Geostatistics as a Methodology for Studying the Spatiotemporal Dynamics of &amp;lt;i&amp;gt;Ramularia areola&amp;lt;/i&amp;gt; in Cotton Crops

Pizzato, Jaqueline Aguilla; Araújo, Dejânia Vieira de; Galvanin, Edinéia Aparecida dos Santos; Júnior, Jair Romano; Matos, Ândrea N. A.; Vecchi, Michelle; Zavislak, Francieli Dominiki

doi:10.4236/ajps.2014.515262

Cited by 5 publications

(4 citation statements)

References 12 publications

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“…The results also differ from those found by Schaedler et al (2013) in the middle third of cotton plants grown in a greenhouse, and the fungicide treatment maintained the severity of the disease below 20% of infected leaf area in the lower third. However, the results were similar to those found by Aquino et al (2008b) and Pizzato et al (2014), who reported a marked increase in inoculum source due to microclimatic conditions in the lower third of the plants favored the fungi growth, and because of the moisture accumulated by the canopy closure. They concluded that the increase of inoculum in the area raised the severity levels of the disease, which consequently caused increased infection of the middle and upper thirds successively.…”

Section: Resultssupporting

confidence: 79%

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Severity of Ramularia Leaf Spot and Seed Cotton Yield in Different Sowing Times

et al. 2016

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-The ramularia leaf spot (RLS) disease causes cotton yield losses. Choosing a less susceptible cultivar and a sowing time that are less favorable to the pathogen contribute to the management of this disease. The objective of this work was to evaluate the severity of ramularia leaf spot on cotton cultivars sowed in two different times. The experiment was conducted in a triple factorial design (4x3x2), consisted of four cultivars, the three thirds of the plant and two sowing times, with four replications. Each plot was divided in two twin plots, one with fungicide application (with disease control) and the other without fungicide application (without disease control). The severity assessments were performed every seven days, considering each third of the plant with a diagrammatic scale. Yield was evaluated in each plot. There was a significant interaction between sowing times and the thirds of the plant in the plots without disease control for RLS severity, with the highest values of area under the disease progress curve (AUDPC) in the first sowing time (ST1) and in the lower third of the plant. The FMT705 cultivar had the highest and FM951LL the lowest value of AUDPC. The AUDPC of these cultivars were no statistically different in the second sowing time (ST2), but they had higher AUDPC values in the lower third. Highest yields were found with ST1 in plots with disease control, with no differences between the cultivars, however, lower yields were found in plots without disease control.Keywords: Gossypium hirsutum L. Ramularia areola. Thirds of the plant. RELAÇÃO ENTRE SEVERIDADE DA MANCHA DE RAMULÁRIA E PRODUTIVIDADE DE ALGODOEIRO EM DUAS ÉPOCAS DE SEMEADURARESUMO -A mancha de ramulária promove perdas de produtividade do algodoeiro, em que a escolha da cultivar menos suscetível e a época de semeadura menos favorável ao patógeno contribuem para o manejo da doença. O objetivo deste estudo foi avaliar a severidade da mancha de ramulária em cultivares de algodão conduzido em duas épocas de semeadura. O experimento foi conduzido em esquema fatorial triplo (4x3x2), sendo quatro cultivares, três terços da planta e duas épocas de semeadura, com quatro repetições. Cada parcela foi dividida em duas parcelas gêmeas, onde uma parcela recebeu aplicação de fungicidas (com controle) e a outra parcela não recebeu aplicação de fungicidas (sem controle). As avaliações de severidade foram feitas a cada sete dias, considerando cada terço da planta com auxílio de uma escala diagramática. A produtividade foi avaliada na área útil de cada parcela gêmea. Houve interação significativa entre as épocas de semeadura e terços da planta nas parcelas sem controle, onde os maiores valores da área abaixo da curva de progresso da severidade (AACPS) da mancha de ramulária foram observados na primeira época de semeadura (ES1) e no terço inferior da planta. As cultivares FMT 705 e FM 951 LL apresentaram menor e maior valor de AACPS, respectivamente. Na segunda época de semeadura (ES2), as cultivares não diferiram estatisticamente para AACPS,...

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Section: Resultssupporting

confidence: 79%

“…Pizzato et al (2014) also adapted the assessment method, but attributing a disease severity score of zero for the lower third of the plant due to the high rate of leaf abscission. Differences between assessment methods must be considered for comparing results, since they increase or lower AUDPC values.…”

Section: Resultsmentioning

confidence: 99%

Severity of Ramularia Leaf Spot and Seed Cotton Yield in Different Sowing Times

et al. 2016

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“…Esta suposição corrobora com autores que estudaram o patossistema Phakopsora packyrhizi x soja (MADALOSSO et al 2010, LIMA et al 2012 e Ramularia areola x algodoeiro (THEODORO et al 2012, PIZZATO et al 2013, PIZZATO et al 2014, ASCARI et al 2016. Houve redução significativa da severidade na metade inferior da planta por meio de aplicações iniciando no estádio B1 e seguida por outras com intervalos de 15 dias e quando as aplicações começaram no estádio F1 e com as demais em intervalos de 15 e 25 dias (Tabela 9).…”

Section: Area Under the Ramularia Leaf Spot Progress Curve In The Lowunclassified

Integração de cultivares resistentes e fungicidas no controle da mancha de ramularia (Ramularia areola) e produtividade do algodoeiro

Dias

Theodoro

2017

Rev. Ciên. Agrovet.

