| Material Information
||Potato vine killers
||1 leaf : ; 28 cm.
||Harkness, R. W
Sub-Tropical Experiment Station
||University of Florida, Sub-Tropical Experiment Station
||Place of Publication:
||Potatoes -- Diseases and pests -- Florida ( lcsh )
||government publication (state, provincial, terriorial, dependent) ( marcgt )
non-fiction ( marcgt )
||Statement of Responsibility:
||Mimeographed report (Sub-Tropical Experiment Station) ;
| Record Information
||University of Florida
||All rights reserved by the source institution and holding location.
||oclc - 71816567
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Copyright 2005, Board of Trustees, University
University of Florida
SUB-TROPICAL EXPERIMENT STATION
POTATO VINE KILLERS
R. W. Harkness
no longer be
Mimeographed Report No. SUB-70-2
Rule 7E-376 Florida Administrative Code, sodium arsenite may
used for potato vine killing. The following materials however,
DNPB (Sinox, Premerge)
Maximum rate approved
2.0 lbs actual per acre
2.5 lbs actual per acre
0.5 Ibs actual per acre
Various rates of these materials were tested in March 1967 and again in
March, 1968. About 40 gal. of water per acre were used. Some treatments
included 0.4% of the volume of the solution as wetting agents, other
treatments had none.
After eight days, nearly complete kill (at least 95% of the leaves and 80%
of the stems) was obtained with 0.5 to 2.0 lbs ametryne, 0.25 to 0.5 Ib
paraquat plus wetting agent, or 1.0 to 4.0 Ib DNPB plus wetting agent and
5.0 gal. diesel oil. Within those ranges, there was little influence of
rate on effectiveness so apparently the lowest of each of those rates would
be satisfactory. Omission of the wetting agent with 0.25 Ib paraquat re-
sulted in slightly less kill (90% of the leaves and 70% of the stem).
Omission of the wetting agent with the ametryne did not seem to affect the
kill but these results were somewhat inconsistent. DNPB was always tried
with both diesel oil'and wetting agent. Paraquat at 0.125 lb (0.5 pint)
plus wetting agent gave a kill of less than 90% of the leaves and 70% of the
stems. Lower rates were not tried with the other materials. DNPB killed
most of the vines in the first two days, while ametryne required at least
six days. The paraquat rate of kill was intermediate.
In these experiments none of the materials caused darkening or necrosis
or other evidence of injury to the tubers.
Based on these results it appears that any one of these materials would be
a satisfactory substitute for sodium arsenite.
.S 1 1972
I.F.A.S. Univ. of Florida