THE KLTSTS OF NOVA SCOTIA. — FRASER. 833 



before the spores are shed aud Inirned. However, little injury 

 is done by these fungi and no measures of control are necessary. 



Fenderinium Pcckii and Caeorna Ahietis-canadensis Farl. 

 occur on the leaves of the hemlock (Tsuga canadensis), but 

 they are not \ery common nor of much importance. Necium 

 Farlowil, which attacks the leaves and young twigs, is more 

 injurious. The infected twigs soon curl up and die, but the 

 fungus is rare and therefore of little importance. 



The leaves of the spruces (Picea) are attacked by the aecial 

 stages of the Ledum rusts (Melampsoropsis ledicola, M. 

 ahietina) aud though sometimes they are very richly infected 

 yet no serious injury seems to be done. The destruction of the 

 Ledum plants in the neighbourhood of the spruces would 

 probably be effective in controlling these rusts. The spruce 

 cones are also attacked by the aecial stage of the Pyrola rust 

 (Melampsoropsis Pyrolae) . 



The aecial stages of the willow aud poplar rusts (Melamp- 

 sora Bigeloivii, M. Medusae) are found on the larch (Lanx 

 laHcina) but they are rare and of no economic importance, 



Riisfs of Deciduous Trees : The leaves of the poplars and 

 "willows are attacked b}'^ tJie uredinial and telial stages of 

 Melampsora Medusae and M. Bigeloivii respectively, and those 

 of the birches by Melampsoridium Beiidae, but the injury is 

 not serious and does not usually call for control. The burning 

 of the infected leaves in the fall would ])robably l)e helpful in 

 checking the rusts. 



The aecial stage of some rust of the genus Oymno- 

 sporangium has been collected on the fruit of the wild plum 

 (Amelanchier), and probably the alternate host is the low 

 juniper. Tt is })robably rare and of little importance. In the 

 United States the aecial stages of some specias of the genus 

 Gymnosporangium attack the leaves of the cultivated apple, 

 but these have not Ix^e.n reported from Nova Scotia. 



Rusts of Shimhs: The rusts of the genus Phragmidium 

 attack the wild roses freely and may attack the cultivated 



I'lux . & TitA.Ns. N. S. Inst. «(•(., Vor.. XII. Ti«ans. 2X 



