'3J-S NOTES ON lililTISH I'OKKST THKKS. 



Timber li^'ht. soft, spei-itic .t^ravity = -45 ; used for similar 

 purposes as tliat of aspen, hut more valued. 



Found in low lands and river vallej's, likes deei), loose, 

 moist soil, more exacting than aspen. Growtli quick, some- 

 times reaching a height of 100 feet and a diameter of 1 foot 

 in 40 — 50 years ; stem straight ; is light demanding ; foliage 

 somewhat denser than that of aspen. Eeproductive power 

 good, especially root suckers. 



Best propagated by root suckers, less well by cuttings. 

 Treated as pollards, less suited for coppice. Occasionally 

 standards in coppice. 



r. Hhirk Poplar. 



Europe, North Asia ; not indigenous in Britain, but planted. 



Timl)er light, soft ; specific gravity = "45 ; most valued next 

 to tlial of wliite poplar, and used for similar pur^joses. 



Appears in low lands and river valleys. Thrives on any 

 soil, if loose and moist ; does not like heav}^ soils. Grows 

 rapidly, developing a straight stem, light demanding, hardy. 



Eeproductive power good by stool shoots and root suckers. 

 Best propagated by cuttings of various length. Treated as 

 pollards, sometimes standards in coppice. 



IiiticctH iiijiiriotis to poplars (lowralhj : — 



The leaves of young poplars of all species are much 

 devoured by larvic, which are not gregarious, except those of 

 Dicraiiiira and Lij)((ris .s7///r/.s-. The plant-beetles, Linn jkijuiH 

 and trciinihc (an aspen feeder), also attack them. A Longicorn 

 beetle, Saperda popnlneci, breeds in the twigs of young aspens, 

 causing gall-like swellings and crippling the growth of the 

 plant. Its congener, Sapcrda (■(irrluirhia. breeds in the stems, 

 chiefly of black poplar, from f) to 20 years old, and is a great 

 hindrance in many places to growing the tree. \'arious clear- 

 wing moths, especiall,y Sesla apij'ormiii, and the goat-moth, 

 Cossii.s, feed in the wood, often in company with Sapcrda. 



Oi/iniiii, Mrlainpsora species produce a rust on the leaves. 



The mistletoe is fre(jueiitly f(jund on poplars. 



