752 EXPERIMENT STATION RECORD, 



A canker of apple trees caused by the brown rot fungus, E. S. Salmon 

 {Jour. SoutJicast. Agr. Col. Wye, 1910, No. t!), pp. 3.15-3.'>7, ph. <>). — Previously 

 noted from another source (E. S. R., 23, p. 548). 



Sooty blotch: A new fungus disease of apples, E. S. Salmon (Jour. South- 

 east. Agr. Col. Wye, 1910, No. 19, pp. 351-35.'i, pi. I). — Previously noted from 

 another source (E. S. R.. 24, p. 450). 



An uncommon disease of plum trees, F. T. Brooks (Gard. Chron., 3. ser., If9 

 {1911), No. 1276, p. 377,).— Attention is called to the killing of Rivers Early 

 plum trees in England by DermatcUa prunastri, a fungus which usually lives as 

 a parasite only on the smaller branches of Greengage plum trees, causing a liind 

 of die-back. In this instance it had attacked the larger branches and even the 

 trunks of the trees. 



Peach freckle or black spot, I. B. P. Evans {Agr. Jour. Union 8o. Africa, 1 

 {1911), No. 5, p. 696, pi. 1). — The author reports the prevalence of black spot 

 {Cladosporium carpophUum), especially on peaches, describes the general symp- 

 toms of this disease, and gives the remetlies to be used in combating it. Three 

 applications of Bordeaux mixture are recommended as the most effective treat- 

 ment for the disease, the first application (5:5:45) 3 weeks before the buds 

 begin to open, the second (4:4: 300) just after the fruit is set, and the third 

 (4:4: 100) when the fruit is about half grown. 



A leaf spot of the olive and curculio on almonds and peaches, B. V. Ramos 

 {Bol. Agr. T6c. y Econ., 3 {1911), No. 30, pp. 500-504).— Attention is called to a 

 serious attack of leaf spot on the olive, caused by the fungus Cycloconinm 

 olcaginum, and of curculio on almonds and pea dies. 



Report of the pathologist, G. L. Fawcett {Porto Rieo Sta. Rpt. 1910, pp. 35, 

 36). — This report includes discussions of diseases of coffee and pineapples, and 

 miscellaneous diseases. 



The leaf blight of coffee caused by Pellicularia liolrroga has been studied, 

 special attention being given to its life history. No ascigerous stage was found, 

 nor any evidence of propagation by spores. A slow but effective spread was 

 found to occur by the dropping of the leaves carrying the mycelium, or their 

 transportation by the wind to healthy trees, each infested leaf being a source 

 of infection. During dry weather the fungus ceases to grow, gradually dries up, 

 and falls away, but small fragments remain attached to the trees and from 

 these a new growth develops when sufficient moisture is available. At the close 

 of periods of drought is, therefore, the time when spraying can be made most 

 effective. In spraying experiments with various fungicides Bordeaux mixture 

 was found to be the best, owing to its adhering better to the foliage. Spraying, 

 careful pruning, and avoidance of too close plantings promise to control this 

 disease effectively. 



A so-called root disease of coffee is noted, in which the trees are killed by 

 being girdled just below the surface of the soil. At first the diseased area is 

 small, but it gradually and slowly spreads. The trouble seems to be produced 

 by the piling up of earth about the base of the trees and by the accumulation of 

 masses of decaying vegetable matter. 



The spot of leaf and fruit caused by Stilbuin flavidum is said to be a serious 

 disease of coffee, but is restricted to a limited area of extreme humidity. The 

 life history of the organism has been studied and experiments for its control 

 are begun. 



It is stated that the cultivation of pineapples in clay soils in some of the more 

 humid regions is attended with uncertain results, as the plants during the 

 second and third year become yellow and fail to resix)nd to fertilizers. The 

 roots of such plants are found to be decayed. 



A Fusarium disease of bananas is also noted. 



