Abstract
ABSTRACT Ramularia leaf spot (RLS) is the major cotton disease in Brazil and one of the main causes of crop yield reduction. The disease causes defoliation reduces photosynthetic capacity and causes premature opening of bolls. Due to the impact of RLS on the production of Brazilian cotton and the lack of scientific publications investigating the disease, the present work aims to evaluate the efficiency of fungicides in controlling disease and their impact on yield and fiber quality. Three field experiments were carried out during the 2014/2015 and 2016/2017 seasons in Planaltina, Federal District and Cristalina, Goiás. Experiments followed a randomized complete block design (4 blocks) and treatments consisted of the application of fungicides, plus a non-treated plot. The fungicide applications began preventively and were repeated every 14 days until six sprays had been completed. Severity of RLS was assessed and used to calculate the area under disease progress curve (AUDPC). Yield and cotton fiber quality were also evaluated. All fungicides had reduced AUDPC and obtained higher cotton yields in relation to the non-treated plot. Strobilurin-group fungicides (azoxystrobin, pyraclostrobin and picoxystrobin) showed low effectiveness when sprayed alone. The demethylation inhibitor fungicides (difenoconazole, epoxiconazol, tetraconazol and metconazole) were more effective than the strobilurins. The highest efficiency rates were achieved by application of pyraclostrobin + fluxapyroxad, pyraclostrobin + epoxiconazole + fluxapyroxad and fentin hydroxide. Disease severity affected cotton yield, causing losses from 14.8% to 31.7%. Resultant reductions in cotton fiber quality negatively affect the micronaire composition, altering the length, strength and uniformity of fibers.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 9
Claim · model-written summary
Fungicides reduced the area under the disease progress curve for cotton Ramularia leaf spot.
- Taxon
- cotton
Gossypium hirsutumt0 - Treatment
- fungicidese0
- Outcome
- AUDPCe0
- Direction
- reducede0
- Comparator
- non-treated plote0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All fungicides had reduced AUDPC and obtained higher cotton yields in relation to the non-treated plot”
t0“cotton”
Claim · model-written summary
Fungicides raised cotton yield relative to the non-treated plot.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- fungicidese0
- Outcome
- cotton yieldse0
- Direction
- highere0
- Comparator
- non-treated plote0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All fungicides had reduced AUDPC and obtained higher cotton yields in relation to the non-treated plot”
Claim · model-written summary
Strobilurin-group fungicides were of low effectiveness when sprayed alone.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- Strobilurin-group fungicidese0
- Outcome
- low effectivenesse0
- Direction
- lowe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Strobilurin-group fungicides (azoxystrobin, pyraclostrobin and picoxystrobin) showed low effectiveness when sprayed alone”
t0“cotton”
Claim · model-written summary
Demethylation inhibitor fungicides were more effective than strobilurins.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- demethylation inhibitor fungicidese0
- Outcome
- more effectivee0
- Direction
- more effectivee0
- Comparator
- strobilurinse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The demethylation inhibitor fungicides (difenoconazole, epoxiconazol, tetraconazol and metconazole) were more effective than the strobilurins”
t0“cotton”
Claim · model-written summary
Pyraclostrobin plus fluxapyroxad attained one of the highest efficiency rates.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- pyraclostrobin + fluxapyroxade0
- Outcome
- highest efficiency ratese0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest efficiency rates were achieved by application of pyraclostrobin + fluxapyroxad, pyraclostrobin + epoxiconazole + fluxapyroxad and fentin hydroxide”
t0“cotton”
Claim · model-written summary
Pyraclostrobin plus epoxiconazole plus fluxapyroxad attained one of the highest efficiency rates.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- pyraclostrobin + epoxiconazole + fluxapyroxade0
- Outcome
- highest efficiency ratese0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest efficiency rates were achieved by application of pyraclostrobin + fluxapyroxad, pyraclostrobin + epoxiconazole + fluxapyroxad and fentin hydroxide”
t0“cotton”
Claim · model-written summary
Fentin hydroxide attained one of the highest efficiency rates.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- fentin hydroxidee0
- Outcome
- highest efficiency ratese0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest efficiency rates were achieved by application of pyraclostrobin + fluxapyroxad, pyraclostrobin + epoxiconazole + fluxapyroxad and fentin hydroxide”
t0“cotton”
Claim · model-written summary
Disease severity caused cotton yield losses of 14.8% to 31.7%.
- Taxon
- cottonGossypium hirsutume0
- Outcome
- cotton yielde0
- Direction
- lossese0
- Value
- 14.8% to 31.7%e0
RamulariaOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Disease severity affected cotton yield, causing losses from 14.8% to 31.7%”
t0“Ramularia leaf spot effect on yield and fiber quality of cotton”
Claim · model-written summary
Disease-related fiber quality reductions altered cotton micronaire, length, strength, and uniformity.
- Taxon
- cottonGossypium hirsutume0
- Outcome
- micronaire composition, altering the length, strength and uniformity of fiberse0
- Direction
- reductionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Resultant reductions in cotton fiber quality negatively affect the micronaire composition, altering the length, strength and uniformity of fibers”
t0“Ramularia leaf spot effect on yield and fiber quality of cotton”
The same questions in other papers
fungicide · yield · Gossypium hirsutum (cotton)Positive and negative results
6 papers in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
- positive
4 papers more in this group
See all 8 papers →fungicide · disease · Gossypium hirsutum (cotton)Positive and negative results
8 papers in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
- positive
6 papers more in this group
See all 10 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.