648 EXPERIMENT STATION EECORD. 



a source of much loss. The causal fungus, S. cassavw, is a typical wound 

 parasite, attacking only, so far as yet observed, the cut surface of the slip 

 which is above ground. It is said to be controlled by an early application of 

 tar to such portions. 



The description of the fungus shows an instance of spore formation within 

 certain cells or sections of the mycelial threads. Such swollen and spore- 

 bearing portions are regarded as asci, and several forms are noted. Pycnidia 

 and pycnospores are also described. 



Two physiological affections of Sea Island cotton in the West Indies, 

 W. NowELL {West Indian Bui., I4 (1914), No. 4, pp. S04-317, pis. S).— Descrip- 

 tions are given of curly leaf and loggerhead of cotton in the West Indies. 

 These are supposedly distinct physiological diseases, having been known in 

 this region since about 1910. 



Curly leaf appears to be related in some way with rapid growth, resulting 

 from abundant water supply in still, cloudy weather, shade, and crowding, in 

 connection with certain soil conditions, including depth and easy permeability. 

 Loggerhead disease is very erratic in its occurrence, and its relation to weather 

 conditions is not quite clear. 



The incidence of either disease in any year is strictly local, cases of severe 

 damage being rare and of limited extent. Neither disease appears to be 

 increasing or to be connected with any particular kind of seed, and no remedial 

 measures are known or suggested. 



A bibliography is given. 



Cruciferous club root and gall weevil injury, O. Schlumbeegeb {Deut. 

 Lanclw. Presse, 4I il9U),No. 83, pp. 910, 911, pi. 1, figs. S).— This is a discussion 

 of the appearance and effects df slime mold (Plasmodioplioru hrassicce) on 

 crucifers as contrasted with injury due to gall weevils, which somewhat resem- 

 bles it externally. 



Rheosporangium aphanidennatus, a new genus and species of fungus 

 parasitic on sugar beets and radishes, H. A. Edson {TJ. S. Dept. Agr., Jour. 

 Agr. Research, J^ {1915), No. 4. PP- 279-291, pis. 5). — In a previous publication 

 (E. S. R., 29, p. 646) tlie author called attention to this disease and later has 

 given a description of its pathogenic properties (E. S. R., 33, p. 246). 



The present paper deals with studies on the morphology, cytology, and tax- 

 onomy of the organism which has been described as R. aphanidermatus n. g., 

 and n. sp. 



Apple spraying experiments in 1914, W. J. Morse and M. Shapovalov 

 {Maine Sta. Bui. 24O {1915), pp. 177-196). — In continuation of experiments in 

 apple spraying (E. S. R.. 31, p. 151), the authors give an account of the results 

 of their investigations in 1914. 



A series of plats embracing 282 Ben Davis apple trees was sprayed with 

 different fungicides to determine their relative eflBciency for the control of 

 apple scab, and also for their effect upon the foliage and fruit of the trees. 

 Different plats of trees were sprayed with Bordeaux mixture, lime sulphur, 

 " soluble sulphur," " atomic sulphur," copper lime sulphur, extra fine sulphur, 

 and arsenate of lead, arsenate of lead being added as an insecticide to the 

 different fungicides. Notes were taken of the effect of the various sprays on 

 the foliage and fruit during the summer, and when the fruit was gathered the 

 different lots were examined for the percentage of scabbed and russeted fruit. 



Bordeaux mixture showed the greatest efficiency in scab control, but it also 

 resulted in the largest amount of russeted fruit. Different dilutious of lime 

 sulphur proved satisfactory, and as a result of thiee seasons' work it is con- 

 cluded that the strength of this solution can be increased about 20 per cent 



