Show black raspberry y hurt by disease growers in many sections suffer heavy losses from new ailment prepared by tho the united department ent of agriculture growers of bluck black raspberries rasp berries in va rious parts part lof tho the united states par ticul arly in ohio find and now york have been suffering discouraging losses in many instances from a disease which for convenience la Is called eastern bluestem blue stem during tho last few years tho the united states DL dc of of agriculture has been r it stu studying dying tho the disease in certain local atles find and now sums up what Is known know about it in department circular eastern bluestem blue stem of tho the black hasp berry by it 11 B 13 wilcox profits curtailed tile the di desense sense which Is marked by a 0 peculiar curling of tile tho young leaves find and blue stripes on tile tho cil canca lies bradu ally reduces life iho productivity of the plantations n s and kills tile tho affected plants plais lir irr tivo or three years in some sections where raspberries rasp berries havo haqq been grown extensively for years profits tire aro curtailed to such an extent that farmers tire aro not encouraged to stay lit in the business and tile tho ck of production la Is gradually shifting as disease follows tho the now plantings where investigations have been made the infection of fields has ranged from 0 to 70 75 per cent and total loss losa in tile the northeastern part of tile the count country ry la Is th thought ought to be very largo large some slightly infected patches have been i found in michigan and wisconsin tile tho general effect of bluestem blue stem Is n gradual stunting of tho plant with a 11 reduction of the yield and dwarfing dwar fing of tile berries when affected tips fire are planted they mako make little growth and the folloN following vIng spring they start feebly or not nt at nil all often tho the grower may suspect that the trouble Is win ter killing no recoveries havo been noted if alio affected parts arll ire cut oft off the disease will soon show up in n li mother nother part plants started by rooting tho the tips of diseased plants will always have tho the disease no bacteria or fungi have yet been found that might bo be said to bo be tho the cause but bu certain features of tho the malady such as tho the mottling and deformity of tho the leaves and tho the stunting and final death of tho the plants indicate that it may bo be of the mosaic type diseased tips Plant planted edL bluestem bluestein blue stem stein becomes established by the planting of diseased tips but at the time of digging it js Is impossible to recognize those that carry the infection fec tion tiou and the symptoms do not appear early enough in tile the spring so that tho the diseased tips can be found before they have a growth of several inches thus far no very resistant variety has been found and no spray Is known to bo be the only practical method to get ahead of bluestem blue stem Is to pet got stock irom from a nursery known to bo free of it and set as far na an practicable from dise diseased aceil plantations young fields must bo be carefully watched and plants i showing bluestem blue stem symptoms removed and replaced by healthy tips growers interested in it thorough discussion of the disease may got get a copy of the circular by writing the department of agriculture washington D 0 |