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Vol. 16—1962 - NorthEastern Weed Science Society

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Table 1. Errect or Several Ch~cals Used ror Vine Killing on Katahdin Potatoes<br />

Aroostook Farm - 196o!1<br />

.....<br />

-.0<br />

~<br />

Desiccant<br />

No treatment<br />

Sodium arsenite<br />

It<br />

\I<br />

Premerge<br />

Ammoniumthiocyanate<br />

Rate/acre<br />

8 Ibs.(AS203)<br />

It,<br />

2 qts.<br />

~<br />

\I<br />

Activator<br />

Sodium silicate<br />

Ii gals.<br />

40z.Plyac<br />

5 gals. ruel 011-<br />

KilliA&<br />

ind~<br />

4 3<br />

1<br />

3<br />

Tuber'~Ch1p<br />

diSColo::!70n<br />

ind .<br />

color,,}<br />

index.:tl<br />

0.3iji.E<br />

0.2 S.O<br />

0.0<br />

0.5<br />

4 oz. Plyac 2 . {).6<br />

3 oz. sulronated . ..<br />

activator 5 5.8 1.8<br />

Penta-Chlorophenol 2 Ibs. 5 gals. ruel oil 3 0.8 5.2<br />

Arsenic acid 2 pts. 4 oz. Plyac 3 0.0 5.0<br />

Methylated Napthalene 6 gals. 4 oz. Plyac 10.04.8<br />

Reglone (diquat) 2 Lbs , 4 oz. Pl;yac 5 6.0 6.3<br />

11 Materials applied August 30, 1960.<br />

51 Relative rating used ror vine killing.<br />

1. Poor kill or both stems and leaves.<br />

2. Most leaves killed but poor stem kill.<br />

3. All leaves killed and poor stell kill.<br />

4. All leaves killed and rair stem kill.<br />

5. Good kill or both leaves and stems.<br />

J! Discoloration readings made on January 25, 1961.<br />

y/ Read on N.P.C.l. Color Chart l=light: lO=dark.<br />

5.2<br />

5.2<br />

6.2<br />

l (

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