Show IMPORTED TREE DISEASE the poplars poplar of this th I 1 s country coun are I 1 now low threaten norl ocl by a dangerous fungous disease which ha has ze evidently 0 been imported t in recent years from europe europ T this his di disoso attacks the th twigs limbs and trunks of the lie L black and lombardy pop poplars I 1 ars nigra and of the carolina pop lars or cottonwoods cotton woods pop delt oides and may be expected to attack other species of pap poplars ard and cottonwoods cotton woods in regions not yet investigated according to the plant pathologists I 1 of ta tho U S dc department pa ament off cf agriculture this disease is caused by the fungus po it occurs first in the forni form of cank ers or depressed dead areas archis in ili the bark much in the same man ner as in case of the blight of chestnut trees which is ia caused by a distinctly bifi different crent fungus the effect of the fun fungus us on poplar and cottonwood trees is as follows bankers cankers cank 1 s are formed st at the point of attack screed rapidly 13 and often girdle the twig limb I 1 or trunk at the point ol of attack t k killing the tha part above the canker trees attacked on the trunk becce it spike topped the death of or limbs and avii twigs gives the he L trees a ragged appearance which spoils their beauty and I 1 later ater kills hills them T 1 l s is especially alio on case E e with bla black or poplars which are frequent frequently t 1 planted in rows olo along n borlev boulevards wis and rid avenues the european is roost most severe I 1 in its effect or oi stored ored arid and transplanted nursery stock tok tree when I 1 in arar it and when in the grouf td or f M WY ril anted in ih in a aro sro 10 readily attacked k by A f and qua id ruined I 1 thil a 0 v ra lor T erica eri d of tima a a tra ss I 1 is sircarl by 2 ns af spores produced haf A bod bodies fes s in hi the firm of small oi oil or 0 I 1 tra tt A m a il ih li lariff lari lk tf the he con acera from i pus PLA valc ill iii nie there ars are exuded small sticky ercer cil ored tendrils which soon chang cann to a tawny olive rr cr even evena a wa nut brown thesa the lendi lend rila il c cink nain millions of spores v ach s spread pread the disease in various various ways the fungus frn us causing engoren En enro roren enn poplar ez zinker ealter was vas first found fo un d in troyes france fance bild nd bribed in in I 1 1834 in 1903 the first outbreak to be noted was rc ported and tile the described by tile the french put delacroix an outbreak of the als daisv ease in italy was vas r reported port d I 1 in 1807 1907 this ellis disease was first L reported in america by a corres Vr ident of the ille plant D disease sease sur survey lly in in 1915 from massachusetts chu and new hampshire but the causal fungus was not correctly didenti identified L fled during the he present year the pathologists pa tholo fists of the department department fou found sid the disease prevalent in small areas in certain cert min districts district in ili the following intes ates new ire massachusetts chu chlis etts rhode island cut new nev jersey pennsylvania delaware mary land ohio nebraska bl aska and new mexico TIM the centers of infections appear to be in every case either cither cert certain ain nurseries now known to contain conrail con tail diseased trees trees or points where poplars received from such nurseries have been planted As this disease was not known in the united states till recently it i Is evidently an imported one and must be deallo with as such additional information as to the extent of cf the spread of this new canker disease in the country is desired owners of diseased poplar or cottonwood tz treis es may ay greatly assist if they will notify the bureau of plant industry U S department of ag ri culture |