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RESUMOO algodoeiro é uma das principais espécies cultivadas na região Centro-Oeste do Brasil e há grande utilização de fungicidas para o controle da mancha de ramulária (MR), uma doença de relevante importância econômica causada por Ramularia areola. O objetivo deste trabalho foi avaliar o efeito da integração de cultivares considerados resistentes (C) e tratamentos fungicidas (TF) no controle da MR e produtividade de algodoeiro cultivado em Chapadão do Sul, MS. Foi utilizado o delineamento de blocos ao acaso, com quatro repetições e arranjo fatorial de 3 (C) x 7 (TF). As avaliações consistiram na estimativa da área abaixo do progresso da doença total (AACPDT), na parte inferior (AACPDI) e superior (AACPDS) das plantas. Da mesma forma, estratificou-se a produtividade de algodão em caroço e o índice de micronaire nas fibras. Os dados foram submetidos ao teste F e as médias comparadas por meio do teste de Scott-Knott a 5 % de probabilidade. Houve interação significativa entre C e TF para AACPDT, AACPDI e AACPDS, menos para produtividade e índice micronaire. Constatou-se que houve: maior produtividade e severidade da mancha de ramulária na região inferior das plantas; não houve diferença de produtividade entre as cultivares; houve efeito de C e TF no índice de micronaire; e os TF não influenciaram significativamente a severidade nas cultivares FMT 705 e FMT 709, resistentes à MR. Estes resultados recomendam a integração de TF e C para o controle da MR do algodoeiro. PALAVRAS-CHAVE:controle genético, controle químico, Gossypium hirsutum, Ramularia areola, sustentabilidade. ABSTRACTCotton is one of the main species grown in the Midwest region of Brazil and there is a high use of fungicides to control Ramularia leaf spot (RLS), an important disease caused by Ramularia areola. The objective of this study was to evaluate the integration of resistant cultivars (C) and fungicides treatments (FT) in the RLS control and yield of cotton grown in Chapadão do Sul, MS, Brazil. The experimental design consisted of randomized blocks with four replications and factorial arrangement of C (3) x FT (7). The whole plant area under the disease curve progress (AUDCP-WP) and from the lower (AUDCP-B) and upper (AUDCP-U) half of the plant were all evaluated. Likewise, cotton yield and micronaire index of the fibers were stratified. Obtained data was submitted to the F test and mean values were compared by the Scott-Knott test at 5% probability. There was a significant interaction between C and FT for AUDCP-WP, AUDCP-B and AUDCP-U but not for yield and micronaire index. Higher productivity and severity of RLS in the lower half was observed; there was no difference in productivity between cultivars; effect of C and FT in the micronaire index; and FT had no significant effect on disease severity in the resistant cultivars FMT 705 and FMT 709. These results recommend the integration of FT and C to control RLS of cotton.

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“…Variations in this disease severity in different crop seasons occur due to climatic differences, initial pathogen inoculum, degree of susceptibility of cultivars and spatial variation of the disease within the experimental plot (Cia et al 2011, Fuzatto et al 2013, Girotto et al 2013, Pizzato et al 2014.…”

Section: Thirds Of the Plantmentioning

confidence: 99%

Ramularia leaf spot severity and effects on cotton leaf area and yield1

Ascari

Mendes

Silva

et al. 2016

Pesqui. Agropecu. Trop.

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Cotton monoculture favors the development of diseases such as ramularia leaf spot, which causes early defoliation and boll rotting, thus decreasing yield. This study aimed at evaluating the severity of ramularia leaf spot and its effects on cotton leaf area and yield. The experiment was conducted in a triple (4 x 3 x 2) factorial design, consisting of four cultivars (FM940GLT, FM944GL, TMG42WS and TMG43WS), three thirds of the plant (lower, middle and upper) and two management conditions (with and without fungicide application). To the variable area under the disease progress curve, the lowest values were observed in the upper third of the TMG42WS and TMG43WS cultivars, with the lower and middle thirds presenting the highest severity. The condition managed with fungicide and the upper third showed the lowest values for area under the disease progress curve. The leaf area was negatively affected by the ramularia leaf spot. Concerning the seed and fiber yields, the highest averages were observed for the middle third and the condition managed with fungicide. There was no statistical difference for cotton yield loss.

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Geostatistics as a Methodology for Studying the Spatiotemporal Dynamics of <i>Ramularia areola</i> in Cotton Crops

Cited by 5 publications

References 12 publications

Severity of Ramularia Leaf Spot and Seed Cotton Yield in Different Sowing Times

Severity of Ramularia Leaf Spot and Seed Cotton Yield in Different Sowing Times

Integração de cultivares resistentes e fungicidas no controle da mancha de ramularia (Ramularia areola) e produtividade do algodoeiro

Ramularia leaf spot severity and effects on cotton leaf area and yield1

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