Abstract
The impact of N rate on development of Cercospora leaf spot on field grown ‘Carolina Beauty’ crapemyrtle and the impact of this disease, as well as N rate, on plant growth was assessed in Alabama. From 2002 to 2005, ammonium nitrate was applied at an N rate of 2, 4.1, 8.3, 16.5, 33.0, and 66.0 g/m 2 . Heritage 50W fungicide was applied to one tree in each plot, while the second tree was not treated. Powdery mildew was very sporadic and was not related to N rate. An N rate-related reduction in Cercospora leaf spot intensity and defoliation was noted on the non-fungicide and fungicide treated trees in 2005 but not in 2003 and 2004. In 2005, reductions in disease intensity and defoliation were obtained at the three highest N rates of 16.5, 33, and 66 g/m 2 compared to the two lowest N rates of 2 and 4.1 g/m 2 . Regardless of N rate, Heritage 50W suppressed Cercospora leaf spot. Despite considerable leaf spotting and premature defoliation, Cercospora leaf spot did not impact crapemyrtle growth. Increasing N rates was less effective than Heritage 50W fungicide in controlling Cercospora leaf spot and also failed to enhance tree growth. Accepted for publication 10 September 2009. Published 14 December 2009.
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Claims 6
Claim · model-written summary
The three highest N rates reduced Cercospora leaf spot intensity and defoliation compared with the two lowest rates in 2005.
- Taxon
- Crapemyrtle
_em_um_fim_de_tarde_em_Bag%C3%A9-RS.jpg?width=60)
Lagerstroemia indicat0 - Treatment
- three highest N rates of 16.5, 33, and 66 g/m 2e3
- Interactor
- Cercospora
Cercosporae2pathogen - Outcome
- disease intensity and defoliatione3
- Direction
- reductionse3
- Qualifier
- in 2005 but not in 2003 and 2004e2
- Comparator
- two lowest N rates of 2 and 4.1 g/m 2e3
- Setting
- Alabamae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_em_um_fim_de_tarde_em_Bag%C3%A9-RS.jpg?width=500)
Verbatim
e3“In 2005, reductions in disease intensity and defoliation were obtained at the three highest N rates of 16.5, 33, and 66 g/m 2 compared to the two lowest N rates of 2 and 4.1 g/m 2”
e2“An N rate-related reduction in Cercospora leaf spot intensity and defoliation was noted on the non-fungicide and fungicide treated trees in 2005 but not in 2003 and 2004”
e0“was assessed in Alabama”
t0“Growth of Crapemyrtle”
Claim · model-written summary
Heritage 50W fungicide suppressed Cercospora leaf spot regardless of N rate.
- Taxon
- CrapemyrtleLagerstroemia indicat0
- Treatment
- Heritage 50We4
- Interactor
- CercosporaCercosporae4pathogen
- Outcome
- Cercospora leaf spote4
- Direction
- suppressede4
- Comparator
- the second tree was not treatede5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Regardless of N rate, Heritage 50W suppressed Cercospora leaf spot”
e5“the second tree was not treated”
t0“Growth of Crapemyrtle”
Claim · model-written summary
Increasing N rates was less effective than the Heritage 50W fungicide in controlling Cercospora leaf spot.
- Taxon
- CrapemyrtleLagerstroemia indicat0
- Treatment
- Increasing N ratese7
- Interactor
- CercosporaCercosporae7pathogen
- Outcome
- controlling Cercospora leaf spote7
- Direction
- less effectivee7
- Comparator
- Heritage 50W fungicidee7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“Increasing N rates was less effective than Heritage 50W fungicide in controlling Cercospora leaf spot and also failed to enhance tree growth”
t0“Growth of Crapemyrtle”
Claim · model-written summary
Increasing N rates failed to enhance crapemyrtle tree growth.
- Taxon
- CrapemyrtleLagerstroemia indicat0
- Treatment
- Increasing N ratese7
- Outcome
- tree growthe7
- Direction
- failed to enhancee7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“Increasing N rates was less effective than Heritage 50W fungicide in controlling Cercospora leaf spot and also failed to enhance tree growth”
t0“Growth of Crapemyrtle”
Claim · model-written summary
Cercospora leaf spot did not impact crapemyrtle growth.
- Taxon
- crapemyrtleLagerstroemia indicae6
- Interactor
- Cercospora leaf spote6pathogen
- Outcome
- crapemyrtle growthe6
- Direction
- did not impacte6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“Despite considerable leaf spotting and premature defoliation, Cercospora leaf spot did not impact crapemyrtle growth”
t0“Growth of Crapemyrtle”
Claim · model-written summary
Powdery mildew was not related to N rate.
- Taxon
- CrapemyrtleLagerstroemia indicat0
- Treatment
- N ratee1
- Interactor
- Powdery mildewe1pathogen
- Outcome
- Powdery mildewe1
- Direction
- not relatede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Powdery mildew was very sporadic and was not related to N rate”
t0“Growth of Crapemyrtle”
The same questions in other papers
nitrogen · growth · Lagerstroemia indica (crepe myrtle)Positive and negative results
1 paper in the same direction as this paper · 3 in the opposite direction
- positive
- positive
- positive
1 paper more in this group
See all 5 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.