Vol. 16—1962 - NorthEastern Weed Science Society

Vol. 16—1962 - NorthEastern Weed Science Society Vol. 16—1962 - NorthEastern Weed Science Society

08.06.2015 Views

430 Treatment 400IFahg 2,4-D ,e.m:I.ne (undiluted) ~00/l ahg 2,4-]) amine in water 20# ahg 2,4,5~ ester in ke:t'Oeene Kerosene, ' 100# ahg 2,4-D amine in water (in a second woodlot) ' Species beech red maple sugar ,lIIQ~ wh1te,ub::, basswood ' beech red _~'~ sugar ......:Ili!l'. blaCK ii~Cb:" , J beech :,': ".~., "d JIlIIl~ sugar-·1IitPJe' Wbi:teu!l basswood, : ~00# ahg2,4-D amine ",bassW0d4w . in water ~okory "c ,.>J:' (in a th11'C1woocUot) Amer1QMe1m blaCk :'olIe-rr wh1te:'O!ak' _ ;i .. 400/1.ahg 2,4-D ~ne (placed in Pe.rt;j,'1. cuts 1 not C01iIp].etetriU) , No. trees j.b.h. range Years ~3 4-~4" 2-3 5 6-12" 3-4 5 ,5-10" 3 5 'J::;- 5~ 9" 3-4 3 'lV~" . 6,. 8" 2 ~9 '~-15" 3 24 , '6-15" 3-t 30 0 5-12" 3+ 1 ':.y 7·~4" 3-4 13 ;7-ll" 3+ ~. . r'_ t. " 2 'J., 9 ,4-ll" 2 ';~~~d, 4 5- 9" 3-4., '1r 4 "4- 7" 2-3 [::"'t' : 2 '.5- 6" 2 "I Sf 9 "',f 5-14" 24 2 6" ",-,8"- 3-4' 4 ,6. 9" 3 a ~'1J . 5 " 3-4 2 ',',;d'o:" 7 " 3-4 n-: .px"'-' 4 . I , lao " . '4-12" 3+ "0

These tests show once aaaiJithe need for ecmplete frills in dormant season cl:I"emi-"th1nn1ngin Nort.be..-te:rn United states. They also demonstrate no advantage tor ~.' over esters or 011 alone in dormant season work. 431 Conifers In 1957, a preliminary report (2) was made concerning dormant eeaaon application of und11.~: 2,4-D amine in partial cuts for chem:i.. th1nn:1ng pine plantations. Briefly this report stated: 1.. In red and Scotch piXIe pl.a.Utations, trees 3-5" d.b.h. received, 2 or 3 cuts per tree.. Each cut received 3-4 mJ.. of chemical. 2. For red pine treated in November and ~ch, the terminal leader and uppermost whorl of lateral branches died back the follow1ng June; the whole tree was top-killed by the end of sUIlllller. 3., For Scotch pine, death of trees was sJ.()wer; edge trees with large crowns sometimes recovered. 4.: Presence ofa few dead red pine trees ~acent to treated trees suggested caution in recormnendiqg the new treatment. ! \ Subsequent red pine growth studies have eSt' :blished the probable reason tor death of untreated·· trees in the plan :tion as a combination of drought e.nd shallow soil 'which predisposed t weaker trees to suecessful.. bark beetle attack. S1m:iJ.ar bark beetJ.ei damage has been found on numerous red pines on poor sites in recent y$rs. In the past five years, applica.tion of UDi~uted 2,4-n amine in partial cuts has been made in several. plantat\Lons of moderate size to test the general utility of this method of chemi-thinning. These treatJ!'StXts are described in Table 2. ' Nearly all trees in these stands were top-klJ.led by the end of the graw:l.ng season following tfeatment. Exce:ptibns were hemlock, which was not killed, and sUllllllertreatments of Scotch ~d red pine, which resulted in slow kill over .most Of .. two growing s.asons. Slow kill was observed occasiona1]y in treu, with large,c~s and in trees with fewer than one cut per two inches of di8iJiet'r.

430<br />

Treatment<br />

400IFahg 2,4-D ,e.m:I.ne<br />

(undiluted)<br />

~00/l ahg 2,4-]) amine<br />

in water<br />

20# ahg 2,4,5~ ester<br />

in ke:t'Oeene<br />

Kerosene, '<br />

100# ahg 2,4-D amine<br />

in water<br />

(in a second woodlot)<br />

'<br />

Species<br />

beech<br />

red maple<br />

sugar ,lIIQ~<br />

wh1te,ub::,<br />

basswood '<br />

beech<br />

red _~'~<br />

sugar ......:Ili!l'.<br />

blaCK ii~Cb:"<br />

, J<br />

beech :,': ".~.,<br />

"d JIlIIl~<br />

sugar-·1IitPJe'<br />

Wbi:teu!l<br />

basswood, :<br />

~00# ahg2,4-D amine ",bassW0d4w .<br />

in water<br />

~okory "c ,.>J:'<br />

(in a th11'C1woocUot) Amer1QMe1m<br />

blaCk :'olIe-rr<br />

wh1te:'O!ak' _ ;i ..<br />

400/1.ahg 2,4-D ~ne<br />

(placed in Pe.rt;j,'1.<br />

cuts 1 not C01iIp].etetriU)<br />

,<br />

No. trees j.b.h. range Years<br />

~3 4-~4" 2-3<br />

5 6-12" 3-4<br />

5 ,5-10" 3<br />

5 'J::;- 5~ 9" 3-4<br />

3 'lV~" . 6,. 8" 2<br />

~9 '~-15" 3<br />

24 , '6-15" 3-t<br />

30<br />

0 5-12" 3+<br />

1 ':.y 7·~4" 3-4<br />

13 ;7-ll" 3+<br />

~.<br />

. r'_ t. " 2<br />

'J.,<br />

9 ,4-ll" 2<br />

';~~~d,<br />

4 5- 9" 3-4.,<br />

'1r<br />

4 "4- 7" 2-3<br />

[::"'t' :<br />

2 '.5- 6" 2<br />

"I Sf<br />

9<br />

"',f 5-14" 24<br />

2 6" ",-,8"- 3-4'<br />

4 ,6. 9" 3<br />

a<br />

~'1J .<br />

5 " 3-4<br />

2 ',',;d'o:" 7 " 3-4 n-:<br />

.px"'-' 4 . I ,<br />

lao " . '4-12" 3+<br />

"0

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