550 EXPERIMENT STATION RECORD, 



For the control of these diseases, the author recommends the renovation of 

 the cranberry bog, careful attention to water supply, and the cultivation of 

 hardy and disease-resistant varieties. Experiments have shown that Bordeaux 

 mixture is efficient in controlling the disease, particularly if it has added to it 

 a resin-fishoil soap mixtui'e, which makes it cover and adhere to the plants 

 better. Five applications of this fungicide can be made at a cost of .$15 to 

 $20 iJer acre. 



Some coffee parasites in St. Thomas, C. Gravieb (BiiI. Mus. Xat. Hist. Nat. 

 [Paris], 1907. No. 4, pp. 266-269).— On the island of St. Thomas, west coast of 

 Africa, the coffee trees are said to be attacked by a number of parasites. De- 

 scriptions are given of a beetle, the larvfe of which attack the stems of the 

 coffee tree; some fungus diseases of the leaves, the principal of which is the 

 conidial form of ToniJa sphwrella, which causes the sooty mold or fumagine; 

 a I'oot rot of the trees, and attacks of termites. 



The principal diseases of forest trees, L. Pechon {BiiL Soc. Cent. Forest. 

 BeJg., IJf {1907), Xos. 6, pp. 32-'t-S32; 7, pp. 39S-iOS. pis. 2, figs. o).—X rather 

 brief compilation is given describing the principal fungus diseases of coniferous 

 and deciduous forest trees. Suggestions are made for combating these diseases 

 in the seed bed. nursery, and foi-est. 



Sap rot and other diseases of the red gum, H. Von Schrenk (U. S. Dept. 

 Agr., Bur. Plant Indus. Bui. 114, PP- ^~. P^-^- S)- — After a brief description of 

 some of the diseases to which the living red-gum tree is sul^ect, an extended 

 account is given of a sap rot of the tree when cut into logs. 



This disease, which is caused by Polyporus adustus, develops with consider- 

 able rapidity, the fungus gaining entrance through the ends of the logs. The 

 fungus was found to completely destroy the sapwood of a large log within a 

 year if the logs were permitted to lie in the woods or along stream banks, as 

 is the usual practice. 



Sap rot may be prevented by shortening the drying period in the woods, 

 either by hauling the logs by rail or by reducing the moisture in the log. The 

 reduction of the moisture may be secured to a considerable degree by felling 

 the trees without sawing them into logs and leaving them in the forest until 

 the leaves are thoroughly di'y. The sap rot may likewise be almost entirely 

 prevented by coating the ends with hot coal-tar creosote inmiediately after the 

 logs are cut. This treatment can be made at an expense of about 8 cts. per 

 1,000 ft. B. M. Wherever possible, all freshly cut logs, particularly those cut 

 during the spring and summer mouths, should have the bark peeled off. 



In addition to the above, sap rots of red gum may be caused by the fungi 

 Polystictus hirsutus and Porta suhacida. A number of other species of fungi 

 attack the sapwood, but they are of minor importance. An attack of the heart- 

 wood of the red gum. due to Lcnzitcs vialis is briefly described, and in addition 

 Polyporus lactcus and an undescribed species of Trametes are said to attack 

 the heartwood. 



Heart rot of sassafras caused by Fomes ribis, P. Spaulding {Science, n. ser., 

 26 {1907), No. 667, pp. .'f79, ^SO). — A description is given of Fomcs ribis, which 

 is found attacking the stem of sassafras trees. This fungus occurs quite gen- 

 erally throughout Europe but is not at all common in America. An examination 

 showed that the sporophores were always located at points where the heart- 

 wood of the tree had been exposed either by the breaking of the branches or 

 the splitting of the main trunk. The fimgus apparently enters the tree trunk 

 in the same manner as most of the so-called wound parasites, and progresses 

 into the heartwood. extending upward, downward, and sidewise, until the tree 

 finally dies or is broken by the wind. 



