Abstract
Currently, there are no effective herbicides registered for the control of hoary cress ( Cardaria draba ) in alfalfa ( Medicago sativa ) or alfalfa/grass mixtures. Due to this lack of control options, field experiments were conducted near St. Ignatius, MT, from 1995 through 1997 to determine the optimum imazethapyr rate and adjuvant combination for hoary cress control in alfalfa/orchardgrass ( Dactylis glomerata ) pastures. Imazethapyr was applied in the spring to rosette stage hoary cress plants at 33, 67, and 100 g ai/ha with either a nonionic surfactant or methylated seed oil alone or combined with 28% urea ammonium nitrate (UAN) liquid fertilizer. Hoary cress control was poorest when imazethapyr was applied at 33 g/ha, yet provided a minimum of 80% control. Imazethapyr applied at 67 and 100 g/ha provided greater than 90% control during the year of application regardless of surfactant or UAN additions. None of the treatments controlled hoary cress the year following application. Alfalfa yield was unaffected by imazethapyr applications. First-cutting orchardgrass yield decreased as imazethapyr rate increased, but total seasonal forage yield was unaffected.
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Claims 7
Claim · model-written summary
The 33 g/ha rate gave the poorest hoary cress control, at least 80%.
- Taxon
- alfalfa
Medicago sativat0 - Treatment
- imazethapyr was applied at 33 g/hae0
- Interactor
- hoary cress
Lepidium drabae0weed - Outcome
- Hoary cress controle0
- Direction
- pooreste0
- Value
- 80%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Hoary cress control was poorest when imazethapyr was applied at 33 g/ha, yet provided a minimum of 80% control.”
t0“alfalfa ( Medicago sativa )”
Claim · model-written summary
The 67 g/ha rate controlled hoary cress by over 90% during application year.
- Taxon
- alfalfaMedicago sativae1
- Treatment
- Imazethapyr applied at 67e0
- Interactor
- hoary cressLepidium drabat0weede0
- Outcome
- controle0
- Direction
- greater thane0
- Value
- 90%e0
- Qualifier
- during the year of applicatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Imazethapyr applied at 67 and 100 g/ha provided greater than 90% control during the year of application regardless of surfactant or UAN additions.”
t0“Hoary Cress (Cardaria draba) Management with Imazethapyr”
e1“alfalfa ( Medicago sativa )”
Claim · model-written summary
The 100 g/ha rate controlled hoary cress by over 90% during application year.
- Taxon
- alfalfaMedicago sativae1
- Treatment
- 100 g/hae0
- Interactor
- Hoary CressLepidium drabat0weede0
- Outcome
- controle0
- Direction
- greater thane0
- Value
- 90%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Imazethapyr applied at 67 and 100 g/ha provided greater than 90% control during the year of application regardless of surfactant or UAN additions.”
t0“Hoary Cress (Cardaria draba) Management with Imazethapyr”
e1“alfalfa ( Medicago sativa )”
Claim · model-written summary
Treatments did not control hoary cress the following year.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- treatmentse0
- Interactor
- hoary cressLepidium drabae0weed
- Outcome
- controlled hoary cresse0
- Qualifier
- the year following applicatione0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“None of the treatments controlled hoary cress the year following application.”
t0“alfalfa ( Medicago sativa )”
Claim · model-written summary
Imazethapyr did not alter alfalfa yield.
- Taxon
- AlfalfaMedicago sativae0
- Treatment
- imazethapyr applicationse0
- Outcome
- Alfalfa yielde0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alfalfa yield was unaffected by imazethapyr applications.”
Claim · model-written summary
First cutting orchardgrass yield fell with increasing imazethapyr rate.
- Taxon
- orchardgrass
.jpg?width=60)
Dactylis glomeratae0 - Treatment
- imazethapyr ratee0
- Outcome
- First-cutting orchardgrass yielde0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“First-cutting orchardgrass yield decreased as imazethapyr rate increased”
Claim · model-written summary
Total seasonal forage yield was unaffected.
- Taxon
- alfalfaMedicago sativae1
- Treatment
- Imazethapyrt0
- Outcome
- total seasonal forage yielde0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“total seasonal forage yield was unaffected.”
t0“Hoary Cress (Cardaria draba) Management with Imazethapyr”
e1“alfalfa ( Medicago sativa )”
The same questions in other papers
Imazethapyr · yield · Medicago sativa (alfalfa)Results differ
2 papers in the same direction as this paper · 6 in the opposite direction
- positive
- positive
- positive
5 papers more in this group
See all 9 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.