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Vol. 16—1962 - NorthEastern Weed Science Society

Vol. 16—1962 - NorthEastern Weed Science Society

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Post-emergence application~. Data from several experimsnt.s<br />

carried out during thesUl11lner of 1960 'are summarized in<br />

Table 2. . .<br />

Table 2: Effects of various 1?ost-emergence treatments en<br />

crabgrass and turf (1960 data}'t<br />

Pot.<br />

Chemical Treatment Date of **<br />

Application<br />

Cyanate<br />

P0t. Cyanate<br />

(repeated sprays)<br />

FVl 734<br />

(Rohm and Haas )<br />

Zytron<br />

Disodium Hethyl<br />

Arsonate<br />

AmmoniumLethyl<br />

Arsonate<br />

*<br />

**<br />

***<br />

~ ~~~ ~:i :<br />

3 oz/3 gal '"<br />

1 oz!3 gal *<br />

2 oZ/3 gal *<br />

2 Ib!IOO gallA<br />

4 Ib/lOO gallA<br />

8 Ib/IOO gal/A<br />

10 Ib!lOO gallA<br />

20 Ib/lOO gallA<br />

30 Ib/IOO gal/A<br />

6 lb/IOO gallA<br />

4 Ib/200 gallA<br />

1<br />

1<br />

1<br />

2,4,5<br />

2,4,5<br />

1,4,5<br />

1<br />

1<br />

4,5<br />

4 2<br />

2,4<br />

2,3,5<br />

Corrt.r-e L<br />

0-4 ***<br />

2<br />

2<br />

:3<br />

4<br />

4<br />

o<br />

1<br />

1<br />

1<br />

:3<br />

4<br />

3<br />

2<br />

Turf<br />

Injury<br />

None<br />

SLBurn<br />

Burned<br />

539'<br />

31.Durn I<br />

Sl.Jurn<br />

None<br />

Sl.:3urn<br />

Burned<br />

Sl.Burn<br />

Burned<br />

Sev.Burn<br />

None<br />

Slight<br />

Applied to 400 sq.ft. only, all rates in terms of active<br />

material.<br />

1 = June 6; 2 = ~une 28; :3 = July 15; 4.= July 25; 5 =Aug.4<br />

a = no control; 4 = 100% control<br />

Good control was produced by potassium' cyanate even at<br />

the lowest rate tested vrhen tr.eatments were repeated 3 times.<br />

T"TOsprays gave fair control but one was not Jsufficient. Temporary<br />

turf burning occurred in all plots. Similar results were<br />

obtained with the arsonates but they were consideraoly slower in<br />

action and not as effe cti ve as cyanate. It "TaSnot.ed that the<br />

effectiveness of ammonium meth¥l arsonate vras increa sed when<br />

applied during a hot day (85°F)<br />

Zytron '.Jurned crabgras$, bent grass and fescue at all<br />

rates and killed them completely in the plots'sprayed ~lith 30 Ib/A.<br />

HO"Tever, the blue-grasses in these plots were strongly stimulated<br />

by the treatment, so that a healthy, dark-green, pure blue-grasq<br />

~ stand of grass was produced. The greater injury to turf from<br />

zytron in the post-emergence plots as compar-ed to the pr-e-emer-gence<br />

may have been nar-t.Lv t,h" """,,"1+ '"f' h';"'h~~ +~,~~~~~ .. ,,-~ _ ...... 1.._ .... ---

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