May/June 2019 - 25

The Potato Association of America mission statement: The PAA and
its allied associations must strongly support the private sector through
Extension, research and commercialization efforts aimed at enhancing
the role of the potato as the premier food source for the 21st century.
Controlling weeds from
planting to row closure
By Pamela J.S. Hutchinson
Potato Association of America
F
rom potato planting to row closure is a busy time for
growers. It's also a busy time for weeds. Getting the
herbicides on at the right time and linking up with
tillage operations between planting and row closure is the key
for weed control from start to finish. Time from planting to
emergence can be three to four weeks and, from emergence
to row closure, four to five weeks.
Here's why timing matters.
University of Idaho research shows that a 5% or greater
U.S. No. 1 yield loss will occur if hairy nightshade is not
controlled from a few days after potato emergence to 22
days later (two hairy nightshades per meter row) If only one
per row competes all season-long, then as much as 21% U.S.
No. 1 yield is lost.
* Using an integrated weed management strategy will provide
the best weed control in potatoes: cultural, mechanical,
chemical and biological tools available for weed control,
rather than relying on any single weed control tool.
There are different approaches to tillage-timing out there
and this article will concentrate on two. Both use a hilling/
reservoir tillage operation.
* Reservoir tillage is sometimes referred to by one of the
brand names, Dammer Diker.
* For both scenarios, the reservoir tillage equipment is set up
to hill at the same time.
* Some operators attach a sprayer to the back of the tillage
equipment and sprinkler-incorporate the herbicides
(Figure 1).
* Regardless
of scenario, the hilling-reservoir tillage
operation is the last one to be performed until harvest.
READ AND FOLLOW THE HERBICIDE LABEL
Tank mix herbicides with different mechanisms of action
in order to attain broad spectrum weed control and prevent
or delay the development of herbicide-resistant weed
populations. Design herbicide tank-mixes to target the weeds
present in a given field. Rotate herbicide mechanisms of
action from year to year.
SCENARIO 1
" Drag-off " before potato emergence and a " hillingreservoir
tillage " operation after potato emergence.
Postemergence herbicides are applied after that hilling.
See Figure 2.
Spudman * May/June 2019
25
Figure 2. Scenario 1: Drag-off before potato emergence and hillingreservoir
tillage after potato emergence. Herbicides are applied
after that hilling. A second postemergence spray may be necessary.
Figure 1. Reservoir tillage/hilling equipment with and without
sprayer attached; reservoir tillage " divots " in the field.

May/June 2019

Table of Contents for the Digital Edition of May/June 2019

May/June 2019 - 1
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https://www.nxtbook.com/greatamericanmediaservices/SPUD/november-december-2021
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