February 2024 - 15

DISEASE & WEED CONTROL
(WE) FIND OURSELVES
RECOMMENDING MORE SOIL-APPLIED
HERBICIDES TO MANAGE HERBICIDERESISTANT
WEEDS. WHEN THOSE
SOIL-APPLIED HERBICIDES DON'T
WORK WELL, IT'S OFTEN DIFFICULT
TO TELL WHETHER THE WEEDS HAVE
STARTED TO EMERGE BEFORE THE
HERBICIDE GOT ACTIVATED.
- Albert Adjesiwor
production such as wheat, barley and oats, although
they can be a problem for other crops.
However, the research model can be expanded and
applied to other crops, including specialty crops, from
potatoes to tree fruit.
" Once we are done with these first round of studies,
we will expand this to other common and problematic
weeds in our region, " Adjesiwor said. " It has a bit of
application to other crops. Weeds like Italian ryegrass
have been problematic in orchards, fruit and vegetable
(production) in states like Oregon. "
The thermogradient table allows weeds to germinate
under the same conditions but a range of temperatures,
with the study focusing on extremes of 41-104° F.
" The table has cooling and heating units, with
conducting 'lines' running under a polished steel plate, "
he said. " We set the lowest and highest temperature,
and the table creates a temperature gradient from
the front to the back of the table, between the low and
high temperatures. "
Plant species have different germination temperature
requirements, and sometimes the same species
collected from different regions or crop situations vary
in the conditions needed to germinate, Adjesiwor said.
Chandra Maki, Adjesiwor's doctoral student, is
leading the study for her weed science dissertation.
" We know there are substantial differences in
temperature - heat accumulation, growing degree
days - and moisture across the (Pacific Northwest) "
she said in a UI news release. " We expect specific
weeds from different conditions to behave a bit
differently and this project would help us assess and
map these differences. "
Herbicide resistance
Adjesiwor said addressing weed resistance to herbicides
is not solved by applying more herbicides. It's just a
matter of time before nature will find a way to circumvent
the chemicals' process of attacking plants. By studying
the conditions that trigger the germination of weed
seeds, researchers are going " back to basics, " he said.
VEGETABLEGROWERSNEWS.COM | 15
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February 2024

Table of Contents for the Digital Edition of February 2024

Editor's Letter
Michigan Vegetable Council honors experts
GLEXPO Bus Tour
2023 Fruit + Vegetable 40 Under 40 awards
A different tool in fighting herbicide resistance
Going greens
Replacing plastic with cover crops
Farm Market & Agritourism
Classifieds
Advertiser Index
February 2024 - 1
February 2024 - 2
February 2024 - Editor's Letter
February 2024 - 4
February 2024 - 5
February 2024 - Michigan Vegetable Council honors experts
February 2024 - 7
February 2024 - GLEXPO Bus Tour
February 2024 - 9
February 2024 - 10
February 2024 - 11
February 2024 - 2023 Fruit + Vegetable 40 Under 40 awards
February 2024 - 13
February 2024 - A different tool in fighting herbicide resistance
February 2024 - 15
February 2024 - 16
February 2024 - 17
February 2024 - Going greens
February 2024 - 19
February 2024 - 20
February 2024 - 21
February 2024 - 22
February 2024 - 23
February 2024 - Replacing plastic with cover crops
February 2024 - 25
February 2024 - 26
February 2024 - 27
February 2024 - 28
February 2024 - 29
February 2024 - Farm Market & Agritourism
February 2024 - 31
February 2024 - Classifieds
February 2024 - 33
February 2024 - Advertiser Index
February 2024 - 35
February 2024 - 36
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