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Substância isolada de Conyza canadensis combinada com a irradiação UVC no controle de bolor verde da laranja.
| Content Provider | Semantic Scholar |
|---|---|
| Author | Souza, C. S. M. Terao, Daniel Konda, E. T. Silva, D. R. Da Queiroz, S. C. Do N. De |
| Copyright Year | 2018 |
| Abstract | O Brasil e o maior produtor de laranjas respondendo por 85% do mercado mundial de suco de laranja. Doencas em pos-colheita reduzem a quantidade e a qualidade de frutos citricos comercializaveis e podem provocar grandes perdas, sendo a principal delas o bolor verde causada pelo fungo Penicillium digitatum. O controle desta doenca e feito pela aplicacao de fungicidas sinteticos nos tratamentos pos-colheita, no entanto, eles representam perigo a saude humana e contaminam o meio ambiente. Existe, portanto, uma demanda por metodos alternativos de controle, dentre eles tem se destacado os biopesticidas a base de compostos naturais de plantas e os tratamentos fisicos usando a irradiacao com luz ultravioleta C (UVC), por serem tecnologias limpas e que nao deixam residuos toxicos. O presente trabalho teve como objetivo estudar a eficiencia da aplicacao de substância isolada de Conyza canadensis combinada a irradiacao UVC no controle de bolor verde em laranja Pera. No primeiro ensaio foram avaliadas tres doses (10; 50 e 100 µg mL-1) da substância (4Z)-lachnophyllum lactona (LACH) extraida de C. canadensis pela aspersao de dois jatos de spray (1mL) da suspensao da substância no local da inoculacao. No segundo ensaio utilizou-se a combinacao da substância LACH, nas mesmas doses do ensaio anterior, com a irradiacao (UVC) na dose de 2,0 kJ m-2. Os ensaios comprovaram a eficiencia da substância (LACH) no controle do bolor verde em laranja pera, sendo que a eficiencia aumentou em funcao do aumento da dose. A combinacao com a irradiacao de luz UVC, apos a aplicacao da substância, apresentou um efeito sinergico, melhorando significativamente o controle da doenca. Brazil is the leader in production of oranges accounting for 85% of the orange juice world market. Postharvest diseases reduce the quantity and quality of marketable citrus fruits and cause great losses, and the main postharvest disease is the green mold caused by Penicillium digitatum. The control of this disease has been made by the application of synthetic fungicides on the postharvest treatments; however, they pose a danger to human health and contaminate the environment. Therefore, there is a demand for alternative control methods, and among them, biopesticides based on natural plant compounds and physical treatments using ultraviolet C irradiation (UVC), since they are clean technologies and do not leave toxic residues. The present work had the objective of studying the efficiency of the application of substance isolated from Conyza canadensis combined with UVC irradiation on the control of green mold in orange Pera. On the first trial three doses (10, 50 and 100 µg mL-1) of the substance (4Z)-lachnophyllum lactone (LACH) extracted from C. Canadensis were evaluated by spraying two spray jets (1mL) of the suspension of the substance at the inoculation site. In the second test were combined of LACH substance at the same doses of the previous test with the UVC irradiation at the dose of 2.0 kJ m-2. The tests proved the efficiency of the substance (LACH) in the control of green mold in orange, and the efficiency increased according to the dose increase. The combination with UVC light irradiation, after application of the substance, showed a synergistic effect, significantly improving the disease control. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www2.aptaregional.sp.gov.br/ciic2017/resumo2017/MEIO_AMBIENTE/17415RE_Caroline_Sonia.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
