. Bulletin of the Department of Agriculture. Agriculture; Agriculture. JfW^^UY. BULLETIN No. 828 Contribution from the Bureau of Plant Industry WM. A. TAYLOR, Chief. Washington, D. C. PROFESSIONAL PAPER May 10, 1920 BACTERIAL WILT OF CUCURBITS. By Frederick V. Rand, Assistant Pathologist, and Ella M. A. Enlows, formerly Assistant Pathologist, Laboratory of Plant Pathology. CONT Page. 1 2 16 cucumber 21 ENTS. Page. 25 31 34 Relation of the wilt bacteria to beetles Control Summary 36 41 FORE^ VORD. The studies of the writers on bacterial wilt of cucurbits (caused by Bacillus tracJieiphilus
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. JfW^^UY. BULLETIN No. 828 Contribution from the Bureau of Plant Industry WM. A. TAYLOR, Chief. Washington, D. C. PROFESSIONAL PAPER May 10, 1920 BACTERIAL WILT OF CUCURBITS. By Frederick V. Rand, Assistant Pathologist, and Ella M. A. Enlows, formerly Assistant Pathologist, Laboratory of Plant Pathology. CONT Page. 1 2 16 cucumber 21 ENTS. Page. 25 31 34 Relation of the wilt bacteria to beetles Control Summary 36 41 FORE^ VORD. The studies of the writers on bacterial wilt of cucurbits (caused by Bacillus tracJieiphilus Erwin F. Smith), published in 1915 and in the spring of 1916, have been continued during the past three seasons. The previously published work1 demonstrated that the striped cu- cumber beetle (DiabroticavittataFah.) and also the 12-spotted cucumber beetle (]iv.) are the most active and probably the only summer carriers of this bacterial wilt in the localities investi- gated. Some evidence was given that the striped cucumber beetle may be also a winter It was shown that the soil had no relation to the disease either as a source of early spring or of summer infection. Seed from wilted plants in all oases failed to transmit the disease, and all attempts at infection through the stomata gave negative results. A fair degree of control was obtained by early treatments with Bordeaux mixture and lead arsenate combined, and it was shown that this control was related not only to the repellent and insecticidal qualities of the mixture, but also to a direct bacte- ricidal action upon the wilt organism. The present paper deals with further studies of the relation of soil and insects to the distribution and control of the disease, and includes also a portion of our work with the causal organism itself. 1 Rand, F. V. Dissemination of bacterial wilt of cucurbits. (Preliminary note.) In Jour. Agr. Re- search, v. 5, no. 6, p. 257-260, pi. 24. 1915. Rand, F. V., and E
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