Caracterização morfogenética e reação de resistência de genótipos de tangerineira a Alternaria alternata f. sp. citri

Porcino, Mirelly Migue; Nascimento, Luciana Cordeiro do; Souza, Josiane de; Souza, Brígida; Nunes, Marciano Costa

doi:10.1590/0100-5405/171161

Cited by 5 publications

(5 citation statements)

References 9 publications

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“…Constatou-se por meio dos mapas de krigagem que a maior severidade da MMA foi observada nas partes mais baixas do terreno (Figura 4). Este fator pode ter contribuído com a maior suscetibilidade da cultura, favorecendo o progresso da doença (Porcino, Nascimento, Souza, Souza, Nunes, 2017).…”

Section: Mapas De Krigagemunclassified

“…Dentre eles, destacam-se as doenças, como a mancha marrom de alternária (MMA), cujo agente etiológico é o fungo Alternaria alternata. A MMA se tornou um fator limitante na produção de tangerineiras, com reflexos no abandono e deslocamento da citricultura vivenciado pelos produtores na busca de novos segmentos produtivos (Porcino, Nascimento, Souza, Souza, Nunes, 2017). Em tangerinas, a doença ocorre em tecidos jovens de folhas, ramos e frutos, podendo reduzir a produção e a qualidade dos frutos (Azevedo et al, 2010).…”

Section: Introductionunclassified

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Distribuição espacial da mancha marrom de alternária em tangerina correlacionada com a fertilidade do solo

Silva,

Freitas,

Oliveira

et al. 2023

Agrarian

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A mancha marrom de alternária (MMA), causada pelo fungo Alternaria alternata, é uma doença limitante no cultivo da tangerina (Citrus reticulata). Assim, objetivou-se com esse trabalho, avaliar a distribuição espacial da MMA e verificar sua relação com a fertilidade do solo, por meio da geoestatística. A área experimental compreendeu de 4,23 ha, onde foram georreferenciados 43 pontos amostrais, espaçados em malha regular de 30 x 30 m. Em cada ponto georreferenciado, avaliou-se a severidade da MMA e a fertilidade do solo. Por meio dos mapas de krigagem, constatou-se maior a área abaixo da curva de progresso da doença (AACPD) nas áreas com maiores teores de potássio e manganês. Também, observou-se que nas áreas com menores valores de pH, relação Ca/K e porcentagem de Ca na CTC, houve maiores valores de AACPD. Portanto, o desequilíbrio de nutrientes no solo, aumenta a severidade da mancha marrom de alternária em tangerina.

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Section: Mapas De Krigagemunclassified

Section: Introductionunclassified

Distribuição espacial da mancha marrom de alternária em tangerina correlacionada com a fertilidade do solo

Silva,

Freitas,

Oliveira

et al. 2023

Agrarian

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“…4,5 Tangerines are the third most important citrus crop group in Brazilian orchards with various species and hybrids, primarily produced for the fresh fruit market. 6 The country ranks sixth in the world in tangerine production, behind China, Spain, Turkey, Morocco and Egypt. 7,8 In 2021, Brazil produced 1.08 million tons of tangerines distributed over 55 000 ha, with the Southeast and South regions represented 59.3% and 33.7% of the total production volume, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…Tangerines are the third most important citrus crop group in Brazilian orchards with various species and hybrids, primarily produced for the fresh fruit market 6 . The country ranks sixth in the world in tangerine production, behind China, Spain, Turkey, Morocco and Egypt 7,8 .…”

Section: Introductionmentioning

confidence: 99%

Climate zoning: identifying suitable regions for the occurrence of Alternaria Brown spot in tangerine trees in Brazil

