Spudman March 2023 - 16

Injury when Outlook preemergence application is followed by
6 inches simulated rainfall. The plants recovered, and there was
no yield loss. Photos: Pamela Hutchinson, University of Idaho
Prowl H2O applied preemergence at two times the labeled rate
followed by 6 inches simulated excess rainfall. Damage shows
symptoms of stubby roots and twisted, bent stems below ground.
Mystery symptoms
after heavy rains
Unpredictable excess rainfall can push herbicides too far down in the soil
By Crystal Nay
MANAGING EDITOR
E
16
ach year in late spring to early summer, Pamela
Hutchinson, potato cropping systems weeds science
research and Extension specialist with University
of Idaho (U of I), gets called out to farms to help potato
growers investigate crop injury. The suspicion often points to
herbicides - maybe from carryover in the soil, drift from an
adjacent field, or possibly from herbicides applied that year.
It's not terribly out of the ordinary.
But within the last five years, there have been multiple
instances of unusual, excess rainfall during a period of two to
Spudman * March 2023
three weeks after application of preemergence herbicides -
up to 5 inches in southwest Idaho in 2019 - and the injury
symptoms just didn't appear as they typically had in years past.
" I wanted to do research in a controlled environment so
I could see what exactly happens when there's three inches,
or even six excess inches, of rainfall after farmers put their
herbicides on potatoes, " said Hutchinson.
And so the trials began at U of I's Aberdeen Research and
Extension Center, where Hutchinson can apply 1x and 2x the
application rate to " make sure we can see something if we're
going to see something, " she said.
After the herbicides were applied preemergence, irrigation
was run at regular rates for sprinkler incorporation, and then

Spudman March 2023

Table of Contents for the Digital Edition of Spudman March 2023

Spudman March 2023 - 1
Spudman March 2023 - 1A
Spudman March 2023 - 2A
Spudman March 2023 - 2
Spudman March 2023 - 3
Spudman March 2023 - 4
Spudman March 2023 - 5
Spudman March 2023 - 6
Spudman March 2023 - 7
Spudman March 2023 - 8
Spudman March 2023 - 9
Spudman March 2023 - 10
Spudman March 2023 - 11
Spudman March 2023 - 12
Spudman March 2023 - 13
Spudman March 2023 - 14
Spudman March 2023 - 15
Spudman March 2023 - 16
Spudman March 2023 - 17
Spudman March 2023 - 18
Spudman March 2023 - 19
Spudman March 2023 - 20
Spudman March 2023 - 21
Spudman March 2023 - 22
Spudman March 2023 - 23
Spudman March 2023 - 24
Spudman March 2023 - 25
Spudman March 2023 - 26
Spudman March 2023 - 27
Spudman March 2023 - 28
Spudman March 2023 - 29
Spudman March 2023 - 30
Spudman March 2023 - 31
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Spudman March 2023 - 33
Spudman March 2023 - 34
Spudman March 2023 - 35
Spudman March 2023 - 36
Spudman March 2023 - 37
Spudman March 2023 - 38
Spudman March 2023 - 39
Spudman March 2023 - 40
Spudman March 2023 - 41
Spudman March 2023 - 42
Spudman March 2023 - 43
Spudman March 2023 - 44
https://www.nxtbook.com/greatamericanmediaservices/SPUD/april-2024
https://www.nxtbook.com/greatamericanmediaservices/SPUD/march-2024
https://www.nxtbook.com/greatamericanmediaservices/SPUD/february-2024
https://www.nxtbook.com/greatamericanmediaservices/SPUD/spudman-january-2024
https://www.nxtbook.com/greatamericanmediaservices/SPUD/spudman-november-december-2023
https://www.nxtbook.com/greatamericanmediaservices/SPUD/spudman-september-october-2023
https://www.nxtbook.com/greatamericanmediaservices/SPUD/spudman-july-august-2023
https://www.nxtbook.com/greatamericanmediaservices/SPUD/spudman-may-june-2023
https://www.nxtbook.com/greatamericanmediaservices/SPUD/spudman-april-2023
https://www.nxtbook.com/greatamericanmediaservices/SPUD/spudman-march-2023
https://www.nxtbook.com/greatamericanmediaservices/SPUD/spudman-february-2023
https://www.nxtbook.com/greatamericanmediaservices/SPUD/spudman-january-2023
https://www.nxtbook.com/greatamericanmediaservices/SPUD/spudman-november-december-2022
https://www.nxtbook.com/greatamericanmediaservices/SPUD/spudman-september-october-2022
https://www.nxtbook.com/greatamericanmediaservices/SPUD/spudman-july-august-2022
https://www.nxtbook.com/greatamericanmediaservices/SPUD/may-june-2022
https://www.nxtbook.com/greatamericanmediaservices/SPUD/april-2022
https://www.nxtbook.com/greatamericanmediaservices/SPUD/march-2022
https://www.nxtbook.com/greatamericanmediaservices/SPUD/february-2022
https://www.nxtbook.com/greatamericanmediaservices/SPUD/january-2022
https://www.nxtbook.com/greatamericanmediaservices/SPUD/november-december-2021
https://www.nxtbook.com/greatamericanmediaservices/SPUD/september-october-2021
https://www.nxtbook.com/greatamericanmediaservices/SPUD/july-august-2021
https://www.nxtbook.com/greatamericanmediaservices/SPUD/may-june-2021
https://www.nxtbook.com/greatamericanmediaservices/SPUD/april-2021
https://www.nxtbook.com/greatamericanmediaservices/SPUD/march-2021
https://www.nxtbook.com/greatamericanmediaservices/SPUD/february-2021
https://www.nxtbook.com/greatamericanmediaservices/SPUD/january-2021
https://www.nxtbook.com/greatamericanmediaservices/SPUD/november-december-2020
https://www.nxtbook.com/greatamericanmediaservices/SPUD/september-october-2020
https://www.nxtbook.com/greatamericanmediaservices/SPUD/july-august-2020
https://www.nxtbook.com/greatamericanmediaservices/SPUD/may-june-2020
https://www.nxtbook.com/greatamericanmediaservices/SPUD/april-2020
https://www.nxtbook.com/greatamericanmediaservices/SPUD/march-2020
https://www.nxtbook.com/greatamericanmediaservices/SPUD/february-2020
https://www.nxtbook.com/greatamericanmediaservices/SPUD/january-2020
https://www.nxtbook.com/greatamericanmediaservices/SPUD/november-december-2019
https://www.nxtbook.com/greatamericanmediaservices/SPUD/september-october-2019
https://www.nxtbook.com/greatamericanmediaservices/SPUD/july-august-2019
https://www.nxtbook.com/greatamericanmediaservices/SPUD/may-june-2019
https://www.nxtbook.com/greatamericanmediaservices/SPUD/april-2019
https://www.nxtbook.com/greatamericanmediaservices/SPUD/march-2019
https://www.nxtbook.com/greatamericanmediaservices/SPUD/february-2019
https://www.nxtbook.com/greatamericanmediaservices/SPUD/basf-2019
https://www.nxtbook.com/greatamericanmediaservices/SPUD/january-2019
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