256 EXPERIMENT STATION RECORD. 



ture which is essentially the same as the second mixture just described. 

 The results obtained from a series of 20 plats showing- the comparative 

 value of the different forms of Bordeaux mixture were decidedly in 

 favor of the standard mixture. Tests were also made of 2 commercial 

 powders, Bug' Death and Laurel Green, as substitutes for Paris green 

 and Bordeaux mixture for use upon potatoes. The primary object 

 was to determine whether these compounds had any value as fungicides, 

 but the absence of all fungi rendered this portion of the experiment 

 of no value. It was found that both the powders possessed consid- 

 erable value as insecticides, although no comparison can ])e drawn 

 with Paris green on account of the diti'erence in the experiments. 



A ne-w phoma disease of s^vedes, M. C. Potter {Jour. Bd. Agr. 

 [Lojidon], G {1900), No. 4, pP- J^Jv^-^^O, jd. i, figs. 5). — A description 

 is given of a somewhat common disease of swedes which occurs in the 

 north of England and. according to the author, appears to have been 

 thus far undescribed. When fairlv advanced the disease is usually 

 recognized by pale, straw-colored, or brownish patches which con- 

 trast strongly with the ordinary color of the root, and by the large 

 dry cracks which sometimes penetrate deeply into the flesh. The 

 natural color of the swede is destroyed and replaced by discolored 

 patches which are surrounded by a narrow border of dark metallic 

 green, shading into a dark purple. Numerous small spots of a deep 

 purplish green color, encircling a central lighter spot, indicates the 

 commencement of the disease. One striking characteristic of the dis- 

 ease is the dr}^ condition of the attacked cells, the cortex usually sep- 

 arating as a dry paper}^ layer. The microscopical appearances of the 

 fungus are described at considerable length and results of cultures are 

 given in which the complete cycle of the fungus was carried out upon 

 swedes. In general appearance the fungus agrees very closely with 

 the description given of Phoma hrasslcw, which is said to attack cab- 

 bages in the west of France. It possesses other characters which have 

 been given for ]\ sangidnolenta, which is said to attack carrots, and 

 the author thinks eventually these difl'erent parasites will be found to 

 be forms of the same species. 



Suggestions are given for methods of combating the disease. At 

 present the only means seems to be remedial and consists in the de- 

 struction of all infested roots and greater attention to storage and 

 fertilizers. 



Tomato blight, (1. \\ . Herrick {Jf/s.sissijjpl /Stct. I?j)t. 1899, pjj. ^, 

 44)- — T'l order to ol)tain some practical method of dealing with tomato 

 Ijlight, the author conducted a number of experiments during the sea- 

 son covered by the report. Seedlings were grown on infected soil 

 and kept in the greenhouse where similar plants had been grown every 

 year. Etjual areas were planted in soils which had produced ])lighted 

 tomatoes the year previous. One plat was treated with lime at the 



