192 Report of the Botanist of the 



cankerJ 



(Sphaei'opsis malorum Pk.) 



This disease has killed a good many Spitzenberg trees in the 

 vicinity of Voorheesville and iSTew Scotland in Albany Co. It 

 occurs destructively at Pomona and Blauvelt in Rockland Co. 

 At Blauvelt it is especially troublesome on the variety Sour Bough. 

 It has also been observed at Yorktown and Poughkeepsie. 



sooty blotch. 



{Phyllacliora yomigena (Schw.) Sacc.) 



Rare. A little found on apples received from ISTewburgh and 

 Yorktown. 



etjsseting of fruit. 



Russeted apples are reported to have been common in the 

 vicinity of Hudson. We have seen the disease on Baldwins and 

 Ben Davis at Poughkeepsie. The affected fruits were frequently 

 misshapen and showed irregular areas on which the skin was rough 

 and light brown in color. This appearance is sometimes due to 

 spraying and sometimes to weather conditions alone.^ It is often 

 incorrectly called rust. 



RUST. 



(Gymnospora7igium spp. Syn. Roestelia spp.) 



This is a fungous disease in whichi circular yellow spots appear 

 on the leaves in June. It may attack the fruit also. The red 

 cedar, the host of the teleuto stage of the fungus, grows spontane- 

 ously throughout the entire district and " cedar apples " were 

 found quite commonly upon it during early May in Ulster and 

 Rockland counties; but the ascidial stage upon the apple has been 

 entirely absent. 



7 For an account of Apple Canker, see Bulletin 163 of this station. 



8 See Bulletin 84 of this station, pp. 29-33. 



