DISEASES OF PLANTS. 657 



It is claimed that tlie tliseast* may be entirely eradicated from the orchard 

 by careful attention to the destruction of the cankers and mummy fruits, sup- 

 plemented by effective spraying with Bordeaux mixture. 



Bitter rot of apples, horticultural investigations, ,7. C. Blair {Illinois Sta. 

 Bui. Ill, pp. .'i82-551, pis. 2). — An account is given of spraying experiments for 

 the control of bitter rot of apples, the experiments having been inaugurated in 

 1901 and continued for 5 years. lu this work 12 orchards were used and 17 

 series of experiments were conducted. 



The experiments in the different years together with the results are described, 

 and in conclusion the author states that Bordeaux mixture properly made and 

 applied will save more than 5)0 per cent of the fruit liable to attack by bitter 

 rot. Bordeaux mixture applied in the liquid form is the most effective spraying 

 material for the control of bitter I'ot, dust Bordeaux being less efficient. Pure 

 copi)er sulphate solutions failed to check the disease and caused considerable 

 injury to the foliage. Fruit sprayed in such a manner as to be thoroughly 

 coated with the spray mixture when the first infection of the disease appeared 

 was less injured by bitter rot than when sprayed at a later period. 



Attention is called to the sources of infection and recommendations are given 

 for the control of bitter rot. 



California peach blight, R. K. Smith et al. iCalifornia Sta. Bui. 191, pp. 

 IS-lOO, figs. 11). — The California peach blight, which is due to Coryneum heyer- 

 inlcit, is described at considerable length and suggestions given for its control. 



This disease has recently appeared in the principal peach producing districts 

 of the State. Nearly all varieties are more or less affected, the young growth 

 in some places being completely killed. 



Experiments were carried on for the control of this disease, and it was found 

 that trees sprayed in December or early in January, followed by applications in 

 February or early in March, were not only less affected by peach blight but also 

 by the leaf curl. In connection with the spraying the trees should be pruned if 

 possible, but in no case should the work be delayed on account of inability to 

 prune. For the first application a rather strong Bordeaux mixture is recom- 

 mended, while for the second a somewhat more dilute solution or a lime, salt, 

 and sulphur spray may be employed. 



The grape powdery mildew and the injury it causes, M. Jeria {Rev. Vitivin. 

 Argentina, J, {1901), Nos. IS, pp. 202-20 Ji ; IJ,, pp. 218, 219; 15, pp. 232, 233; 16, 

 pp. 25 J,, 255; 19, pp. 296-299; 20, pp. 312-314) .—This describes the powdery 

 mildew of the grape, due to Oidiiim tiickcri, gives an account of the losses due 

 to this parasite, and suggests remedies for its control. For this purpose the 

 use of dry sulphur at the rate of about 100 kg. per hectare in 3 applications is 

 recommended. 



Diseases of cofEee trees, G. Delacroix (Agr. Prat. Pays Chauds, 1 {1901), 

 Nus. 51/, pp. 235-253, pis. 3; 55, pp. 321-333, pi. 1). — This paper describes the 

 leaf spot diseases of coffee caused by the fungi Stilbum flavidum, Sphwrella 

 coffeicola, Cercospora coffeicola, GloEOsporium coffeaninn, etc., the destruction 

 of the floral branches by Anthostomella eoffew, Hendersonia eoffew, and Rhab- 

 dospora coffew, and a disease of the roots due to an undetermined fungus, the 

 fruiting form of which is as yet unknown. 



The fir disease in the Jura forests, E. Henry {Compt. Rend. Acad. Set. 

 [Paris], I. ',5 {1901), isio. IS, pp. 125-121). — According to the author, in the sum- 

 mer of 1906 a disease became abundant in the fir forests in the Jura region 

 which was characterized by the reddish color of the foliage, the color seeming 

 to increase toward the end of the summer. In the spring of 1007 the disease 

 had apparently disai)i)eared, but during the summer it reappeared and attacked 

 the branches of a great number of trees. In October, 1907, it was reported that 

 29740— No. 7—08 5 



