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Vol. 16—1962 - NorthEastern Weed Science Society

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(<br />

(<br />

~able 2. Effect of Several Che~~cals Used for Vine Killing on Kennebec Potatoes _<br />

Aroostook Farm - 196o!1<br />

Desiccant<br />

to trea merit<br />

lodium ar-aenf te<br />

II<br />

u<br />

II<br />

~onlum<br />

It<br />

"<br />

thiocyanate<br />

Rate/acre<br />

8 Lba , (AS203)<br />

8 1bs.(As203)<br />

8 Lbs , (As203)<br />

8 Ibs. (As203 )<br />

~6<br />

5%<br />

7i'f,<br />

Activator<br />

Killi}W<br />

index.=t<br />

1<br />

5<br />

*gal. sodium<br />

silicate 5<br />

1 gal. sodium<br />

silicate 4<br />

It gals. sodium<br />

S11icate<br />

3 oz. sUlfonated<br />

4<br />

Tl.i1:>er<br />

color,,/<br />

index.V inde~<br />

0.0 4.6<br />

2.1 4.2<br />

discolorat~on<br />

1.6<br />

1.4<br />

2.9<br />

chip<br />

activator 523.9 5.8<br />

3 oz. sUlfona ted • .<br />

activator 5 57.1 6.4<br />

3 oz. sulfonated<br />

activator 5 56.4 6.6<br />

3 oz. sulfonated<br />

If<br />

10%<br />

, aotivator ~ 59.6 1.2<br />

~enta-Chlorophenol 2.1bS' GR-7 plus acetone .o'.a. ~.2:.<br />

n 2 Lbs , 5 gals. fuel oil 1.8.2<br />

u>se~c acid 2 pts. 3' 0.0 .7<br />

.. 3pts. .1.5 .• 2<br />

n 4 pts. 5 -4.3 -4.4<br />

~ethy\ated Naptha1ene i gals. 4 oz. ftlyac 1 - 0.5 ,h.ll<br />

gals. 2 0.5 4.0<br />

n gals. n ~ 0.5 u.o<br />

ieglone (diquat) 2 U>S;, 11 5 15.8 4.5<br />

n 4 1bs. " 5 23.7 4.4<br />

n 6 Ibs. " 5 30.2 4.4<br />

Materials applied August 23. 1960 in 90 gallons of water per acre.<br />

Kill ratings were made at 10 and 14 days after materials applied.<br />

Discoloration readings made on January 23. 1961.<br />

Read on N.P.C.l. Color- Chart l=ligl:lt: :to=de,rk.<br />

4.2<br />

4.5<br />

6.1<br />

t:;<br />

""

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