DISEASES OF PI>ANTS, 345 



or iVMiicilliiiiii rot. 'I'lio .•ilTcclcd Iciuoiis nrc easily dislin^cuislioil I'roiii those 

 attacked liy the hhie mold, althou.^di the latter fuii^ius rajiidly follows the other 

 and soon covers the decayin.ix fruit. 'I'he odoi' of the lemons affected hy the 

 lirown rot is characteristic, and (he |icculiar rancid sin(>!l can l»c (|uickly detected 

 hy an experienced person. 



When hrou n lot (irst nia(l(> its apiu-ariincc in p.-ickinu houses, st'arch was 

 made in the oi'chai'd to locate the orii^in of the troul>lc. .-md 'emons showing,' ;i 

 lirowiush discolored are.n on the side or end without any decided softening' of 

 the rind \vere found on the trees. The affected fi-uit keeps its size, shape, and 

 solidity for a considerable time, wheii it usually falls to the .u'round. 



Tender the conditions of lemon jiackins,' this fun.i,'us finds its way into the 

 boxes and spots deNcloji on fruit that are ajiparently sound wiien put away. 

 The diseased fruits are soon involved to.i;ether with all those which lie in eon- 

 tact with them. The trouble never spreads in the mass of stored fruit except 

 by actual <'ontact of the healthy lemon with an .affected spot. When a large 

 .nnount of fruit becomes affected, the characteristic odor is very pronounced. 



A study was made of the fungus and inoculation exix'riments showed that 

 it w.-is the cause of the disease. The investigations of the authors showed that 

 it is a hitherto unrecognized fungus which has relationshi]> with a number of 

 genera. I>oth the genus and species are believed to be new and the organism 

 is described as Puthiacijsils citrophtJiora. 



A bulletin from the California Station on the nature and control of the dis- 

 ease is promised in the near future. 



Revision of the genus Hemileia, (i. Massee {Roy. Bot. Gard. Kcu\ Bui. 

 Mi.sc. I II form.. J9III!. .Yo. .-\ pii. .^')-'/2. itl. 1). — The author calls attention to the 

 lack of information regarding the secidial stages of si)ecies of Ileniileia. and 

 suggests that as there are known to be species of .Ecidium on plants that are 

 i.Iso infested by Hemileia. probably a form of heteroecism exists in this 

 genus, and that the solution of this problem woiUd be of value in attempts 

 to check the ravages of the parasitic form. He notes also that Ilemileia 

 Vdiitdfri.r has been reported as occurring in various regions upon the indigenous 

 .^pecies of ("offea, and he thinks that it is not necessary to assume that the 

 coffee disease has always betMi imjiorted with coffee iilants from one country 

 to another. 



Suggestions are given for the prevention of spread of the disea.se, and mitil the 

 iecidi;il stage is known it is believed that where the nature of the ground and 

 other circumstances permit of spi-aying. 'the use of half-normal strengths of 

 Bordeaux ndxture is advisable. A note is given from an observer in 'fonkin 

 stating that the spread of the disease seems to be checked by the removiil of 

 coffee shade. 



The author gives amended descri]itions of the genera and species, describing 

 4 species of Hemileia. of which //. nixfdiri.r .-ind If. iroadii are known to occur 

 l);irasitically uiion coffee. //. nistntri.r. which is widely ]<nown as exceedingly 

 destructive to coffee, has been rei)orled as occnri-ing in Ceylon. India. China, 

 .lava. Sumatra, Singapore, the Philippine Islands. Samoa. Fiji. M;iuritius, M:ida- 

 gascar. and lunnerous places in Africa. //. ivoodii is indigenous in the 

 southern part of Africa on si)ecies of CofTea and also on sjiecies of Vangueria, 

 while in .lava and Queensland it occurs on gardenias. 



A bihliograi)hy of the more important contributions relating to tlr- Hemileia 

 disease of coffee is aiip(>nded. 



Diseases of coffee with particular reference to Hemileia vastatrix, Buis 

 (Af/r. Pnit. PdiiH Chauds. (! (W06), No. '/.i. pp. 228-2-',!, figs. 2).— Notes are 

 given on the ravages of Hemileia taxintri.v in Ceylon. Madagascar. Reunion, etc., 



