. Fungous diseases of plants, with chapters on physiology, culture methods and technique . tioned the genus Cor-dyceps, including some interesting and striking forms. The major-ity occur upon insects, upon which they are parasitic or species are more or less common parasites of Elaphomyces,a truffle-like, hypogeous genus. ASCOMYCETES 233 XXXII. WILT DISEASE OF COTTON, COWPEA, AND WATERiMELON Neocosmospora vasinfecta (Atkinson) Erw. Smith Atkinson, Geo. F. Some Diseases of Cotton. III. Frenching. Ala. Exp. Sta. Built. 41: 19-29. , W. a. The Wilt Disease of Cotton and i
. Fungous diseases of plants, with chapters on physiology, culture methods and technique . tioned the genus Cor-dyceps, including some interesting and striking forms. The major-ity occur upon insects, upon which they are parasitic or species are more or less common parasites of Elaphomyces,a truffle-like, hypogeous genus. ASCOMYCETES 233 XXXII. WILT DISEASE OF COTTON, COWPEA, AND WATERiMELON Neocosmospora vasinfecta (Atkinson) Erw. Smith Atkinson, Geo. F. Some Diseases of Cotton. III. Frenching. Ala. Exp. Sta. Built. 41: 19-29. , W. a. The Wilt Disease of Cotton and its Control. Div. Veg. Phys. and Path., U. S. Dept. Agl. Built. 27: 1-16. pis. 1-14. , W. a. The Wilt Disease of the Cowpea and its Control. Bureau of Plant Industry, U. S. Dept. Agl. Built. 17: 1-20. ph. 1-4. , Erw. F. Wilt Disease of Cotton, Watermelon, and Cowpea. Div. Veg. Phys. and Path., U. S. Dept. Agl. Built. 17 : 1-53. pis. i-io. 1899. This is a fungous disease which has become prominent onlyduring the past fifteen years, and it is already a serious foe. The. Fig. 96. Effects of the Cotton Wilt Fungus in a Field of Non-resistant Cotton. (Photograph by W. A. Orton) fungus has been studied extensively both in its general biologicaland also in its cultural relationships, but it is not yet certain thatthe forms on the different host plants are properly referable to thesame species. If so, however, it would ceitainly seem that thesehosts have caused at least a racial variation in the parasite. Distribution. The wilt disease of cotton is now known to beone of the most destructive parasitic diseases of this crop, and itis probable that the fungus is distributed practically throughout 2 34 FUNGOUS DISEASES OF PLANTS the cotton-growing states. It has, however, been found as a mostserious malady in portions of South Carohna, particularly on thesea islands, also in many localities of Georgia, Alabama, andLouisiana. It exists also to less extent in other souther
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