DISEASES OF PLANTS. 843 



I;ir uttentioii beiiis sivoii to tho occ-urrence of a raco of this spocios which does 

 not ai)i)ear to be infested 1).v the funj.'iis to which the poisonous properties of 

 darnel are attributed. 



Selection for disease-resistant clover, S. M. Bain and S. II. Essary 

 iTcinicxscc Sta. JiiiL, Vol. XfX, No. 1, pp. 10, figs. 5).— In carryins; on their 

 investigations with clover anthracnose (GolletntricliKiii trifoHi), a preliminary 

 report of which has already been siven (E. S. K.. 17. p. ."(IT), the authors found 

 tliat in some badly infected fields there were here and there individual plants 

 that possessed a hi.uh det^ree of resistance. With this fact in mind, a series of 

 exjieriments was planned to develop a resistant strain of clover, and a jirelimi- 

 nary report is siveu of the results thus far obtained. 



In one of the experiments a plat was planted with seed from resistant plants 

 obtained from different sources, and comparisons made with ordinary commer- 

 cial seed grown under siniil.ir condilions. After seeding the plats they were 

 covered with infected hay in ordt!r to insure the presence of the disease among 

 the selected plants. Toward the close of the season 95 per cent of the seedlings 

 from the resistant plants were alive, while not more than .') per cent from the 

 nonselected jtlants had survived the disease. 



The investigations thus far carried on indicate that there is a strong resist- 

 ance on the part of some plants toward this disease. This fact has been taken 

 advantage of as raiiidly as possible, but as y^t no seed is available for 

 distribution. 



Spraying potatoes, E. J. Butler {Agr. Jour. India, 2 {1'.)()1), No. 1, pp. 

 P'i, 96). — An account is given of potato spraying experiments in which 3 

 I'lats were spra.ved in duplicate with Bordeaux mixture. One plat was sjirayed 

 with ])lain Bordeaux mixture, the second with Bordeaux mixture to which a 

 small ([uantity of resin-soda solution was added, and the third with Bordeaux 

 mixture containing unrefined sugar. The quantity of Bordeaux mixture used 

 was at the rate of about .'500 gal. per acre, GO gal. being applied at the first 

 application and 120 gal. at each of the other applications. 



T1h> yield of the different plats is shown, from wlii.-h it a])j)ears that the 

 spraying resulted in a substantial profit. The largest returns were obtained 

 from the plats spra.ved with Bordeaux mixture to which resin and soda were 

 added, followed by P>ordpaux mixture containing sugar, and plain Bordeaux. 



Some elements of plant pathology, N. A. Cobb (Havalian tiugttr I'Janters' 

 ^ta., Div. Path, and Physiol. Bill. //, pp. 50, figs. 32). — This is an address on the 

 (■.iseases of plants especially related to sugar cane delivered by the author before 

 the annual meeting of the Hawaiian Sugar Planters' Association. 



Fungus maladies of the sugar cane, N. A. Cokr ( nawaiian Sugar I'laiitrrs' 

 Sta., Div. Path, and Phij!<ii>l. liiih .',, pp. 2r,i,. pis. N, figs. 102).— \ report is 

 given on investigations of a number of diseases of sugar cane, together with 

 notes on associated insects and nematodes. Among the diseases described are 

 root diseases, leaf-splitting blight, rind disease, pineaiijde disease, ;in(l a disease 

 to which the name "eleau " is given. 



The iirincipal root disease described is that due to the basidicmiycetous 

 fungus Itligphiilliis coralloidcs n. sp. This disease is estimated to cause in 

 some districts losses amounting \n Ui per cent of the I'attoun crop, with somewhat 

 less on fields of plant cane. Tlie lungus, which is almost entirely a subter- 

 raueau one, ouly coming to the smMace of the ground when the fructifications 

 are formed, attacks the cane through woiuids and tli(> cut ends of the plant 

 c:uie, from which it sjireads along the fibrovascniar bundles into the interior 

 of the iilant. It was found that flies jilay an imi)ortant part in spreading the 

 spores of the fungus, and extended studi(>s were made on the role of flies 

 and other insects in the dissemination of this disease. In addition to the 