Aparecido,

Torsoni,

Lima

et al. 2023

Pest Management Science

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BACKGROUNDBrazilian citrus farming has been migrating to nontraditional citrus‐growing regions, which can be considered a challenge for citrus growers, as not all these areas are suitable for tangerine cultivation. Thus, the mapping of regions exhibiting favorable climatic conditions for Alternaria brown spot has become crucial in the selection of appropriate locations for the establishment of new orchards. This mapping enables the implementation of an avoidance strategy, which entails steering clear of areas where the disease is prevalent, aligning with fundamental principles of disease control.RESULTSThus, this study seeks to zone areas with high and low climatic favorability for the occurrence of Alternaria brown spot in tangerine trees in Brazil. Historical climate data series from the NASA‐POWER database were used for all municipalities in Brazil. Agrometeorological variables used to determine the development of Alternaria brown spot were average monthly air temperature (Tmean) and duration of leaf wetness period (LWD). Areas were considered unsuitable climatically when Tmean was <17 °C or >33 °C, relatively suitable when Tmean was between 13 °C and 33 °C and LWD <10%, and climatically suitable when Tmean was between 13 °C and 33 °C and LWD >10%. The states of Paraná, Santa Catarina and Rio Grande do Sul showed greater thermal amplitude within months and throughout the year. The southern region of the country has harsher winters, with minimum temperatures below 15 °C, which is unfavorable for the disease incidence.CONCLUSIONThe states with the greatest favorability for Alternaria brown spot were Paraná, Santa Catarina, and Rio Grande do Sul, mainly from May to September. Rio Grande do Sul was the state in this region that showed the greatest favorability, as a consequence of leaf wetness exceeding 10 h. The main tangerine‐producing regions in Brazil, including the southern part of Minas Gerais, the state of São Paulo and the metropolitan region of Porto Alegre, were mostly classified as relatively favorable areas for the occurrence of Alternaria brown spot. It is recommended that when establishing new tangerine orchards, regions with lower favorability for the occurrence of Alternaria brown spot, such as the North and Central‐West regions of Brazil, particularly the states of Amazonas, Pará and Mato Grosso, should be selected. © 2023 Society of Chemical Industry.

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“…The causal agent of ABS is the fungus Alternaria alternata f. sp. citri, which, when colonizing plant tissue, releases a specific toxin for the tangerine pathotype, causing cell death at the site of the attack, which can occur in all plant organs (PORCINO et al, 2017). The control of ABS is carried out mainly through registered fungicides; however, this practice has been a matter of concern due to the various risks offered to humans and the environment (XU et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Essential oils in the management of Alternaria alternata f. sp. citri in ‘Dancy’ tangerine fruits

et al. 2023

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Tangerines and their hybrids are affected by economically essential diseases. The Alternaria brown spot (Alternaria alternata f. sp. citri) deserves to be highlighted, as it is present in all tangerine production areas. This study aimed to determine the effect of essential oils on A. alternata f. sp. citri. The experiments were carried out in the Laboratories of Phytopathology and Biology and Technology of Post-Harvest of the Federal University of Paraíba, Areia, PB. Three pathogen isolates were used, and ten essential oils from grape, sunflower, eucalyptus, ginger, copaiba, mint, fennel, citronella, clove, and linseed at a concentration of 1%, diluted in potato dextrose agar for in vitro tests. The oils were diluted in distilled water for the fruit test, and the fruits were immersed in the treatments for 5 min. In addition, the fungicide Thiabendazole (400 mL/100L) and sterile distilled water were used as the control treatments. The fruits were inoculated with a conidia suspension of the pathogen (105 conidia/mL). Mycelial Growth Rate Index, colony diameter, spore production and dimensions, fruit disease severity, and enzymatic activity were evaluated. A completely randomized design was used, with 12 treatments and four replications in vivo. The results indicate that the essential oils of mint, eucalyptus, fennel, and citronella were efficient in the in vitro control of the pathogen, ultimately inhibiting the growth of fungal colonies. Eucalyptus oil efficiently managed A. alternata f. sp. citri on ‘Dancy’ tangerine fruits. Essential oils did not influence the enzymatic activity of the fruits.

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Caracterização morfogenética e reação de resistência de genótipos de tangerineira a Alternaria alternata f. sp. citri

Cited by 5 publications

References 9 publications

Distribuição espacial da mancha marrom de alternária em tangerina correlacionada com a fertilidade do solo

Distribuição espacial da mancha marrom de alternária em tangerina correlacionada com a fertilidade do solo

Climate zoning: identifying suitable regions for the occurrence of Alternaria Brown spot in tangerine trees in Brazil

Essential oils in the management of Alternaria alternata f. sp. citri in ‘Dancy’ tangerine fruits

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