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Multiplicidade das ciências agrárias最新文献

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FORMULAÇÃO FUNGICIDA NATURAL À BASE DE EXTRATO DE Azadirachta indica PARA USO COMO DEFENSIVO AGRÍCOLA 以印楝提取物为基础的天然杀菌剂配方,用于农业防御
Pub Date : 1900-01-01 DOI: 10.31692/2526-7701.ivcointerpdvagro.2019.0062
A. Romão, K. Abreu, Elini Alves Oliveira de Sousa, A. P. Filho, C. R. Alves
Research on the application of plant secondary metabolites in integrated pest management is increasing, as the use of these substances can reduce crop production costs, as well as reduce environmental risks and dependence on synthetic insecticides. However, the most widely used methods for insect pest control are still based on the use of synthetic insecticides, which present high risks of toxicity and environmental contamination, as well as high cost. An important phytopathogen for agriculture is the fungus L. theobromae, which is a very aggressive microorganism capable of infecting various plant species and their different organs. The objective of the present work was to develop fungicidal formulations capable of inhibiting the growth of the fungus L. theobromae. Neem extract (Azadiracta indica) formulation was developed with the addition of eucalyptus (Eucalyptus staigeriana), clove (Szigium aromaticum [L]) and citronella (Cymbopogon nardus) essential oil. In vitro evaluation of antifungal activity was used to determine the percentage of mycelial growth (PIC), carried out according to the methodology described by Menten, 1976. The acute toxicity of the formulations was also assessed by determining the LD50 (Lethal Dose 50%) From this study it was possible to infer that the formulations obtained from the ethanolic extract in association with clove and eucalyptus oils have strong fungicidal activities. %, indicating that the essential oils act synergistically with the extract to combat the fungus L. theobromae. Therefore, it was possible to verify that, as well as pure essential oils and crude extract, the formulations have low toxicity.
植物次生代谢物在病虫害综合治理中的应用研究越来越多,因为这些物质的使用可以降低作物生产成本,减少环境风险和对合成杀虫剂的依赖。然而,最广泛使用的害虫防治方法仍然是基于使用合成杀虫剂,这具有很高的毒性和环境污染风险,而且成本也很高。一种重要的农业植物病原体是真菌L.可可菌,它是一种非常具有侵略性的微生物,能够感染各种植物及其不同器官。本工作的目的是开发能够抑制真菌生长的杀菌剂。以桉树(eucalyptus staigeriana)、丁香(Szigium aromaticum [L])和香茅(Cymbopogon nardus)精油为原料,开发了印楝提取物(Azadiracta indica)配方。体外抗真菌活性评估用于确定菌丝生长百分比(PIC),根据Menten(1976)描述的方法进行。通过测定LD50(致死剂量50%)对制剂的急性毒性进行了评估。从这项研究中可以推断,从丁香和桉树油中提取的乙醇提取物中获得的制剂具有很强的杀真菌活性。%,表明精油与提取物协同作用,以对抗真菌。因此,有可能验证,以及纯精油和粗提取物,配方具有低毒性。
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Multiplicidade das ciências agrárias
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