Alternative “in vitro” control of Rhizoctonia solani with plant extracts in Alta Floresta - MT.

Abstract

Rhizoctonia solani is a cosmopolitan, soil-dwelling fungus with a large number of hosts responsible
for various diseases in agricultural and forestry crops. The objective of this study was
to evaluate the potential of aqueous extracts on the development of R. solani, a causal agent
of leaf burning in citrus, obtained from leaves collected in rural properties in Alta Floresta -
MT. The assay was carried out in the Microbiology and UNEMAT laboratory, and the mycelial
growth of the pathogen maintained in BDA treated with Pirolenous extract of Timburi and manipueira
in doses was evaluated. The plates were kept in a germination chamber at 24ºC and
photoperiod of 12 hours. The DIC mounted experiment contained 5 replicates. Total inhibition
of growth was observed by pyroligneous extract at 1 ml dose. The manipueira had better results
with the 0.25 mL dose. It is concluded that the pyrillenous extract of Timburi shows promising
fungitoxic activity in the control of R. solani.