DISEASES OF PLANTS. 909 



is due to Ploicriglitia morhosa, was first troublesome in tbe eastern 

 part of the United States, and it has spread westward throngli the 

 introduction of diseased plants from the East. The life history of tlie 

 fungus is given in considerable detail and various remedial treatments 

 suggested. In 1893 some experiments were begun at the station for 

 the prevention of the disease. A thicket of Morello cherry trees and 

 sprouts was taken for the experiment, and 5 api)lications of Bordeaux 

 mixture made in that year. In 1894, after 1 application of the fungi- 

 cide, all the knots were cut out and counted on the treated and 

 untreated portions of the plat. During this year 8 applications of 

 Bordeaux mixture were made, and on November 2G the new knots were 

 removed from both the sprayed and unspraj^ed portions. On April 

 25 the knots removed from the unsprayed portion were 2,002; the 

 sprayed, 1,155. On November 26 the number of knots removed from 

 the unsprayed portion was 3,529, of which 3,4CG were new knots ; from 

 the sprayed portion 240 knots were removed, of which 1G5 were new, 

 showing that the application of the fungicide had materially decreased 

 the disease. 



The author recommends the following treatment: Spray (1) during 

 the latter part of March or early in April, (2) when the buds begin to 

 swell, (3) as soon as the new knots begin to show their velvet coating, 

 (4) at intervals of 2 or 3 weeks as may seem necessary. 



As some of the applications for the control of black knot are made 

 at a time when other diseases require treatment, but little extra labor 

 is involved in the spraying for the prevention of knots. The author 

 thinks that the spraying of plums and cherries to protect them from 

 the black knot fungus can be carried on with profit in all sections 

 where this disease threatens to interfere seriously with the profitable 

 cultivation of these fruits. A bibliography of the black knot litera- 

 ture is included in the bulletin. 



A.ureobasidium vitis, G. de Lamarliere {Bev. Myeol., 17 {1895), No. 2, pp. 

 54-56). — A review of recent literature, witli critical notes. 



Notes on Fusicoccum abietinum, R. Feury {Rev. Mycol., 17 {1895), No. 1, p. 25). 



Recent observations on the external characters of black knot, G. Lavergne 

 and E. Markk {Eev. Fit., 2 {1894), p. 498). 



Recent investigations on the common mold (Penicillium glaucum), Elfving 

 {Bot. Cetitbl., 61 {1895), p. 154). 



The cherry fruit mold, B, D. Halsted {Garden and Forest, 8 {1895), pp. 137, 138).— 

 A brief description is given of Man ilia fructigena and its attack on cherries, plums, 

 and peaches. 



Some new or little kno'wn fungi of cultivated plants, Prillieux and Dela- 

 croix {Bui. Soc. .Vycol. France, 1894, p. 161). — Notes are given of Septoria iietroselini 

 apii on celery, CoUetotrichum oUgochctium on melons, Macrophoma vestita on the roots 

 of TJieoiroma cacao, and Fusnritim sarcochroum on ailanthus. 



New German grain fungi, B. Frank {Ber. deut. bot. Ges., 13 {1895), No. 2, pp. 

 61-65). — Critical notes are given of Lepiospliceria herpotricJioides, L. triiici, SpJiwreJla 

 hasicola, n. sp., Ophiobolus Iterpotriclnis, Septoria exitialis, S. graminum, S. glumarum, S 

 briosiana, S. arena, n, sp., Ascochyta graminicola, and Phoma hennebergii, 

 17034— No. 10 5 



