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nute black sclerotiae. In spring when the young leaves, appear 

 these sclerotia produce myriads of spores and new infections result. 

 The spores can infect directly young leaves, but the bark of 

 two-year-old seedlings can only be entered by some wound. 



Preventive measures: 



1) Perfect cleanliness in the seed bed. Weeds should not 



' 



be left to die on the ground. 



2) Stable manure imperfectly buried in the soil can also spread 

 the disease. 



3) Damp low lying situations should be avoided for nursery 

 purposes. 



4) Spraying with the following solution will check the pro- 

 gress of the disease: 



Sulphate of copper, 1 1 Ib . (kgs 5 ) 



Carbonate of copper, 16 Ib ( 7 25) 



Permanganate of potash, i Ib ( o 45) 



Solft soap, 3 Ib ( i 35) 



Rain water, 100 gals (lits 454) 



The ground also within, and for some distance around, the af- 

 fected patch should be thoroughly wetted. 



5) All diseased seedlings to be collected and burned. 



A. W. BORTHWICK. Peziza Willkommii on larches. (Notes R. 



Bot. Gard., No. 21, pp. 23-26, PI. I, Edinburgh, 1909); Exp. 

 Stat. Rec., May 1910. 





 This is a discussion of efforts to find exotic species of larch 



that are resistant to the European larch canker (Peziza Willkommii). 

 Two species were tried, Japanese larch (Larix leptolepis] and a 

 western larch (L. occidentalis], but neither proved to be immune from 

 the attacks of the fungus. 



A. W. BORTHWICH. Peziza Willkommii on Larix occidentalis 

 Nutt. and Larix leptolepis Gord. (Notes from the Royal 

 Bot. Garden. Edinburgh, XXI, Aug. 1909, pp. 23-26, i Plate). 

 Botanisches Centralblatt, Band 114, Nr. 8, Jenn 1910, p. 191. 



Occurrence of larch canker in Larix leptolepis, a species often 

 supposed to be immune, and also in 5 year old seedlings of the 

 rare and little-known Larix occidentalis. 



