least, showing that the fungus lives over in the 

 soil or compost as well as in seed peas. 



Previous outbreaks have been reported. Krueger''' states 

 that in one place, the cultivated field crop was a complete failure 

 in 1S94. Combes'' reports it as attacking pea stems so seriously 

 as to cause a wilting of the tops, in 1879. 



14. Ducomet, Prog. Agr. et Vit. (EdL'est) 22 (1901) No. 34, pp. 225-233. 



15. Lochhead, 1. c, p. 26. 



16. KrucRcr, 1. c, p, 621. 



17. Combes, Crittogamia agraria, p. 473. 



Botanical Laboratory, Ohio Agricultural Experiment Station, 

 November 23rd, 1905. 



