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Vol. 16—1962 - NorthEastern Weed Science Society

Vol. 16—1962 - NorthEastern Weed Science Society

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326<br />

Atrazineappl1ed as- a post-etnergence treatmentwllen the nutgrass was I<br />

2 inches high with some old plants up to 6 inches resulted in excellent control<br />

at 3, 4 and 5 pounds per acre. 'lhl!)'ie1ds were aign,t£:icant1y increased at',<br />

all rates. '. J '<br />

§UMMARY<br />

The resufts of three years of work wIth nutgrass control chemicals<br />

indicates that the carbamate materials have promise. The use of EPTCat<br />

6 pounds did result in decreased yields in 1961 butth~ R-1870 used in 196~<br />

appears to be very promising. Thti advantage of these materials is that they<br />

do not have a residue problem in tbe~uceeding crop.<br />

As many investigators have Showit',the use of Atrazine at rates exceeding<br />

2 pounds precludes the growing of anything but corn the follol-Ting year. In<br />

order to obtain satisfactory nutgrass control with Atrazine a rate of 4 pounds<br />

pre-emergence or post-emergence is necessary. If anutgrass stand does appear<br />

in corn then 4 pounds as a post-emergence treatment will give excellent<br />

control.

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