Vol. 16—1962 - NorthEastern Weed Science Society

soil temperatures at the time the materials were applied to the
Kennebec vines.
Table 3 shows the effect of several rates of sodium arsonite
and of premerge on rate of k~ll and tuber discoloration. Rates
of sodium arsenito above six pounds per acro, and Premerge at tho
2 quart rate caused considerable internal disooloration. Same
of this internal vascular discoloration is not caused specifioally
and only by the chemioals tested but appears to be associated with
death of tops, whethor doathl& brought abQut by chomioals, or
mechanically by vino boaters, or even by drenohing with ice water.
Of tho fivo new matorials tested in 196o-6~ Reglone, known
commercially in the United S~ates a~ Diquat, and ammonium thiocyanate
are ~rthy of f~thor testing.
191