250 EXPERIMENT STATION RECORD. 



cankers on the trunk and branches, the infection usually taking place in the 

 fall of the year after the early rains. In addition to the cankers on the tree 

 the fungus is sometimes found upon the fruit. 



For the control of the disease the author recommends treatment based on 

 orchard experiments which proved successful in reducing the amount of dis- 

 ease. The treatment consists of spraying with Bordeaux mixture, using a 

 4 : 4 : 50 solution, in the fall before the beginning of the rains, to be followed as 

 soon as the fruit is picked by an additional spraying of a 6 : G : 50 Bordeaux 

 mixture. It is believed that under ordinary conditions this treatment would be 

 sufficient for controlling the disease, but where the fungus is very prevalent, 

 an additional spraying should be given the trees, beginning somewhat earlier 

 in the season. Where practical the cankers should be cut out before fully 

 formed during the winter or early spring. 



The raspberry cane blig'ht and how to control it, P. J. O'Gaea {Off. Path, 

 and Ent. Rogue River VaUeij, Bill. Jf, 1911, pp. 8). — The author gives a descrip- 

 tion of the raspberry cane blight caused by Coniothyrium juckelii. This fungus 

 attacks all the cultivated species belonging to the genus Rubus, and has also 

 been observed on the wild species, as well as on roses and apples. The dis- 

 ease shows marked virulence with the black cap varieties of raspberries, and 

 the Cuthbert, which is a red raspberry, suffers to a considerable extent. The 

 varieties Lucretia and Primus of the dewberry are also badly injured. 



The parasitism of the fungus has been demonstrated by inoculation experi- 

 ments. For its control the author recommends the cutting out and removal of 

 all infected canes, which should be burned, and after the field has been thor- 

 oughly cleaned, spraying in the fall before the rains begin with a rather strong 

 Bordeaux mixture. An additional spraying should be given in the spring, 

 about 3 applications being made before the blossoms appear. If roses are 

 growing nearby they should also be given attention. 



Eemedy for court noue (Rev. Sci. [Paris], 50 (1912), 7, 'No. U, p. 4^0).— In 

 a brief note it is stateti that Bertrand has found that the application of either 

 sodium chlorid, or sulphate or phosphate of ammonia, to grapevines at the 

 rate of 150 gm. per liter, following the method adopted for the treatment of 

 chlorosis with iron sulphate, has given good results in combating the court 

 none, which is characterized by the extreme shortening of the internodes of 

 grapevines. The use of Thomas slag as a fertilizer, applied at the rate of 250 

 gm. per plant, has also given encouraging results. 



Combating leaf spot of grape (Pseudopeziza tracheiphila), A. Bret- 

 scHNEi-DER (Wiener Landiv. Zig., Gt (1911), No. 5, p. 1/3; abs. in Centhl. Bakt. 

 [etc.], 2. Aht., 31 (1911), No. 11-15, pp. Ji02, ^03).— Experiments were instituted 

 by the author in order to test the hj-jiothesis that this fungus lives through the 

 winter in the veins of the fallen leaves, forms spores on these leaves during the 

 winter, and infects the young leaves by means of these in the spring. Removal 

 of the dead leaves seemed to make no difference in the spring infection. The 

 author suggests that the fungus may winter in the vessels of the shoots. The 

 use of sprays (1 per cent Bordeaux mixture, 1 to 2 per cent Cucusa, and 1 to 

 2 per cent Tenax) seemed to give equally beneficial results whether applied to 

 the upper or the lower surface of the leaves. 



The mildew fung-i and protection therefrom, O. Bboz (MonatsJi. Landtc, Jf 

 (1911), No. 3, pp. 71-78, figs. 6; ahs. in Centhl. Bakt. [etc.], 2. AM., 31 (1911), 

 No. 11-15, p. JfOS). — This is a somewhat popularized discussion of the so-called 

 true mildew fungi (Erysiphese) in connection with suggestions for their con- 

 trol, the main reliance being placed on sulphur applied to the green foliage. 

 Bordeaux mixture is recommended as a wash for trees and vines in 2 per cent 



