Extratos de Aroeira, Angico, Umburana e Quebra-faca no controle de Lasiodiplodia theobromae em cachos da videira cv. Itália

Abstract

The aim of this study was to evaluate the effect of plant extracts on L. theobromae by using products as an alternative method. Mycelial growth of L. theobromae was analyzed on Petri dishes containing PDA medium supplemented with extracts of Brazilian peppertree, angico, amburana and "quebra-faca" at the concentrations of 10, 20 and 30%. To evaluate the direct effect of extracts on the development of L. theobromae, bunches of grape cv Itália were inoculated with the pathogen and, after 4 h, sprayed with the different extracts: angico and Peixinho, G.S.; Santos, C.M.G.; Ribeiro, V.G.; Amorim, E.P.R.; Carvalho, V.N.; Bispo, J.S.. Extracts of Brazilian peppertree, angico, amburana and "quebra-faca" on Lasiodiplodia theobromae control in bunches of grape cv. Itália. Summa Phytopathologica, v.43, n.2, p.158-160, 2017. amburana (30%) and "quebra-faca" (10%). Sterile distilled water (ADE) was used as control. Subsequently, to evaluate the potential of extracts as resistance inducers, bunches of grape cv Itália were subjected to the same treatments and inoculated, after 4 hours, with L. theobromae. Results showed that extracts of angico and amburana at the concentration of 30% inhibited in vitro mycelial growth by 61.66 and 60%, respectively; however, the tested extracts were not efficient in inhibiting the disease incidence and severity.

Chemical composition and control of Sclerotium rolfsii Sacc by essential oils

“…In this work, the results obtained by essential oils extracted from plants of the genus Croton also deserve to be highlighted,especially C. zehntneri, which showed excellent fungicidal action on S. rolfsii, similar to those revealed by L. sidoides and L. origanoides -Jatobá (Figures 3 and 4). Although there are no results in the researched literature showing the effect of essential oils extracted from Croton on S. rolfsii, there are reports that demonstrate the action of C. conduplicatus in the control of Lasiodiplodia theobromae (Peixinho et al, 2017) and C. rhamnifolioides acting against fungi of the genus Candida (Vidal et al, 2016). In view of the bioactivity demonstrated by the essential oils studied against the fungus S. rofsii, it proved reasonable to evaluate its efficiency individually.…”