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Vol. 16—1962 - NorthEastern Weed Science Society

Vol. 16—1962 - NorthEastern Weed Science Society

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.10 t<br />

TABLEI. Pre·emer •• nca Control of Crabgrass with Chemicals<br />

, , Amherst, Ma... 1960<br />

*Eatiaate ~ Control<br />

Ulrbi;idl. BlCI.of.6DD1£;IClog. •••6ua••1960••••••• ~<br />

Dacthal<br />

2S lbs/2S00 sq.ft. 99<br />

Zytron, Dry<br />

6 lbl/1OOO sq.ft. 98<br />

Arsenical complex 20 lbs/1OOO aq.ft. 63<br />

FHA<br />

7 pinta/acre 27<br />

Calcium &rsanate<br />

Zytron. Emulsion<br />

12 lbs/1OOO .~.ft.<br />

10 gal/acri "<br />

73<br />

99<br />

Chlordane<br />

80 lbs actual/acre 89<br />

Check<br />

watar 0<br />

* Percent control basad 00 average estimatad by<br />

3 individuals.<br />

'{',<br />

Procedure 1961:<br />

In 19~1 two of the five'bioeks were re~tr•• t*4W'ith 4 chemicala'<br />

which were most effective in cOfttrolflng crabgrasl i. q1960.<br />

To detemine<br />

r the residual .ffect of the fo" chemicals. 2 of the' 5<br />

blocks were left untreated. The fifth block waa see. with viable crabgr'"<br />

seed and not re·treated with chemicals. This was daDe to obtain a truer<br />

picture of residual effects.<br />

All ch~icals were appl't.,a'at the same rat •• ali in 1960. Result' 1!r$<br />

shown in tables 2, 3. and 4. "<br />

Resu1tl in 1961:<br />

TABLEII. Crabgrall Control in Plota Retreated in 1961<br />

Eatlmate<br />

iltbl;l~l. IICI.gt.6»»ll;lt£gO i.QQotEQ1.<br />

Dacthal<br />

Zytron(granular)<br />

Calcium arsenate<br />

Chlordane<br />

Check<br />

2S lbs/2S00 sq.ft'.<br />

6 lbe/1000 aq;ft.<br />

12 lbe/10OO aq.ft.<br />

80 lbs. actu*l/acre<br />

watel"<br />

95<br />

99<br />

99<br />

" 97<br />

(, 0<br />

,.•,<br />

i<br />

"'I<br />

TABLEIII. Residual Effects<br />

Bexbic1da.<br />

Dacthal<br />

Zytron (granular)<br />

Arsenical complex<br />

FHA<br />

Calcium areeDlt.<br />

Zytron Emulsion<br />

in P1~~"ot Retreated 1D(,1~1<br />

Sathlate<br />

, ~~J:Ol~<br />

16<br />

2<br />

15,<br />

1<br />

'(:' , 53<br />

!'j 41<br />

:1' ",

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