Abstract:RESUMO A cultura da goiaba apresenta perdas em torno de 40 a 60% na pós-colheita relacionadas a problemas fitossanitários, como a antracnose causada pelo fungo Colletotrichum gloeosporioides. Pesquisas com métodos alternativos utilizando indutores de resistência têm sido bastante promissoras na busca de produtos com alto potencial no controle de patógenos em pós-colheita. Assim, o presente trabalho teve como objetivo avaliar os indutores de resistência no controle da antracnose e seus efeitos na qualidade físi… Show more
“…The organic acids (ascorbic, citric, and lactic) and the bioflavonoids give an antioxidant action to Ecolife ; together with the peptides, they act as microbiostatic agents, assisting the balance of the microbial flora (Motoyama et al, 2003). Several authors describe, in their researches, the fungistatic capacity of Ecolife in vitro (Cruz et al, 2011;Gomes et al, 2016). Other authors observed that, for Ecolife , the antimicrobial activity was dose-dependent (Motoyama et al, 2003;Barguil et al, 2005).…”
The use of more than one control technique can maximize the reduction of the damages caused by the fungus Asperisporium caricae causal agent of the black spot in the papaya crop. The objective of this work was to evaluate the sensitivity of the fungi Hansfordia pulvinata and Acremonium spp. to alternative products with potential for use in the control of the black-spotted ptarmigan. Three isolates of Acremonium spp. (A-598, A-602 and A-617) and an isolate of H. pulvinata (H-611) were grown in BDA medium containing Agro-Mos , Bion , Ecolife , Hortifospk , Matriz G , Vitaphol separately. The Amistar 500WG fungicide was used as a positive control and pure BDA as a negative control. The toxicity of the tested products was determined based on the values of the biological index, derived from the means of mycelial growth, sporulation and germination of conidia, in each experimental unit. In this way it was possible to select the products classified as compatible for all isolates, and to test them in vivo. In the greenhouse, only the isolates and isolates with selected products, were applied in papaya plants with foliar symptoms of black-spotted. The incidence of leaves with hyperparasites and the percentage of black-painted lesions colonized by the tested isolates were evaluated. Thus, the H-611 isolate proved to be compatible with most of the alternative products tested, except with Hortifos . Bion and Matrix products were compatible with all tested isolates and could be used in conjunction with Acremonium spp. and H. pulvinata to control the papaya black spot, since these products did not present toxicity on the hyperparasitic fungi.
“…The organic acids (ascorbic, citric, and lactic) and the bioflavonoids give an antioxidant action to Ecolife ; together with the peptides, they act as microbiostatic agents, assisting the balance of the microbial flora (Motoyama et al, 2003). Several authors describe, in their researches, the fungistatic capacity of Ecolife in vitro (Cruz et al, 2011;Gomes et al, 2016). Other authors observed that, for Ecolife , the antimicrobial activity was dose-dependent (Motoyama et al, 2003;Barguil et al, 2005).…”
The use of more than one control technique can maximize the reduction of the damages caused by the fungus Asperisporium caricae causal agent of the black spot in the papaya crop. The objective of this work was to evaluate the sensitivity of the fungi Hansfordia pulvinata and Acremonium spp. to alternative products with potential for use in the control of the black-spotted ptarmigan. Three isolates of Acremonium spp. (A-598, A-602 and A-617) and an isolate of H. pulvinata (H-611) were grown in BDA medium containing Agro-Mos , Bion , Ecolife , Hortifospk , Matriz G , Vitaphol separately. The Amistar 500WG fungicide was used as a positive control and pure BDA as a negative control. The toxicity of the tested products was determined based on the values of the biological index, derived from the means of mycelial growth, sporulation and germination of conidia, in each experimental unit. In this way it was possible to select the products classified as compatible for all isolates, and to test them in vivo. In the greenhouse, only the isolates and isolates with selected products, were applied in papaya plants with foliar symptoms of black-spotted. The incidence of leaves with hyperparasites and the percentage of black-painted lesions colonized by the tested isolates were evaluated. Thus, the H-611 isolate proved to be compatible with most of the alternative products tested, except with Hortifos . Bion and Matrix products were compatible with all tested isolates and could be used in conjunction with Acremonium spp. and H. pulvinata to control the papaya black spot, since these products did not present toxicity on the hyperparasitic fungi.
“…In the present study, application of elicitors did not result in the activation of any mechanism associated with increased betalain production in beetroot. Previous studies on the use of elicitors to control pathogens demonstrated that compounds were able to suppress and/or damage nematodes, as evidenced by the decrease in infection area size, disease severity, or pathogen proliferation (Gomes et al, 2016;Neumann Silva et al, 2017;Antonio et al, 2018). Here such effects resulted in a decrease in RF.…”
Section: Lignification Of Plant Cells Increases Wall Rigidity Conferringmentioning
Beetroot is rich in nutrients and bioactive compounds, such as, betalains and phenolics. The objective of this work was to analyze the chemical composition and antioxidant properties of beetroot parasitized by Meloidogyne javanica and treated with elicitors. Beet seedlings were inoculated with 1000 eggs and second-stage juveniles of M. javanica and treated with elicitors based on mannan oligosaccharides, citrus biomass, or acibenzolar-S-methyl (ASM). At 60 days after inoculation, plants were evaluated for nematode reproduction factor (RF), proximate composition, betalains, phenolic compounds, and antioxidant activity. Beetroot was found to be susceptible to M. javanica, with RF values ranging from 15.26 to 27.94. ASM and citrus biomass treatments increased ash content by 15–25% in nematode-inoculated plants. There was no treatment effect on moisture or protein content, but uninoculated plants had higher total phenolic content (~35%) than inoculated plants. Nematode infection was found to compromise betalain production but did not impact antioxidant activity. Nematode-inoculated plants showed reduced sucrose content and increased glucose and fructose levels in all treatments. Regardless of the elicitor used, beetroots inoculated M. javanica exhibit deformities that render them unmarketable in fresh form. However, the results indicate that nematode-infected beetroot may be suitable for industrial processing and compound extraction.
“…Apesar dos indutores fosfito de potássio e biomassa cítrica apresentarem pouca ação fungitóxica sobre C. cassiicola, verificou-se que o indutor biomassa cítrica obteve CE50 inibitória da germinação de esporos menor que 10 µg mL -1 . O indutor biomassa cítrica, quando aplicado em bananas, mostrou-se eficiente na erradicação dos conídios de Mycosphaerella fijiensis aderidos à casca dos frutos, inibindo totalmente a germinação dos conídios(Hanada et al, 2004) Gomes et al (2016). constataram efeito inibitório de biomassa cítrica no crescimento de Colletotrichum gloeosporioides in vitro.…”
A mancha alvo, causado por Corynespora cassiicola, é a principal doença que ocorre na cultura da acerola, causando intensa desfolha. Este trabalho teve como objetivo avaliar o efeito in vitro de produtos químicos (fungicidas, fertilizantes foliares e indutores de resistência) sobre o crescimento micelial e a germinação de esporos de C. cassiicola, assim como o efeito desses produtos na incidência e na severidade da mancha alvo, em pomar comercial de acerola. Foi constatado in vitro que tebuconazole, carbendazim, epoxiconazol + pyraclostrobin, cloreto dodecil dimetil amônio, óxido de potássio + ácido fosforoso e biomassa cítrica apresentaram maior efeito fungitóxico sobre C. cassiicola. No campo, carbendazim proporcionou menor incidência e severidade da mancha alvo, controlando a doença satisfatoriamente.
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