152 Mortier F. Barrus 



No continued efforts have been made, so far as the writer is aware, 

 to render susceptible bean plants immune to anthracnose by the absorption 

 of toxic substances, as has been attempted with some other plants. The 

 writer has endeavored to obtain a greater degree of susceptibility in bean 

 plants showing considerable resistance to one of the strains of Colletotri- 

 chum lindemuthianum. Such plants, while yet seedlings, were, just previous 

 to inoculation, (a) kept growing in very dry soil for two weeks, (b) kept 

 in very wet soil for two weeks, (c) injured in various ways. In no case 

 was a greater degree of infection obtained than on plants not so treated. 

 Schaffnit (1920) remarks that a weak condition of plants such as comes 

 from a sudden check in growth, as during a sudden fall in temperature, 

 makes them especially susceptible. 



Susceptibility of other species of the genus Phaseolus to infection 



The statement has sometimes been made that varieties of Phaseolus 

 vulgaris only are susceptible to attack by Colletotrichum lindemuthianum. 

 Massee (1898), however, reports the disease as most common on French 

 beans (Phaseolus vulgaris) and on Scarlet Runner (P. multiflorus) , and 

 a few other writers on the subject have recorded it as being severe or as 

 occurring on Scarlet Runner ( P. multiflorus) , possibly quoting from Massee 

 (Saccardo 1898, Collinge 1911, Lincl 1913). Allescher and Schnabl (1893) 

 distributed specimens of Gloeosporium lindemuthianum on leaves of Phase- 

 olus multiflorus. Lakon (1916) says that P. multiflorus is practically 

 resistant to rust and above all to anthracnose. Schenk (1917) also says 

 that, although the disease is reported as occurring on Feuerbohnen ( P. mul- 

 tiflorus) in Holland, he has observed this species to be very resistant when 

 other varieties were badly affected. Fischer (1919:258) saw nothing of the 

 disease worth mentioning on three varieties of P. multiflorus — albiflorus 

 Lam., coccineus Lam., and bicolor Arrabida — while pole beans of P. vulgaris 

 growing next to them were badly affected. Edgerton (1910:41) reports 

 a slight infection of lima beans (Phaseolus lunatus var. Small White Pole), 

 and later (with Moreland, 1916:8) good infection on Fordhook's Bush 

 L'ma, very slight infection on Large White Kidney, and no infection on 

 Scarlet Runner when inoculated with spores of Colletotrichum lindemuth- 

 ianum. Lind (1913) records the disease on pods, stems, and leaves of 

 Phaseolus vulgaris, P. compressus, P. nanus, and P. multiflorus. The 



