DISEASES OF PLANTS. 55 



obtain entrance at points of injury due to various causes. Cutting out and disin- 

 fecting the diseased area, where this is not too extensive, has proved successful. 



Blig'ht resistant pear stocks, G. Compere (Mo. Bui. Com. Hort. Cal., 4 

 (1915), No. 7, pp. 313, 314, figs. 2).— Referring to a report by Reimer (E. S. R., 

 33, p. 53), the author states that a tree grown from seed of a Chinese wild pear 

 sent over by himself in 190S is producing fruit and is not attacked by either the 

 pear blight or the woolly aphis, both of which attack severely contiguous trees 

 grown on common stock. 



Wilting of raspberry and loganberry canes, H. Wobmald (Jour. Southeast. 

 Agr. Col. Wye, No. 22 (1913), pp. J^1J^-J^S2, pis. 3, figs. 4). — A descriptive dis- 

 cussion is given of four fungi found in wilted canes examined, namely, Hender- 

 sonia rubi, Didijmella applanata, Coniothyrium fuckelii, and Gnomonia rubi. A 

 Fusarium has been noted as possibly parasitic on the roots of raspberry. It is 

 considered to be the conidial stage of Nectria rubi. 



Withertip of coffee (Mem. Fomento [Costa Rica-I, 1913, pp. 380, 381). — A 

 partial or total drying iip of twigs in exposed parts of coffee trees is noted as 

 causing losses in portions of Costa Rica. Causes assigned by several writers 

 include various fungi named, cold dry winds, and unfavorable physiological 

 conditions. 



Heterodera radicicola, G. Bondak (Bol. Agr. [Sao Paulo], 16. ser.. No. 4 

 (1915), pp. 329, 330). — Observations made by the author are cited in support 

 of the view that //. radicicola does not attack coffee trees under normal con- 

 ditions. 



Red rust of tea, C. Bernard (Dept. Landb., Nijv. en Handel [Dutch East 

 Indies], Meded. Procfstat. Thee, No. 32 (1914), PP- 1-20).— This discussion 

 appears to be preliminary to a somewhat fundamental study of red rust of tea 

 plants, said to be increasingly injurious recently in Java. 



The disease is due to Cephaleuros virescens, long known in this region as 

 readily attacking tea plants subjected to unfavorable conditions, some of which 

 are here discussed. Fungicides appear to be relatively ineffective in controlling 

 this trouble. 



The control of koleroga of the areca palm, L. C. Coleman (Agr. Jour. 

 India, 10 (1915), No. 2, pp. 129-136). — This is a brief account of the work now 

 in progress in connection with the koleroga disease of areca palm due to Phy- 

 tophthora omnivora arecce, in relation to the conditions peculiar to the region 

 indicated, within which this disease is prevalent. 



The fungicide used was Bordeaux mixture of double strength, to which had 

 been added an adhesive mixture of resin dissolved by heating with soda in water. 

 The finished mixture showed remarkable adhesive qualities considering the 

 torrential rains prevailing there during part of the year. A special type of 

 spray adapted to the nature of the work has been employed. These protective 

 measures are being widely tested out. 



Experiments are now in progress with a view to stamping out the disease 

 entirely, and one area where the rainfall is about 300 in. annually has been kept 

 clear during the past three years. 



A disease of coconut in New Caledonia, R. H. Compton and P. D. Montague 

 (Rev. Agr. Nouvelle-CaUdonie, No. 44 (1914), pp. 29-33). — A brief preliminary 

 discussion is given of a disease affecting flowers, leaves, fruit, trunk, and roots 

 of coconut in New Caledonia. The cause is said to be a fungus, the identity 

 of which has not yet been settled. In its vegetative phase it ramifies widely in 

 the tissues, the fructifications forming externally and producing a vast number 

 of spores. Infection may occur by means of these or by contact of sound with 

 diseased tissue. Sanitary measures are suggested. 



15419°— No. 1—16 5 



