186 Report of the Botanist of the 



under control by cutting out and burning the knots. It is much 

 less destructive to the cherry than to the plum. Probably the 

 disease has spread less than usual during the past season. We 

 have sought for it on the wild black cherry, Pruiuis seratina, 

 but have failed to find it on that host in Western New York. 



Leaf Blight {Ci/Undrosporiiim padi Karst.). — Leaf blight has 

 given very little trouble either to bearing trees or to nursery 

 stock. In the nurseries of Western New York cherry seedlings, 

 especially those of the Mazzard type, often suffer severely from 

 leaf blight, but in 1900 cherry foliage was generally quite per- 

 fect. 



Witches' Brooms (Exoascus oerasi (Fckl.) Sadeb.) — This fun- 

 gus is now known to occur on the cultivated cherry in three 

 localities in Western New York; viz., at Sodus Center in Wayne 

 County, Appleton in Niagara County, and Elba in Genesee 

 County. In each case it was found only on a single tree. Other 

 places in New York where it is known to exist are Athens, West 

 Athens and Catskill (all in Greene County) and various places on 

 Long Island. It is not likely to become troublesome. 



Hail Injury. — Hailstones too small to break the bark may 

 bruise it in such a way as to cause the formation of brown, corky 

 spots within the bark. Many such spots are indicated exter- 

 nally by the lighter color of the outer bark which may al.so be 

 slightly elevated; but many others are revealed only when the 

 outer layer of bark is removed. We have observed such hail 

 injury to cherries at Geneva. (See Hail injury to plum, page 

 202.) 



Leap Scorch. — Although the season of 1900 was drier than 

 that of 1899 there was none of the cherry leaf scorch such as 

 occurred in 1899. We have watched the Maxwell cherry orch- 

 ard which was so severely affected by leaf scorch in 1899^ to 

 determine the effect upon the crop of 1900. This orchard con- 

 tained 715 11-year-old Montmorency trees. About the middle of 

 August, 1899, 75 to 85 per ct. of the foliage on 637 of these 

 trees was killed by leaf scorch; and on 57 more 50 per ct. of 



*» See Bui. 1G2 of this Station, pp. 172-175. 



