1916] DISEASES OF PLANTS. 249 



The use of lime-sulphur as a summer spray for apple scab, C. C. Vincent 

 (Idaho Sta. Bui. 85 {1916), pp. 16, figs. 5). — The results are given of three years' 

 experiments in the use of lime-sulphur as a summer spray for apple scab. The 

 experiments were carried out on the college orchard to ascertain the value of 

 lime-sulphur as a summer spray for scab and to determine the number of appli- 

 cations needed to hold the disease in check. As a result of the vs^ork, it is 

 claimed that lime-sulphur is an effective remedy for the control of apple scab, 

 good results being secured during wet as well as dry seasons. The cost of three 

 applications was 8.1 cts. per tree. 



In the course of the investigation it was found that different varieties varied 

 in I'esistance to the disease. Grimes Golden is said to be quite resistant, and 

 one application made at the time the buds were showing pink reduced the 

 fungus attack to a negligible quantity. On the other hand, Wagener, Rome, and 

 Jonathan were subject to attack and neither one nor two applications were 

 sufficient to check the disease completely. 



In addition to spraying, the author recommends pruning, cultivation, and 

 fertilization. 



The common diseases of the pear, G. W. Maetin (New Jersey Stas. Circ. 52 

 (1915), pp. 3-12, figs. 6). — The author describes the more common diseases of 

 the pear and gives suggestions for their control. A spray calendar is given, 

 in which time of application, fungicide or insecticide, and the principal causes 

 of injury are indicated. 



Apricot disease in the Rhone Valley, P. Chifflot and Masonnat (Cornpt. 

 Rend. Acad. Agr. France, 1 (1915), No. 15, pp. 473-^77).— The report of this 

 outbreak has already been noted (E. S. R., 35, p. 50). Monilia cinerea and M. 

 laxa have both been claimed to cause the disease. 



Brown rot of prunes and cherries in the Pacific Northwest, C. Beooks and 

 D. F. FisHEK (U. S. Dept. Agr. Bui. 368 (1916), pp. 10, pis. 3).— The authors 

 report upon an investigation of blossom infection and fruit rot of prunes and 

 cherries, both of which diseases are said to have become quite destructive in 

 parts of Oregon and Washington. The investigation indicates that the trouble 

 is due to Sclerotinia cinerea, and spraying experiments have shown the prac- 

 ticability of materially reducing loss from this fungus. The blossom blight 

 was found to be an important factor in the poor set of prune fruit in 1915, and 

 the occurrence of the brown rot on the fruit destroyed a large amount in 

 transit and storage. 



As a result of the work with prunes, it was found that both self-boiled lime 

 sulphur and Bordeaux mixture, when properly applied, give satisfactory control. 

 Four applications are recommended, the first just before the blossoms open, 

 the second after the petals have fallen, the third three or four weeks later, 

 with a fourth about four weeks before harvesting. 



Blossom infection and fruit rot of cherries due to the same cause have been 

 investigated, and while work with cherries has not been carried out so fully 

 as with prunes, it is thought that a treatment similar to that given for prunes 

 would satisfactorily control the diseases. 



Perocid for Peronospora on grapevines, F. Gvozdenovic (Staz. Sper. Agr. 

 Ital., 48 (1915), No. 3, pp. 153-174) .—Fevocid, three forms of which are pre- 

 pared as chemical by-products, is said to have shown a considerable degree of 

 efficiency for the control of grape downy mildew. 



Citrus bark rot, G. H. Zebbst (Philippine Agr. Rev. [English Ed.], 8 (1915), 

 No. 2, pp. 95-97).— It is stated that since 1911 citrus culture has suffered 

 severely from a bark rot occurring over practically the entire province of 



