Show DISEASES OF POTATO problems of increasing im M to agriculture no trouble has cluied caused greater difference of opinion as a to nature end and cause than leaf roll symptom symptoms vary greatly dy by N ORTON no plant disease in this generation ban has ln ilu the subject of uch such general discussion as that known in germany as the Diat Blat troll krank helt herein named I 1 leaf roll none hai has aroused greater difference of opinion as to ita its nature and cause and no other malady of df plant plants la 13 today receiving so much in v sti gatlon by skilled pathologists as this possibly no distaso aich which baa has appeared ipp eared cince since the forties presents a greater menace to potato culture the literature on leaf lea roll froll b his become so voluminous that few will undertake to peruse all the contributions leaf roll la Is a disease characterized by an upward rolling of the leaves by Compa rivan of healthy and diseased hills of same varieties k L decreased creased do yield of albers and by of the diseased condl lion through tubers planted pla it its symptoms vary so much in detail that they an bo be roust most clearly outlined by sepa ato treatment the rolling of the leaves Is the most and conspicuous symptom of ate this the leaflets curl or roll hpward on their midrib often album lug mg ii a nearly tubular shape and giving stylus L plant a Bt star irving ying appearance this rolling ie in restricted to the apper leates leaves while in other cases all dr nearly all of the ler lep ies may exhibit tt this type of roll Is distinct from burly dwarf condition but a very roll may be induced by other fausca the color of the foliage changes with the advent of leaf lea roll froll but these olor symptoms vary greatly from asee ases where the leaves aisuke an un healthy althy Se light green color V to those marked by T renounced yellowish yellow lah red or pu sh tints ahe efat of la atrit on tho the plant is to heck development there Is a lessening es or cessation of growth the shoots remain short and the leave leaves stand more upright there Is how no rich shortening of stems and leaf teat ribs as occurs in curly dwarf dart with ltd td resultant deformation of the plant the duration dur tIon of life of the plant Is shortened jy y leaf roll thia this is in a rea five tive matter since the leaf lea roll froll alses 0 y die dle earllen earl lei ici as would mould bo be expected it it ick sick plants the truo leaf loll 1011 ie is inheritable the from diseased plants produce diseased progeny as a general rule ab uppa atlan shows yields of healthy anti diseased hills caused by curly ahone yields at af diseased and healthy hills hille caused by leaf roll abw affords a means mean of ot distinguishing roni roat the genuine loaf leaf roll those tern tom wary conditions which give riso rise to n I 1 biallas appearance of the plants all those who itte best acquainted with the trouble agree as to the r re suits of planting diseased seed block stock chis point Is to one of capital importance n the control of the disease and of great reat interest in its bearing on th the a baturo laturo of the disease that leaf roll is lot tot communicable from diseased t to plants Is the conclusion to be fr afna aval table |