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Vol. 16—1962 - NorthEastern Weed Science Society

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Table 1. Besu):ta.Qf 1961 pre-emergence ~s con~ trtals':Q()rneU ....assau COunty Park Turigrass 1<br />

~1ication: March 29, 1961 Ii1jury ratings: _ 31, 1961 Control ratings: July 25, 1961<br />

Plots: 7 x 7' Established turf: 3 replications Poor turf: 4 replications<br />

Proprietary material Acti ve ingr~ent<br />

1. Chip-~' 'grtmular calcium arsenate<br />

';) .<br />

;~l .(1<br />

2. Halts<br />

3. Pax<br />

4. Bo'-Crab<br />

'5· .Agt'1cp~grass<br />

"~.roi -,<br />

6. Rid<br />

7. Dow Crabgrass<br />

Killer<br />

Percentcra'Qgrass in check<br />

ch1~ ~i reie.teei~CBIIP01J!fI'f~ '~ 0' .. ,<br />

d1P~llearsenical<br />

calcium<br />

propyl<br />

dacthaJ.<br />

zytron<br />

cOJllPOU1lds<br />

ar80nate<br />

Pounds of<br />

Formulation!M<br />

15<br />

~6/<br />

20<br />

5<br />

10<br />

10<br />

~<br />

, 10<br />

20<br />

B<br />

16<br />

Established turf Poor t1l<br />

'.J 1 Injury 2 ~<br />

Control Ratings Control<br />

99 100 96<br />

.\. "_. -r-.,~ ..." '.-1<br />

• ; ~<<br />

~ '; o.o .Ell<br />

95 1.0 71<br />

2 0.0 25<br />

2l 0.0<br />

40 0.0 69<br />

87 ~.3 --<br />

100 0.0 98<br />

100 1·7<br />

96 0.7 99<br />

100 2.0 --<br />

I<br />

'90<br />

0<br />

0"<br />

-:t<br />

l.<br />

2.<br />

Percent crabgrass cont'ro1 calculated on the basil3 of' averagenulliber of plants per square foot in ·chec<br />

at the time of estimating; average of' 9 l;lamp1es,_3 o~e square foot samples per replicate.<br />

TUrf injury ratings: O-none; 1-slight; 2-modera'tej3'-severe; 4-comp1ete }till.<br />

3· Percent control based on estimates of percent crabgrass in checks at time of estimating.

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