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Image 7 of Kentucky farm and home science, special report 1, July 1955

Part of Kentucky Agricultural Experiment Station

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. i ll" y 4 ~~. ! L` . . i .. l ~ ~· _ .. r.-» L ll ·· . ·. _ '‘i t . etter A v • t . > *e+’j; . ~ ‘: I E /./ _v} 31‘l€tl€S 0 ’ ~ A fly ir s, A ‘ ' _`~q‘ `vls v_ »>* _ T" “,.‘,,,z;¤ n- _ ’ tr mfg}, .., .;·’i \ _ I * im g V A ‘ ll s\ < . , _ .·•— _,., ; V__V> m__~ , ._,;. "' ·*‘°i _"~ 4 ·. X ` V; t It 5 vi ésif N .. Ali`? fn ,J "’·*’#&gi‘¤ ` · .»" ` lg _' I! T N __;_ .;__f;,_ . sr 0 3(`JC0 .. . »~ , · ,':#¢>‘.."·»Q ~ w ·- ` Ali`ii *>' .;·· Q _ V \ 4 . ft 1·. ` (**57 ‘:T: ’ In developing wildFire—resistant tobacco varieties, dependable means B W D Y U _ must be used to determine to what extent the plants are susceptible. s l ' ' :1 €`m’ Here plant pathologists E. M. lohnson and G. \V, Stokes examine a x\gl`OllOlll\` l)€l)21l`UIl(flll . . . ` . . _ _ _ ._ .{ * · leaf which has been inoculated with the wildhte oiganism. This * variety is susceptible to wildfire, as shown by the dead areas of the at inoculated leaf, and will therefore be discarded in the breeding pro- gram. } Several disease-resistant burley tobaccos developed varieties should be resistant to other diseases as well . by the Kentucky Agricultural Experiment Station now as to black shank. r · . . » . are well known to growers. Ky lo, 22, 2b, and —llA Another phase ol the breeding program that has il have resistance to black root rot. Ky 56, 57, and are promise is the development of burley tohaccos with P highly resistant to black root rot and mosaic. Ky 55 lower nicotine content. Present varieties are distinctly A is resistant to mosaic and black root rot, and to the dillerent in nicotine content, Ky —llA being lowest in ” most common strains of the lusarium wilt fungus nicotine and Ky 26 highest. But within these varieties found in Kentucky. Still higher resistance is desired there appear to be lines that are lower than the aver- and, we believe, is present in some ol the newer lines. age ol the variety, and these are being selected and \’Vildhre, a bacterial disease that has been destructive tested to see it they are actually lower. ll` the desired ` in plant beds the past lew years, also can be prevented level (`il1ll1UL be reached by selection within good ‘ by breeding. Three burley varieties carried under burley varieties, there is good evidence that, by c1oss» Q experimental numbers (\\’.l·`. 4-5l, 17-5I, and l2-53) ing with lower nicotine tobaccos, burley varieties ol` are being tested over the state in variety tests and by nearly any desired nicotine level can be developed. 1 farmers. These are also resistant to mosaic and highly resistant to black root rot. Other promising lines re- . . . . . ’ ‘ ’ ' ._ T ‘ ‘ . l ‘T t sistant to these three diseases and also to lusarium wilt *~ENTU(»*~‘ YARN AND HOML S(‘lm\(‘L _ are al)l)l·0uChjHg [hg [est Smgcy A repott of progress published cluartetlv bv thc Kcntutkv I J hith (llsezibe [llut- ",€ llope [O I)l,€\_€nt (OH]- i\Q.ll§Il|l\l(;ll tl l\l)LIllll(lll bl lll(lIl, lIll\Ll\ll\ (ll l\llIllll \ . . . . .0. l U ' t>l€¤€l>’ br *A>¤‘€€<*·¤s ¤ bletk »1¤···t- Heli ¤‘<¢»~¤=···<‘<¤ t<> m.»...T,t» ............................................................ t» .—.. at I. vari. —_ black shank is found in the wild species Nicolicotzt Assc»c·iate1>iiecu»r ............................................ yy. tftsattigns Iong·;j[om_ lt logkg HOW as though [lug l-Cslsmmc lh(:llll;ll\lIdll\L Assistant ........................,.......... .... \lll,Hll*..`lIll:l| . . El ll 'S ......................,. . .........,..,........,..............., . . t 4 has been successlully translerred to tobacco by cross- IU, (L 1,,,,,,,,, breedinr with .\ll(`Ulf(lIl(l [mtv! lom, as some ol the re- (’*l****¢‘ .|**l*'*`**'* ` 5 \I·ttc·ti·tl 'll)l)l"tllll*' i11 this pulvlic‘ttion nrtv hc tcpto ’$ Sulung Sunnis Show (·()nll)l€t€ licslsllllulc lll Hclullll *‘ll duced without tttttlttcr pcttnission, providctl that lull g ljlktllls, l)()lll lll tl1€ gl`€€llll0tl>c‘ Ltlltl ttl [llc l1€ltl. \v'll€*t`€ acknovvlctlgntcnt is inadc ol thc- soutcc and that tto change Su$(·€l)[ll)l€ yin-i€ll€g in-ct killed in [Owl lly [lm (llgeuscl iulltcaclnigs or tc·\t ts tnaclc vvtthout apptoval by thc . . ' .‘ . ill! IUI] - 9 ln tlns breeclmg work, burley and dark varieties hav- '\ml,(.__ U,,,.(.,l,(,ml(.ml. illmu, ",,l(l(._ in ,|,i_ I,l,l,liH, lllg l`€SlSl2t1l(`€ lt) ll1€ ()lll€l` tlls€1ts€S 1ll`€ tIS€tl iii llte tion to (’llll('lvlllc‘ cditor ot •ht·aulhots. at the \§lltl|lIl|lLll » recurrent backcross parent; consecluently, the resulting |°\l’°"'"°"' MMO"` l‘°\'"lil°"‘ l`°mu°l`l" * AGRICULTURAL EXPERIBIENT STATION 7 e 1