Reação de cultivares de algodoeiro a Ramularia areola

Lima, Lonjoré Leocádio de; Barreto, Modesto; Scaloppi, Érika Auxiliadora Giacheto

doi:10.1590/s0100-54052010000100010

Cited by 6 publications

(5 citation statements)

References 4 publications

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“…Although [30] found similar results to the present study, in which the severity progress curves for the red rot of sisal (Agave sisalana Perrine) caused by fungus Aspergillus Niger did not fit any of the tested mathematical models, [31] found a better fit of monomolecular model for the progress curves of areolate mildew in five cotton cultivars. [32] evaluating the areolate mildew severity in different handling systems, reported less severity of disease in sowing direct system (SDS), whose principles are based in the cover soil and in the crop turn, followed of conventional system with crop turn biannual.…”

Section: Discussionsupporting

confidence: 85%

Epidemiologic Study of Ramularia areola under Different Soil Covers and Spacings, for Cotton Crops

Pizzato¹,

Araújo²,

Serafim³

et al. 2013

AJPS

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The objective of this work was to evaluate the progress of the areolate mildew of cotton under different soil cover and spacing conditions. The experiment was carried out using randomized blocks and a 2 × 3 factorial design, with two spacings (0.45 m and 0.90 m) and three soil covers (no cover, Pennisetum glaucum and Crotalaria spectabilis) with four replications. The plants were inoculated with R. areola, sixty DAS. A total of 14 evaluations of disease severity were performed. At the lower, middle and upper thirds of plants, a diagram scale with nine levels of severity was used and the resulting data were converted into the AUDPC. Gompertz, logistic, and monomolecular mathematical models were tested in the disease severity curves for each third. Agronomics characteristics were evaluated as well. Significant differences of AUDPC were found for the cotton plants thirds, and the middle third was the highest AUDPC. Significant difference for the lower and upper thirds, whose AUDPC were highest on 0.90 m spacing, was observed too. The disease progress curves of the thirds did not fit the tested models. Significant results to the both covers situations, where the treatments grown on crotalária cover and without cover had highest AUDPC, were evidenced. The treatments with C. spectabilis cover were taller than other treatments. Significant data were observed for the cover crops used and in the treatments grown at 0.90 m spacing, to residual cover and crop yield, respectively.

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Section: Discussionsupporting

confidence: 85%

Epidemiologic Study of Ramularia areola under Different Soil Covers and Spacings, for Cotton Crops

Pizzato¹,

Araújo²,

Serafim³

et al. 2013

AJPS

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“…In countries like Madagascar and India, yield losses due to the disease can reach up to 60 % of the crop ( Kirkpatrick & Rothrock 2001 ). In Brazil it was considered a minor disease but the expansion of the cultivated area on cotton and the introduction of susceptible varieties increased the disease incidence and yield losses now reach 30 % of crop production ( Lima et al. 2010 ).…”

Section: Resultsmentioning

confidence: 99%

All that glitters is not Ramularia

Videira

Groenewald

Braun

et al. 2016

Studies in Mycology

113

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Ramularia is a species-rich genus that harbours plant pathogens responsible for yield losses to many important crops, including barley, sugar beet and strawberry. Species of Ramularia are hyphomycetes with hyaline conidiophores and conidia with distinct, thickened, darkened, refractive conidiogenous loci and conidial hila, and Mycosphaerella sexual morphs. Because of its simple morphology and general lack of DNA data in public databases, several allied genera are frequently confused with Ramularia. In order to improve the delimitation of Ramularia from allied genera and the circumscription of species within the genus Ramularia, a polyphasic approach based on multilocus DNA sequences, morphological and cultural data were used in this study. A total of 420 isolates belonging to Ramularia and allied genera were targeted for the amplification and sequencing of six partial genes. Although Ramularia and Ramulariopsis proved to be monophyletic, Cercosporella and Pseudocercosporella were polyphyletic. Phacellium isolates clustered within the Ramularia clade and the genus is thus tentatively reduced to synonymy under Ramularia. Cercosporella and Pseudocercosporella isolates that were not congeneric with the ex-type strains of the type species of those genera were assigned to existing genera or to the newly introduced genera Teratoramularia and Xenoramularia, respectively. Teratoramularia is a genus with ramularia-like morphology belonging to the Teratosphaeriaceae, and Xenoramularia was introduced to accommodate hyphomycetous species closely related to Zymoseptoria. The genera Apseudocercosporella, Epicoleosporium, Filiella, Fusidiella, Neopseudocercosporella, and Mycosphaerelloides were also newly introduced to accommodate species non-congeneric with their purported types. A total of nine new combinations and 24 new species were introduced in this study.

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“…Several authors have described the resistance and susceptibility of cotton to Ramularia leaf spot (Lima et al, 2010;Cia et al, 2008Cia et al, , 2014. In this study, were observed significant interactions between genotype and chemical fungicide and biofungicide treatments.…”

Section: Discussionmentioning

confidence: 55%

Management of Ramularia leaf spot on cotton using integrated control with genotypes, a fungicide and Trichoderma asperellum

2017

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Ramularia leaf spot, caused by Ramularia areola, is responsible for premature defoliation of cotton, resulting in potential reductions in yield. The objective of this study was to evaluate integrated control using genotypes, a fungicide and Trichoderma asperellum to manage Ramularia leaf spot on cotton. In the greenhouse, the resistance of eighteen genotypes was evaluated with two isolates of R. areola (IMA 244 and IMA 237). In field, the severity of Ramularia leaf spot was evaluated on cotton genotypes CNPA MT 2009-1381, CNPA GO 2007-419, BRS 293, BRS 372, CNPA GO 2008-1265 and FMT 701 treated or untreated with a fungicide in Primavera do Leste, MT, Correntina, BA, and Santa Helena de Goi as, GO, during the 2011e2012 season. The varieties BRS 293 and BRS 372 were sprayed with a fungicide or Trichoderma in Sapezal, MT, during the 2012e2013 season, and the disease severity and fiber yield were evaluated. Significant interactions were detected between Ramularia isolates and cotton genotypes; the lowest disease severity was observed with IMA CD 05e8276 and CNPA GO 2007-419 genotypes. In the field tests, the lowest disease severity was with variety BRS 372 and the highest was with BRS 293, when grown in two different regions. The chemical fungicide and T. asperellum both reduced the disease severity in cotton varieties BRS 372 and BRS 293; however, yields were not significantly affected. In conclusion, an integrated strategy with the management tools of resistant varieties, fungicides and biocontrol agents should be used to control Ramularia leaf spot on cotton.

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Reação de cultivares de algodoeiro a Ramularia areola

Cited by 6 publications

References 4 publications

Epidemiologic Study of Ramularia areola under Different Soil Covers and Spacings, for Cotton Crops

Epidemiologic Study of Ramularia areola under Different Soil Covers and Spacings, for Cotton Crops

All that glitters is not Ramularia

Management of Ramularia leaf spot on cotton using integrated control with genotypes, a fungicide and Trichoderma asperellum

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