Vol. 15—1961 - NorthEastern Weed Science Society

TRANSLOCATION OF AMITROLE,ATRAZINE,DALA.PON
ANDEPI'C IN NORTHERNUTGRASS
1
W. F. Donnalley and E. M. Hahn
2
Abstract
Fc;mrchend-cals, pr~;iously found' to be: act,"ve on northern nutgrass were
used i'P ,this ~tudy. :X1ley wer!!: ",8JIlitrole (.3-amino-1,2,4-triazole)3, atrazine
(2-chloro-u-ethy1amino-6-isopropyl:amino-s.;.triazine).3, dalapon, (sodium 2,,2-di-,
chloroprop;i.onate) 41'1dEPTC,(etbyl N, lJ..;Q1-n-.propylthiolcarbamate)J. ,'The study
was undertaken to, dete~ne th,edegree of translocation of these chemicals in
nutgrass follow;i.ng, s011 and foli.ag~, applications" at ,varYing stages of' growth.
Autoradiograpbywas employ-edto stw;lythe translocation of radioactive amitrole,
at razine , and EPTC.. :
Atrazine and EPI'C (or' a C 14 lab~led d~gr~ation product) ~ere readily
translocated throughout nutgrass plants following so11 applications to 2- and
12-inch plants, but did not enter ungerminated tUbers. Similar results were
obtained when 2- and 12-inch corn and potato plants treated as above with
atrazine and EPTC, respectively. However, both ungerminated corn seeds in
atrazine treated soil, and freshly-cut potato seedpieces in EPTCtreated so11,
absorbed a label¢. ,cQJI1P9und.
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Autoradiographs ,fromfollage app1ic,tiot1S, of atrazineand EPTCto 2-inch
nutgrassp1ants indicated that ,these chemicals were tlottra.ns10cated basipe'tally;
but when atrazine and EPTCwere applied to 2-inch com and potato plants, respectively,
there was a slight amount of translocation to the roots. Similar
foliage applications of amitrole, atrazine, and EPTCto 12-inch nutgrass plants
resulted in a labeled compound being transJ,ooated acropetally to a considerable
degree for all three chemicals. However, only in the amitrole treated plants
was a labeled compound translocated basipetally in appreciable amounts. When
atr~zine and,EPTC were applied tothefolj.age of 12:-inchcom and potato plants,
respectively, acropetal movement was considerable, as with nutgrass. Basipetal
movement, however, ~ slight ,but, more than 'WaS the case with nutgrass •
.Autoradiograp~ from .foliage appl1c,.tions ..