| Show Black Black avian Bushes Menace Is ts a Cons Constant Agency in In Spreading Deadly Blister Blis Buis- t ter r Rust of White Pine Prepared by the States SIMes Department of ot c Destroy a penny and save saye six dollars dol dol- doli i lars iara I That Is substantially the advice mI of Samuel B B. B Detwiler In a pam phIt ph- ph let It flack Currant Spreads WhItePIne White PIne fine Blister DUster Rust just published for free distribution by the United States Department of Agriculture Mr 1 D Detwiler t estimates that If It each European black currant bush hush In the United States Is worth orth 15 which he Ilc thinks an nn valuation th the total value alue would be less than O The value of ot the merchantable white pine Is approximately or COO GOO times tImes' us as great The black blackcurrant blackcurrant currant Is a x l df enemy of the white whitepine pine and n a agency In spreading spread spread- ing fug the deadly blister rust Similar t to B Black ack Stem Rust The blister ru rust t of ot white- white whitepine pine Is similar to black k stent stead rust of t wheat In 11 that the run fungous Clus disease In each case base lives alternately on a valuable plant and ami then on a n nurse plant Wheat t rust Is not transmitted without I. I the nursing service ser of ot the common barberry Blister rust Iuston on the white whitepine whitepine pine does not go from train tree to tree The fie spores spares of the disease go o from the pine to a currant or gooseberry plant rind fwd and these serve ser as ns sources of ot Infection tion to the tile pines study of the Ule disease by of the bureau of plant Industry has revealed the peculiar s susceptibility of the European black currant The more familiar currants and gooseberries do not contract the disease over o great distances and ami cannot cannot can not Infect pines s at fit a distance of much more than BOU 1100 or 01 possibly 1300 1500 OO feet I hut ut instances are known In which the black currant has contracted t the le Infection infection In In- f cUnn at nt a n distance of miles from the nearest Ulster blister rusted pine The European black currant then becomes be be- becomes comes a source for common com com- mon currants and gooseberries and I Is Isable a able lle to Infect pines s a n mile away The common currants and gooseberries In turn may Infect trees within the tilE f foot ot zone or other plants of their kind within the tile area areu Mr Detwiler states that the I European Euro Luro- uro- uro Mena black currant Is so susceptible to the white pine blister rust anti and consequently effective e In the rapid spread and antI establishment of the that the United States nse se lse Depart Depart- mem meat of Agriculture reco recognizes the cultivated d black currant as a n distinct to the white-pine white timber thither supply sup ply of the country A Public Nuisance It Is so serious a n danger to the production of white pine timber Umbel as to tomake tomake make nak this kind hind of currant a II public nuisance In all nil states where white needled five pines grow The de der department advises against t the growing of this species of at currant nIh s L. L an anywhere In the United States and recommends that state authorities authorities au au- nurserymen n and growers take tale active steps stells to accomplish h Its Its' prompt elimination from the tile Pacific Rocky Mountain Atlantic Appalachian an nn Ohio Olio Valle Valley Upper Mississippi l Valley and Lake Lale states The growing of cultivated ute black bluck currants In home gardens as well as In nurseries and anti commercial plantings should be hp entirely en en- entirely n. n abandoned throughout these states stales states because of the great Importance of white and und the pines relatively small r Clue of of black currants Miscellaneous l Publication 27 M Is a ar r revision Islon tn with added illustrations of an un article Mr Detwiler contributed to the current curlent Yearbook of the Depart Depart- ment It is available for free fre- frelis distribution dis lis- lisI I on request to the Department Depart Depart- Department ment of Agriculture Washington ton I D. D C C. |
