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Vol. 16—1962 - NorthEastern Weed Science Society

Vol. 16—1962 - NorthEastern Weed Science Society

Vol. 16—1962 - NorthEastern Weed Science Society

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Crabgrass Control and Turf InjUry'·- Established ''l\irf<br />

i~.<br />

ZiY'tron (Dow Crabgrass Killer) and dacthal (Rid) gave 96%and 100% control)<br />

respectively. When double the recommended rate was used, 100%control<br />

was obtained with both materials. However, 8'l1ght to moderate turf<br />

injury occurred when these rates Were used (zytrolt' caused some thinning of<br />

the turf at the normal rate ofappl1cation). 'l\u'(;:1njury, in this case, '<br />

was expressed by the failure of the red fescue and'bentgrass populations to<br />

fully recover following the pre-application thinnfUei and mowing treatments.<br />

491<br />

The same materials used in experimental triaJ,.s on establisHed turf<br />

were also used in the pre-emer~nce crabgrass cort~ol trials on poor turf.<br />

The results were similar to that which occurred on 'established turf, although<br />

in some cesea, the reduction in crabgrass populations was not as great. The<br />

most notable exel!1Ples of this were ,With chlordane-{Halts) and with the t<br />

arsenical-fertilizer formula.tion (Pax). Crabgrass control with chlordane<br />

was reduced from 91%in established turf to 61%in the poor turf areas, with<br />

a similar decrease (95%to 7l'{o) observed for the e..rselilical-fertilizer fQ1'IIlUlation<br />

(Pax). Calcium propyl arsonate (No-Crab) tUid diphenatrile (Agrico<br />

crabgrass control) gave n greater crabgrass control, than that found in

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