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 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.
Keywords
alternative products; fungal diseases; plant health
