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Vol. 16—1962 - NorthEastern Weed Science Society

Vol. 16—1962 - NorthEastern Weed Science Society

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)"509<br />

pounds per acre. Thirty ot~ Joung established annual flower<br />

species were undamaged by tritluralin at this rate. Dipropalin<br />

~has :been le~.s w:1deJ,;y,t.,s,~, ,~,8hows 8:~a!' satetyto '0%'11&;':<br />

~en~tal~~::""i" '." ;}' ::' .: \~i" .'... J.,<br />

la~l! ~o·it1=~'~"P~ ·Act:L,!:~i.J:~';'· Severa}; ,e~1ments 'show ee.tfenUa1f:ythe<br />

&~,~uults.:aJ.N!"''F') given in TabJJeJ. In this e~llrlmentera~gr8,-Si"<br />

t~8t beo .... ,.,ill11:11e in' untftated are •• on Jo1.tI~.<br />

A,~, the,:'M"7~~' ~ppJ.ioa.U()n·4.t., it was in.'tbIel ..leaf' stage; '0W1.~ ,<br />

M'ay17 ,the .?,:!,l.~.f stage JC~.~,M.y 21.1,the '2s..n4 3-lea£ stage'" 'll'1d<br />

on, June?, . t~e~.3 ~nd 4_1 •• , .~'Ie. Excellitnt control wail o~Ubed<br />

with both dipropalin and trifluralin through the May 24tJOI.t. ..<br />

ment. Activity was reduced in the last application at the 3 to<br />

4-leaf stage. Dipropalin and trifluralin at recommended rates<br />

control crabgrass throu~h:;.~._a::leat etllge.<br />

J!e!etdin~ c~~¥.~te! -:-, );>iprClpa~il1, .$ondtritl ur~l~D l!ere app.l1l!d: aZ}4<br />

de~iz:ab.~Ef ..t·u.r'.,f',g~.,."'.d..~e s ,w.e..1" ;'~.'." !!-QQ~d .at the 1i~~ of ehem1ca.l .,&:P.Pl1­<br />

cati6n,'an.d, ;threeand, si,x ,,~~ f'ollowi~& rW.... tment (TabJ.,,,,4).<br />

Injury ratings vere made -s1'1' to seven weekI atter each seeding.<br />

No injury was observed with either chemical six weeks after<br />

treatment. Current recommendations are to wait 45 days after<br />

treatment before reseeding.<br />

Table 4. Reseeding Injury of' Turf Grasses after<br />

Dipropa1in and Trifluralin Treat.ent~7<br />

- - - - - - - - - - ... - - - - - - ...- ... ....... ...<br />

Turf<br />

Ir!a~m!!n~ .GraaS!!S - - .O_W~s.!. ... .3_ W lE s" - -<br />

_6...w~s.:<br />

Dipropal1n Bentgrasll 4 3 1<br />

8 Lb/A Bluegrass 5 4 1<br />

Fescue 5 3 1<br />

Ryegrass 3 1 1<br />

Triflura1in Bentgrass 4 3 1<br />

2 Lb/A Bluegrass 5 3 1<br />

Fescue 5 3 1<br />

Ryegrass 4 2 1<br />

- - . - - ....... . ... - ...... - - ...<br />

!I l-no injury, 3-moderate injury, 5-complete kill

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