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Vol. 16—1962 - NorthEastern Weed Science Society

Vol. 16—1962 - NorthEastern Weed Science Society

Vol. 16—1962 - NorthEastern Weed Science Society

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420<br />

S;!.nce t~es treated w:Lthfilnuron d:J,es~or may recover from<br />

what a.ppearto ~,~ot1Qeable eff~tJ,1t is import., to recognize the vaa';f,ous<br />

symptoms and to be !Il!le to pred;l.1;'lf,~ether an atf'~~~ tree w:Lll d:J,eor r~over.<br />

, ". :.":{j :):\; . '.:-: 3 ._ ". . ,:<br />

, 'The.cle~t case is ~t"C!f the healthy.: ~ maple leaf duri~<br />

the height oftheyre~feed:J,ng,~ }ligh, photOsyn~~8,,,jleason. L1ghter-~d<br />

spots first appear in the tissue; Qt'"the leaves b~~'J:he veins. These ~<br />

be detected by' lookins through the leaf toward the sUn. The colors of these<br />

spetliJ chanae ,b~d on the l1gb.t,.:pectrum scale, Fen-yellow-orange-redbrown,<br />

untilthey'seem to be delIA.Jq&terial. ;tn ~J~antime, ,the edges ot j<br />

the<br />

leave8~eatld. ~;,~ the l1v~n~.~.af is reduqe

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