830 EXPERIMENT STATION RECORD. 



gray, or brownish in color, tlie center usually being of a diflerent color 

 from tlie surrounding portions of the spots. The spots vary from 6 to 

 15 mm. or more in diameter and are irregularly distributed over the 

 leaf, and may sometimes be found ou the peduncle and fruit. The 

 fungus may appear any time of the year, but its most serious attack is 

 usually late in the summer or autumn. The black color is due to the 

 presence of the abundant dark-cylored spores, and as these become 

 scattered the color becomes lighter. 



In California the only variety on which the disease has been observed 

 is the Mission. Its attack is so insignificant that at least for the pres- 

 ent no treatment is required. 



Experiments in -winter spraying of apples and pears, C. W. 

 WooDWORTil {California i^ta. Bpt. 1893 and ]8!J4,2)p. 441-162). — Notes 

 and extensive tables on experiments in spraying apple and pear trees 

 for two seasons against the oyster-shell scale, greedy scale, and woolly 

 aphis, conducted in the station orchard at Berkeley. A i^lat is given 

 showing the arrangement of the trees treated. Various insecticides 

 and fungicides were used, both alone and in combination. The results, 

 as indicated by the elaborate detail of the several tables, seem to show 

 but little value from the treatment. Formulas are given for the prepa- 

 ration of various insecticides and fungicides and the indications for 

 their use are mentioned. 



Peach yellows experiments, M. H. Beckwith {Delaware Sta. Rpt. 

 1893, pp. 152, 153). — The author reports experiments with seedling 

 I)eacli trees and with trees brought from a region where the yellows is 

 not known, in which it is shown that such trees are no more callable 

 of resisting the disease than others. 



A 'disease of mulberries, A. Prunet {Compt. Rend., 120 {1805), 

 No. 4, pp. 222-225). — The author claims that there is great confusion 

 in the diseases of the mulberry, due to their varying manifestations. 

 He thinks there is a disease of the mulberry similar to that of the 

 grape, which he has called chy tridiose, and that it is due to a species of 

 Gladochytrinm, to which he has given the name C. mori. It differs from 

 G. viticolum^ in its smaller zoosporangia, cystes, and zoospores. Its 

 attack on the mulberry is very similar to that of the related species 

 on the grape. The treatment recommended is the same in each case, 

 applications of solutions of iron suli)hate. 



The black rot and its practical treatment, G. Lavergne and 

 E. Marre {Le Black rot et son traitement pratique. Bordeaux: Fere, 

 1895). — The authors have prepared a condensed manual based on their 

 observations made in 1894 during an official examination of the black 

 rot and its practical treatment. 



Their conclusions are as follows: 



1 Compt. Rond., 119 (1894), No. 19, pp. 808-811 (E. S. R., 6, p. 642). 



