Abstract
Field studies were conducted in 1999 and 2000 at Simcoe, Ridgetown, and Exeter, Ontario, to evaluate the tolerance of nine sweet corn cultivars to mesotrione, applied preemergence (PRE) at 140 and 280 g ai/ha and postemergence (POST) at 100 and 200 g ai/ha. Urea ammonium nitrate fertilizer (28%) at 2.5% (v/v) and crop oil concentrate at 1% (v/v) were added to POST applications of mesotrione only. All cultivars were tolerant to mesotrione applied PRE. There was no injury, or reductions in plant height or yield with PRE applications of mesotrione at any location in either year. POST applications of mesotrione, particularly at 200 g/ha, caused significant phytotoxicity to ‘Calico Belle’ and ‘Del Monte 2038’. Other cultivars also showed phytotoxic symptoms; however, this injury was much reduced and did not occur at all locations each year. Sweet corn injury by mesotrione increased as rate increased. Del Monte 2038 also had significantly reduced plant height and yields. Other cultivars had no plant height or yield reductions because of POST applications of mesotrione.Nomenclature: Mesotrione; sweet corn, Zea mays L.Additional index words: Crop injury, plant height, triketone.Abbreviations: DAP, days after planting; DAT, days after treatment; HPPD, p-hydroxy-phenylpyruvate dioxygenase; OM, organic matter; PRE, preemergence; POST, postemergence; SU, sulfonylurea.
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Claims 10
Claim · model-written summary
All sweet corn cultivars tolerated preemergence mesotrione.
Not reportedComparatorDirection
Verbatim
e0“All cultivars were tolerant to mesotrione applied PRE.”
t0“Sweet Corn”
Claim · model-written summary
Preemergence mesotrione caused no injury in sweet corn.
Not reportedComparator
Verbatim
e0“There was no injury, or reductions in plant height or yield with PRE applications of mesotrione at any location in either year.”
t0“Sweet Corn”
Claim · model-written summary
Preemergence mesotrione did not reduce sweet corn plant height or yield.
- Taxon
- Sweet Cornt0
- Treatment
- PRE applications of mesotrionee0
- Outcome
- plant height or yielde0
- Direction
- no injury, or reductionse0
Not reportedComparator
Verbatim
e0“There was no injury, or reductions in plant height or yield with PRE applications of mesotrione at any location in either year.”
t0“Sweet Corn”
Claim · model-written summary
Postemergence mesotrione, particularly 200 g/ha, caused significant phytotoxicity in Calico Belle.
- Taxon
- Sweet Cornt0
- Material
- ‘Calico Belle’e0
- Treatment
- POST applications of mesotrione, particularly at 200 g/hae0
- Outcome
- phytotoxicitye0
- Direction
- causede0
Not reportedComparator
Verbatim
e0“POST applications of mesotrione, particularly at 200 g/ha, caused significant phytotoxicity to ‘Calico Belle’ and ‘Del Monte 2038’.”
t0“Sweet Corn”
Claim · model-written summary
Postemergence mesotrione, particularly 200 g/ha, caused significant phytotoxicity in Del Monte 2038.
- Taxon
- Sweet Cornt0
- Material
- ‘Del Monte 2038’e0
- Treatment
- POST applications of mesotrione, particularly at 200 g/hae0
- Outcome
- phytotoxicitye0
- Direction
- causede0
Not reportedComparator
Verbatim
e0“POST applications of mesotrione, particularly at 200 g/ha, caused significant phytotoxicity to ‘Calico Belle’ and ‘Del Monte 2038’.”
t0“Sweet Corn”
Claim · model-written summary
Other cultivars showed phytotoxic symptoms that were much reduced and varied by location and year.
- Taxon
- Sweet Cornt0
- Treatment
- mesotrionee1
- Outcome
- phytotoxic symptomse0
- Direction
- reducede0
- Qualifier
- did not occur at all locations each yeare0
Not reportedComparator
Verbatim
e0“Other cultivars also showed phytotoxic symptoms; however, this injury was much reduced and did not occur at all locations each year.”
t0“Sweet Corn”
e1“Sweet corn injury by mesotrione increased as rate increased.”
Claim · model-written summary
Sweet corn injury increased as the mesotrione rate increased.
Verbatim
e0“Sweet corn injury by mesotrione increased as rate increased.”
Claim · model-written summary
Postemergence mesotrione significantly reduced Del Monte 2038 plant height.
- Taxon
- Sweet Cornt0
- Material
- Del Monte 2038e0
- Treatment
- POST applications of mesotrionee1
- Outcome
- plant heighte0
- Direction
- reducede0
Not reportedComparator
Verbatim
e0“Del Monte 2038 also had significantly reduced plant height and yields.”
t0“Sweet Corn”
e1“POST applications of mesotrione, particularly at 200 g/ha, caused significant phytotoxicity to ‘Calico Belle’ and ‘Del Monte 2038’.”
Claim · model-written summary
Postemergence mesotrione significantly reduced Del Monte 2038 yield.
- Taxon
- Sweet Cornt0
- Material
- Del Monte 2038e0
- Treatment
- POST applications of mesotrionee1
- Outcome
- yieldse0
- Direction
- reducede0
Not reportedComparator
Verbatim
e0“Del Monte 2038 also had significantly reduced plant height and yields.”
t0“Sweet Corn”
e1“POST applications of mesotrione, particularly at 200 g/ha, caused significant phytotoxicity to ‘Calico Belle’ and ‘Del Monte 2038’.”
Claim · model-written summary
Other cultivars showed no plant height or yield reductions after postemergence mesotrione.
- Taxon
- Sweet Cornt0
- Treatment
- POST applications of mesotrionee0
- Outcome
- plant height or yielde0
- Direction
- no plant height or yield reductionse0
Not reportedComparator
Verbatim
e0“Other cultivars had no plant height or yield reductions because of POST applications of mesotrione.”
t0“Sweet Corn”
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