Abstract
A study was established to evaluate weed control and crop response of imidazolinone-tolerant (IMI-tolerant) rice in water-seeded culture with imazethapyr at 70, 105, and 140 g ai/ha at four different soil application timings with or without 70 g/ha imazethapyr postemergence (POST). Application timings included preplant incorporated (PPI), surface application prior to seeding (SURFACE), following seeding (SEED), and at pegging (PEG). The PEG treatments were applied when green leaf tissue had emerged from the seed and the root had begun to extend downward into the soil. Response of barnyardgrass, red rice, and rice injury was not affected by the addition of an imazethapyr POST application. Barnyardgrass control was above 90% at 28 d after treatment (DAT) for both years. At 42 DAT, barnyardgrass control decreased to 88% in 1998, compared with 94% control in 1999. Averaged over years, Indian jointvetch control ranged from 44 to 74% at 28 DAT and 41 to 71% at 42 DAT. Indian jointvetch control was inconsistent and lacked uniformity over all factors. Rice injury increased as application timing was delayed from PPI to PEG in 1998 at both rating dates. In 1999, injury was not observed with imazethapyr at 28 DAT, and 1% injury was observed at 42 DAT with all imazethapyr application timings.Nomenclature: Imazethapyr; Barnyardgrass, Echinochloa crus-galli (L.) Beauv. #3 ECHCG; Indian jointvetch, Aeschynomene indica L. # AESIN; rice Oryza sativa L, ‘93 AS-3510’.Additional index words: ALS, acetolactate synthase, Clearfield rice, soil-applied herbicide.Abbreviations: ALS, acetolactate synthase (E.C. 4.1.3.18); DAT, d after POST treatment; IMI-tolerant, imidazolinone-tolerant; PEG, pegging; POST, postemergence; PPI, preplant incorporated; PRE, preemergence; SEED, following seeding; SURFACE, surface application prior to seeding.
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Claims 9
Claim · model-written summary
Imazethapyr gave barnyardgrass control above 90% at 28 DAT in both years.
- Taxon
- rice
Oryza sativae0 - Treatment
- imazethapyr at 70, 105, and 140 g ai/hae0
- Interactor
- Barnyardgrass
Echinochloa crus-gallie1weed - Outcome
- Barnyardgrass controle1
- Direction
- abovee1
- Value
- 90%e1
- Qualifier
- for both yearse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“evaluate weed control and crop response of imidazolinone-tolerant (IMI-tolerant) rice in water-seeded culture with imazethapyr at 70, 105, and 140 g ai/ha”
e1“Barnyardgrass control was above 90% at 28 d after treatment (DAT) for both years”
Claim · model-written summary
Barnyardgrass control decreased to 88% at 42 DAT in 1998, compared with 94% in 1999.
- Taxon
- riceOryza sativae0
- Treatment
- imazethapyr at 70, 105, and 140 g ai/hae0
- Interactor
- barnyardgrassEchinochloa crus-gallie1weed
- Outcome
- barnyardgrass controle1
- Direction
- decreasede1
- Value
- 88%e1
- Qualifier
- compared with 94% control in 1999e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“evaluate weed control and crop response of imidazolinone-tolerant (IMI-tolerant) rice in water-seeded culture with imazethapyr at 70, 105, and 140 g ai/ha”
e1“At 42 DAT, barnyardgrass control decreased to 88% in 1998, compared with 94% control in 1999”
Claim · model-written summary
Indian jointvetch control ranged from 44 to 74% at 28 DAT, averaged over years.
- Taxon
- riceOryza sativae0
- Treatment
- imazethapyr at 70, 105, and 140 g ai/hae0
- Interactor
- Indian jointvetche1weed
- Outcome
- Indian jointvetch controle1
- Value
- 44 to 74%e1
- Qualifier
- at 28 DATe1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“evaluate weed control and crop response of imidazolinone-tolerant (IMI-tolerant) rice in water-seeded culture with imazethapyr at 70, 105, and 140 g ai/ha”
e1“Averaged over years, Indian jointvetch control ranged from 44 to 74% at 28 DAT and 41 to 71% at 42 DAT”
Claim · model-written summary
Indian jointvetch control ranged from 41 to 71% at 42 DAT, averaged over years.
- Taxon
- riceOryza sativae0
- Treatment
- imazethapyr at 70, 105, and 140 g ai/hae0
- Interactor
- Indian jointvetche1weed
- Outcome
- Indian jointvetch controle1
- Value
- 41 to 71%e1
- Qualifier
- at 42 DATe1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“evaluate weed control and crop response of imidazolinone-tolerant (IMI-tolerant) rice in water-seeded culture with imazethapyr at 70, 105, and 140 g ai/ha”
e1“Averaged over years, Indian jointvetch control ranged from 44 to 74% at 28 DAT and 41 to 71% at 42 DAT”
Claim · model-written summary
Indian jointvetch control was inconsistent and lacked uniformity over all factors.
- Taxon
- riceOryza sativae0
- Interactor
- Indian jointvetche1weed
- Outcome
- Indian jointvetch control was inconsistent and lacked uniformity over all factorse1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“evaluate weed control and crop response of imidazolinone-tolerant (IMI-tolerant) rice in water-seeded culture with imazethapyr at 70, 105, and 140 g ai/ha”
e1“Indian jointvetch control was inconsistent and lacked uniformity over all factors”
Claim · model-written summary
Barnyardgrass, red rice and rice injury were not affected by adding a POST imazethapyr application.
- Taxon
- riceOryza sativae0
- Treatment
- imazethapyr POST applicatione0
- Interactor
- barnyardgrassEchinochloa crus-gallie0weed
- Second interactor
- red ricee0weed
- Outcome
- response of barnyardgrass, red rice, and rice injurye0
- Direction
- not affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Response of barnyardgrass, red rice, and rice injury was not affected by the addition of an imazethapyr POST application”
Claim · model-written summary
Rice injury increased as application timing was delayed from PPI to PEG in 1998.
- Taxon
- RiceOryza sativae0
- Treatment
- application timinge0
- Outcome
- Rice injurye0
- Direction
- increasede0
- Qualifier
- at both rating datese0
- Comparator
- PPIe0
- Setting
- 1998e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice injury increased as application timing was delayed from PPI to PEG in 1998 at both rating dates”
Claim · model-written summary
In 1999, no rice injury was observed with imazethapyr at 28 DAT.
- Taxon
- riceOryza sativae0
- Treatment
- imazethapyre1
- Outcome
- injurye1
- Qualifier
- at 28 DATe1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“evaluate weed control and crop response of imidazolinone-tolerant (IMI-tolerant) rice in water-seeded culture with imazethapyr at 70, 105, and 140 g ai/ha”
e1“In 1999, injury was not observed with imazethapyr at 28 DAT”
Claim · model-written summary
In 1999, 1% rice injury was observed at 42 DAT with all imazethapyr application timings.
- Taxon
- riceOryza sativae0
- Treatment
- imazethapyr application timingse1
- Outcome
- injurye1
- Value
- 1%e1
- Qualifier
- at 42 DATe1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“evaluate weed control and crop response of imidazolinone-tolerant (IMI-tolerant) rice in water-seeded culture with imazethapyr at 70, 105, and 140 g ai/ha”
e1“1% injury was observed at 42 DAT with all imazethapyr application timings”
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