Uso de produtos naturais no controle de antracnose causado por Colletotrichum gloeosporioides em mamão

'BRS Isis' is a novel hybrid seedless table grape with large reddish bunches. This cultivar is cultivated in tropical and subtropical areas and has potential to be exported overseas; however, under these growth conditions, grapes can be severely damaged by gray mold (Botrytis cinerea), the main postharvest disease of table grapes. Thus, this study aimed to evaluate different pre-and postharvest strategies to extend the storage period of 'BRS Isis' seedless table grapes. The treatments consisted of grapes packed into carton boxes under cold storage (1 • C and high relative humidity), pre-and/or postharvest treatment with potassium bicarbonate or a biological control agent (Bacillus subtilis), all with Botrytis inoculation. Additionally, two controls, with and without Botrytis inoculation, were also evaluated. The experimental design was completely randomized with eight treatments and three replications, and each plot consisted of four bunches. After a 50-day cold storage period, the carton boxes were kept for five days at room temperature (22 • C). Gray mold incidence and water loss, as well as soluble solids (SS), pH, titratable acidity (TA), SS/TA ratio, and color attributes were evaluated during both periods. Cold storage effectively reduced gray mold in 'BRS Isis' seedless grape for a period of 50 days, even when grapes were inoculated; however, no difference among treatments was observed. Higher water loss was observed in both non-treated control treatments.

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“…More recently, biological products, such as Bacillus subtilis and Trichoderma sp. have been employed as biological control agents [30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Cold Storage and Biocontrol Agents to Extend the Storage Period of ‘BRS Isis’ Seedless Table Grapes

et al. 2018

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“…In addition to the promising results obtained in the present study, other researches also recorded positive effects. Ribeiro et al (2016), for example, used Rocksil ® at a concentration of 30 g L -1 and found lower severity of anthracnose on papaya, in comparison to the other treatments tested. Applying Ecolife ® for the control of anthracnose on papaya, Carnelossi et al (2009) found lesions measuring 1.0 mm in length, as well as a lower AUDPC, in comparison to the other treatments tested.…”

Section: Resultsmentioning

confidence: 98%

“…For example, the potassium phosphite activates defense mechanisms, promoting a series of biochemical and physiological alterations that increase the production of PRs-proteins, signaling compounds (salicylic acid) phytoalexins, as well as the accumulation of reactive oxygen species (Junqueira 2010 Among the effective elicitors, Rocksil ® contains silicon, which is an element that increases the resistance of plants to the attack of pathogens. Recent studies have suggested that, besides the mechanical effect on the penetration of the spores of the pathogen into the host, Si is also involved with the accumulation of antifungal compounds, by activating defense-related enzymes and phytoalexins (Ribeiro et al 2016).…”

Section: Resultsmentioning

confidence: 99%

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Elicitors on the control of anthracnose and post-harvest quality in papaya fruits1

Demartelaere

Nascimento

Guimarães

et al. 2017

Pesqui. Agropecu. Trop.

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Papaya is one of the most grown and consumed fruits in the world. However, post-harvest diseases are responsible for more than 50 % of losses, including anthracnose, caused by Colletotrichum gloesporioides, which promotes necrotic and rounded lesions and reduces fruit quality. Alternative products have been widely investigated in the control of pathogens. This study aimed at evaluating the efficiency of elicitors in the control of anthracnose, as well as their effect on post-harvest quality, in papaya fruits. The fruits were disinfested and immersed in acibenzolar-S-methyl, potassium phosphite, Rocksil®, Agro-mos®, Ecolife®, sterilized distilled water and prochloraz, inoculated with C. gloesporioides and stored. Potassium phosphite, Rocksil®, Ecolife® and prochloraz resulted in the smallest diameters of lesions, and, consequently, in a greater protection and enzymatic activity. The fruits treated with Rocksil® and Ecolife® maintained the lowest levels of soluble solids and titratable acidity. Potassium phosphite, Rocksil® and Ecolife® are effective in controlling anthracnose, do not change the appearance and preserve the post-harvest quality of papaya fruits, and, therefore, may be used as an alternative to commercial fungicides.

