DISEASES OF PLANTS. 317 



diflereut types of soils. It is expected to publish soon some of the 

 results obtained. Corn smut was also studied, and it was found that 

 the spores are able to iierminate as soon as they mature, in this way 

 rapidly disseminating- the disease. Germination can be largely i)re- 

 vented by spraying the plants with Bordeaux mixture, but the economic 

 phase of the subject remains to be studied. 



The study of potato scab was continued, the results of which were 

 given in Bulletin 50 of the station (E, S. 11., 7, p. 408). Considerable 

 attention has been given the subject of weeds. In this connection it 

 was found that the two seeds in the cockle bur germinate at difiTerent 

 times. The cause of this difterence in the activity of the two seeds is 

 to be given in a future bulletin. 



Report of the botanist, A. D. Selby {Ohio Sta. Bpt. 1895, pp. 

 XXXIY-XLJI, maps ;J). — The work of the i^ast year has been concerned 

 principally with investigations on plant diseases and on weeds. 



The study of peach diseases revealed the presence in the State of 

 peach leaf curl, yellows, fruit spots, peach rot, root or crown gall of 

 peach, and a twig spot, and incidentally the presence of the root aphis 

 {ApMs persicw nujer). A Bordeaux mixture containing 2 lbs. of copper 

 sulphate to 50 gals, of water was found not to injure the peach foliage. 

 In spraying experiments with this solution it was found to be very efiti- 

 cient in combating the brown or i)ustular spot of the fruit. 



The operation of the law relative to black knot and yellows disclosed 

 the distribution of the latter disease, and its spread is shown by a map. 

 Suggestions are offered for the prevention of these diseases and for the 

 better enforcement of the law. 



Investigations on grain smuts were carried on, the results of which 

 were incorporated in Bulletin G4 of the station (E. S. R., 8, p. -5o8). 



The study of weeds was continued throughout the year. In response 

 to the inquiry in Bulletin 59 of the station (E. S. E., 7, p. GOO), relative 

 to occurrence and distribution of weeds, numerous replies and many 

 specimens were received. The occurrence of the more noxious weeds is 

 shown by a map on which is platted the distribution of the Russian 

 thistle, horse nettle, buffalo bur, field peppergrass, pennycress, bracted 

 plantain, spiny amaranth, spiny clot bur, and golden hawkweed. The 

 detailed responses await publication. 



On the appearance of a new potato disease, C. Sa.to (Ztschr. Sjyiritusindnstrie, 19 

 {189G),Xo.JJ,p.2>JJ). 



Observations on combating the heart and dry rot of beets {Xeue Ztuchr. Ihthenz. 

 Ind., 37 {ISDi;), Xo. 1-1, pp. l-'r.-l.-Q). 



Concerning methods for preventing heart and dry rot of beets ( FiiJdhufs landiv, 

 Ztg., 45 (ISOG), Xo. 21, pp. -679-083). 



Sugar cane disease in British Guiana (A>«' Miac Bid. Xo. 113-114, pp. lOG-lOS). — 

 Notes are <rivou of tin; i)resence of the riiicl disease due to Trichospharia sacchari in 

 the region indicated. 



Root molds of sugar cane, J. H. Wakkek (Med. Proefsta. East Jara. n. ser., Xo.SS, 

 pp. 9, ph. ,?). — Notes are given of Cladosporium {Dematium) javanicum u. sp., and 

 Allantospora radicicola. 



