Citation
Potato vine killers

Material Information

Title:
Potato vine killers
Series Title:
Mimeographed report
Creator:
Harkness, R. W
Sub-Tropical Experiment Station
Place of Publication:
Homestead Fla
Publisher:
University of Florida, Sub-Tropical Experiment Station
Publication Date:
Language:
English
Physical Description:
1 leaf : ; 28 cm.

Subjects

Subjects / Keywords:
Potatoes -- Diseases and pests -- Florida ( lcsh )
Wetting ( jstor )
Vines ( jstor )
Genre:
government publication (state, provincial, terriorial, dependent) ( marcgt )
non-fiction ( marcgt )

Notes

General Note:
"February, 1970."
Funding:
Mimeographed report (Sub-Tropical Experiment Station) ;
Statement of Responsibility:
R.W. Harkness.

Record Information

Source Institution:
University of Florida
Rights Management:
All applicable rights reserved by the source institution and holding location.
Resource Identifier:
71816567 ( OCLC )

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HISTORIC NOTE


The publications in this collection do
not reflect current scientific knowledge
or recommendations. These texts
represent the historic publishing
record of the Institute for Food and
Agricultural Sciences and should be
used only to trace the historic work of
the Institute and its staff. Current IFAS
research may be found on the
Electronic Data Information Source
(EDIS)

site maintained by the Florida
Cooperative Extension Service.






Copyright 2005, Board of Trustees, University
of Florida






U


University of Florida
SUB-TROPICAL EXPERIMENT STATION
Homestead, Florida


POTATO VINE KILLERS

R. W. Harkness


According to
no longer be
are approved


Mimeographed Report No. SUB-70-2


Rule 7E-376 Florida Administrative Code, sodium arsenite may
used for potato vine killing. The following materials however,
for use.


Ametryne
DNPB (Sinox, Premerge)
Paraquat


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.


February, 1970



HUME LIBRARY


.S 1 1972


I.F.A.S. Univ. of Florida


~~VVI~