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“…Não obstante, o uso excessivo do controle químico tem levado ao surgimento de várias formas de resistência em insetos, fungos fitopatogênicos e plantas invasoras, o que induz o aumento do número de aplicações de diferentes tipos de agroquímicos, elevando os custos de produção e promovendo contaminação do solo, da água, do homem e dos animais (BURIGO, 2016;LOPES ;ALBUQUERQUE, 2018). Diante desta preocupante realidade, verifica-se um interesse crescente por parte da sociedade e dos setores ligados à agricultura, pela adoção de estratégias e tecnologias alternativas para o manejo de pragas, que além de eficientes, sejam tecnicamente viáveis e ambientalmente seguras (RIBEIRO et al, 2016;SOUZA et al, 2018;NICOLODI-CAMERA et al, 2018). Dentre as alternativas que tem conquistado destaque no cenário mundial, o uso de moléculas naturais extraídas de plantas bioativas vem demonstrando resultados promissores (MAIA et al, 2015).…”

Section: Introductionunclassified

CONTROLE DE Sclerotinia sclerotiorum E Fusarium sp. COM ÓLEO ESSENCIAL DE MELALEUCA

Steffen¹,

Maldaner²,

Steffen³

et al. 2019

Enci Bio

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RESUMOMelaleuca alternifolia é uma espécie florestal originária da Austrália, com abundante presença de óleo essencial de interesse econômico devido às reconhecidas propriedades bactericida e antifúngica contra patógenos humanos. O objetivo deste trabalho foi avaliar o efeito de concentrações do óleo essencial de melaleuca sobre o crescimento in vitro de Sclerotinia sclerotiorum e Fusarium sp, fitopatógenos de relevante importância agrícola. Concentrações crescentes de óleo essencial de melaleuca (0; 0,1; 0,25; 0,5%) foram solubilizadas em meio de cultura batata-dextrose-ágar. Os meios foram vertidos em placas de Petri (90 mm de diâmetro), seguido da deposição de um disco de micélio fúngico (9 mm de diâmetro) dos fitopatógenos avaliados. As placas foram incubadas em temperatura de 25±1 °C e fotoperíodo de 12 horas. O crescimento micelial foi avaliado através da determinação do diâmetro médio das colônias com auxílio de paquímetro digital, decorridas 72 e 96 horas de incubação. A partir dos dados de crescimento, determinou-se a porcentagem de inibição do crescimento micelial. O óleo essencial de melaleuca apresentou efeito antifúngico aos fitopatógenos S. slerotiorum e Fusarium sp. As concentrações de 0,5% promoveram 100% de inibição do crescimento de ambos os gêneros fúngicos. Considerando os resultados obtidos neste trabalho, o óleo essencial de melaleuca demonstrou potencial para composição de bioprodutos destinados ao uso agrícola. ABSTRACTMelaleuca alternifolia is a forest species from Australia, with abundant presence of essential oil with economic interest due to the recognized bactericidal and antifungal properties against human pathogens. The objective of this article was to evaluate the effect of melaleuca essential oil concentrations on the in vitro growth of Sclerotinia sclerotiorum and Fusarium sp., phytopathogens of relevant agricultural importance. Increasing concentrations of M. alternifolia essential oil (0.1; 0.25; 0.5%) were solubilized in potato-dextrose-agar culture medium. The culture medium were poured into Petri dishes (90 mm diameter), followed by the deposition of a fungal mycelium disc (9 mm diameter) of the phytopathogens. Petri dishes were incubated at 25±1 °C and photoperiod of 12 hours. Mycelial growth was evaluated by determining the average diameter of the colonies with the aid of a digital caliper after 72 and 96 hours of incubation. The percentage inhibition was determined from the growth data. Melaleuca essential oil showed antifungal effect to S. slerotiorum and Fusarium sp. Concentrations of 0.5% promoted 100% growth inhibition of both fungal genera. Considering the results obtained in this study, the melaleuca essential oil showed potential for the composition of bioproducts for agricultural use.

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Uso de produtos naturais no controle de antracnose causado por Colletotrichum gloeosporioides em mamão

Cited by 21 publications

References 8 publications

Cold Storage and Biocontrol Agents to Extend the Storage Period of ‘BRS Isis’ Seedless Table Grapes

Cold Storage and Biocontrol Agents to Extend the Storage Period of ‘BRS Isis’ Seedless Table Grapes

Elicitors on the control of anthracnose and post-harvest quality in papaya fruits1

CONTROLE DE Sclerotinia sclerotiorum E Fusarium sp. COM ÓLEO ESSENCIAL DE MELALEUCA

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