346 EXPERIMENT STATION RECORD. 



or less extent, but American upland varieties growing around the edge of the 

 infected plats were not attacked, nor was any instance found in which the 

 American cotton was suffering from the disease. 



Upon an extended inquiiy it was found that this disease had been noticed 

 occasionally for the past 3 or 4 years, but only became serious during 1907. 

 All replies to inquiries indicated that only the Indian varieties were attacked. 



The presence in Germany of Pseudoperonospora cubensis tweriensis, a 

 parasite of cucurbits, R. Ewert (Internat. Phytopath. Dienst {Bciyuhe Ztschr. 

 Pflan.:cnkrank.), 1 (1908), No. 1, pp. 8-11). — The author reports the presence 

 In several localities in Germany of a form of the cucurbit mildew, which was 

 described a few years since by Rostowzew as occurring in Russia. This form 

 of the mildew differs from the species in the larger size of the conidia. 



Leaf spot disease of eg'gplants, P. Yoglino i2Ialpighia, 21 {1901), No. 7-8, 

 pp. 353-363, pJ. 1). — The author claims that the form of leaf spot, to which the 

 name fumagine is sometimes given and which has been variously reported as 

 caused by Phoma soJani and Phyllosticta hortoruin, should be refen*ed to 

 Ascocliyta hortorion. To this species should also be referred Ascochyta lycoper- 

 sici, A. soJanicoIa, A. atropce, A. aJkekengi, A. pliysalicola, and possibly A. 

 pinzolensis. 



The spores of A. hortorum germinate readily in moisture on the leaves of the 

 eggplant, tomato, other species of Solanum, such as S. nigrum and S. dulcamara, 

 and on Physalis alkekengi. Datura metal, and Atropa heUadonna. 



In their morphological characters there is a close agreement between A. 

 hortorum and A. pisi, but from inoculation experiments they seem to be biologi- 

 cally distinct. 



Potato spraying' experiments, L. R. Jones and N. J. Giddings {Vermont 8ta. 

 Rpt. 1901, pp. 33-'t-3-'i,2). — Experimental trials with fungicides upon potatoes 

 have been carried on at the station for the past 17 years. Those in 1907 were 

 designed particularly to determine the I'elative gain from spraying potatoes 

 with Bordeaux mixture and Paris green, comparing the results from 2, 3, and 

 4 applications, and the relative gains from the use of commercial compounds, 

 such as Boxal and Bug Death, as compared with Bordeaux mixture and with 

 Paris green. 



The experiments with 2, 3, and 4 applications of Bordeaux mixture and 

 Paris green gave results that were in the main in harmony with those obtained 

 in previous years' investigations. The 2 applications of Bordeaux mixture 

 made in August proved less efficient in checking the flea beetle and early blight 

 than where other applications were made, particularly the spraying made 

 early in July. The increase in marketable tubers for the sprayed over the 

 unsprayed lots varied from 52 to 172 per cent. 



In experiments in spraying late potatoes with Bordeaux mixture the results 

 were similar, although the season was apparently not one in which large 

 crops were obtained. A tabulation is given showing the average gains due to 

 spraying obtained for the last 17 years as 113 bu., or 68 per cent increase per 

 acre. 



The experiments to test the value of Boxal and Bug Death, showed that 

 neither was any improvement over a freshly prepared Bordeaux mixture to 

 which Paris green was added. Both the proprietary compounds had insecticidal 

 and fungicidal value, but they were more costly and less efficient than the 

 Bordeaux mixture. 



A new tomato disease, H. T. Gtissow (.Jour. Bd. Agr. [London], 15 (1908), 

 2Vo. 2, pp. 111-115, fig. 1). — An account is given of a disease of tomatoes caused 

 by Septoria lycopersici, which luitil 1907 had been unreported in England. 

 During that year the entire crop was destroyed in one of the principal tomato 

 districts of England. 



