302 EXPERIMENT STATION RECORD. 



DISEASES OF PLANTS. 



Preventing leaf blight of plum and cherry nursery stock {Xeic 

 York State iSta. Bui. 72, n. ser.^px). .841-346, Jigs. 5).— This is a continu- 

 ation of the work reported by D. G. Fairchikl in Bulletin 3 of the 

 Division of Vegetable Pathology of this Department; in .lournal of 

 Mycology, 7, pp. 24:0-204; and in the Annual IJeport of the station for 

 1892, pp. 042-673 (E. S. E., 4, pp. 500, 9.54; 0, p. 00). Dnring 1893 the 

 experiments were continued on the treatment of plums and cherries 

 which bad been treated previously with Bordeaux mixture. The further 

 treatment of those trees which had been treated with other fungicides 

 was abandoned, as it was shown that their foliage was more or less 

 injured by the fungicides. 



The cherry stock consisted of Windsor, Yellow Spanish, and Mont- 

 morency on Mahaleb and Mazzard. They were practically free from 

 the disease during 1893, and consequently no appreciable advantage 

 was shown in the treated over the untreated trees. 



Of the plums 3 varieties, Early Prolific, Purple Egg, and Italian 

 Prune on Myrobolan and Marianna, were treated. Two treatments 

 were given, one June 13 and the other July 14. The leaf blight was 

 abundant among the plums. The sprayed trees, however, held their 

 leaves about a mouth later and made a much better growth than did 

 the uusj)rayed trees. The benefit of the treatment was seen not only 

 in the more perfect foliage of the sprayed trees, but in their increased 

 growth, as shown by the increased weight of top and roots, as well as 

 the larger diameter of trunk. 



The strength of Bordeaux mixture used in this work was 1 lb. of 

 copper iSulphate to 11 gal. of water, with the necessary amount of lime. 

 Detailed directions are given as to the methods of preparation and 

 application of the fungicide. 



The author's summary is as follows: 



"(1) In 1892 cherry nursery stock was successfully treated for the prevention of 

 leaf blight. The same trees treated again in 1893 showed no benefit from the treat- 

 ment, because both treated and untreated trees werejiractically free from the disease. 



"(2) In 1892 plum nursery stock was successfully treated with Bordeaux mixture 

 for leaf blight. The same trees were again successfully treated with the same mix- 

 ture in 1893. The good effects of the treatment were shown in the increased growth 

 of both tops and roots, and in the healthier foliage. The foliage remained attached 

 to the braches aV)Out a month later than did the unsprayed foliage." 



Some fungus diseases of plants and their treatment, H. H. 



Laimson {New Hampsldre Sta. Bid. ]9, pp. 13, fiij. 1). — The author 

 popularly describes some of the more common diseases of fruit trees, 

 such as scab and cracking of apples and pears, blight of pears, and 

 black knot and rot of plums and cherries. Formulas are given for fun- 

 gicides and directions for their application. A summary of experi- 

 ments in spraying is given, in which it is shown that in 1892 a Fameuse 



