Antifungal potential of cashew nut shell liquid in the control of plant pathogens

Abstract

ABSTRACT:Extracted from the fruit of Anacardium occidentale L., Cashew Nut Shell Liquid (CNSL) is a phenolic lipid that has potential biological use. Conventional pesticides are increasingly being replaced by natural products because of the impact that their mismanagement can have on human health and the environment. The objective of this work was to evaluate the fungicidal potential effect of CNSL on the fungi Colletotrichum gloesporioides and Lasiodiplodia theobromae, in particular its use in reducing negative impacts on fruit production. Chemical and physical tests were conducted to determine features of the sample, such as pH, electrical conductivity and solubility, and to measure its anacardic acid content. In vitro and in vivo tests were also conducted to evaluate the inhibition of mycelial growth on papaya fruit, the identification of volatile components and the inhibition of spore production. CNSL had the highest fungicidal potential for both fungi in vitro at a concentration of 320 µg mL -1 , and the same concentration was also maximal for sporulation inhibition in both fungi. In the in vivo tests the protective effect of CNSL was higher for C. gloesporioides fungus, whereas its curative effect was higher for L. theobromae. It was found that the substance with fungicidal potential was non-volatile and that the presence of the pathogens altered the chemical properties of the fruit.

Combined effect of corn in the barrier crop and plant extracts against Cowpea mild mottle virus infecting soybean [Glycine max (L.) Merr.] in the field

“…This concept distinguishes typical symptoms. This is in agreement with Garcia et al (2018), who concluded that CNSL had the highest antifungal potential in the control of C. gloeosporioides and L. theobromae in papaya fruits C. gloeosporioides and L. theobromae caused anthracnose and fruit rot, respectively. The bioactive compound of CNSL can prevent the inhibition of mycelial growth and spore production.…”

In vitro antifungal activity of Myrcia ovata essential oils and their major compounds against pathogens of citrus, sweet potato, and coconut

“…The use of natural products, which are less harmful to the environment and humans, instead of synthetic chemical components has been the subject of scientific papers (GARCIA et al, 2018). This research is justified by the economic importance of orange, coconut, and sweet potato crops; the damage caused by the above-mentioned diseases; the lack of studies on the properties of essential oils or major compounds against P. destruens; and the sensitivity of C. acutatum and T. paradoxa to the compounds present in M. ovata essential oils.…”

Líquido de castanha de caju: controle de patogênicos na cultura de soja

“…O Brazilian Journal of Development, Curitiba, v.8, n.12, p. 79245-79261, dec., 2022 líquido é rico em lipídeos fenólicos, em que o componente principal é ácido anacárdico (KUBO et al, 2006). Contudo, extrações em condições de temperaturas iguais e superiores a 100 ºC favorecem a descarboxilação do ácido anacárdico e o aumento dos teores de cardol e formação de cardanol (MATOS;VIEIRA, 2008;MAIA et al, 2015;GARCIA et al, 2018).…”

“…Esse óleo também apresentou potencial fungicida nos ensaios de inibição do crescimento micelial in vitro na concentração de 320 µg mL -1 para Colletotrichum gloesporioides e Lasiodiplodia theobromae. Já em estudos in vivo em frutos de mamões, a maior inibição do óleo ocorreu para o fungo C. gloesporioides no tratamento protetor e para o fungo L. theobromae no tratamento curativo foi mais eficaz (GARCIA et al, 2018).…”