Sensibility "in vitro" to iprodione, growth rate and pathogenicity to Rosa sp. of Botrytis cinerea strains.
Domingues R. J., Töfoli J. G., Pinto R. F.
Author Affiliation: Centro de P. & D. de Sanidade Vegetal, Instituto Biológico, Av. Cons. Rodrigues Alves, 1252, CEP 04014-002, Săo Paulo-SP, Brazil.
Ecossistema 29 : 49-54
Abstract : Six B. cinerea strains from rose, strawberry, lisianthus and mango were evaluated regarding the sensibility in vitro to the fungicide iprodione, growth and pathogenicity rate to Rosa sp.. The sensibility for iprodione was evaluated determining the inhibition percentages of the micelial growth and of conidial germination in the concentrations of 0, 1, 10 and 100 µg.mL-1 of a.i.. The first through the method of the fungicide incorporation to the PDA growth medium and the second using the method of the cellophane paper described by NELLY (1978). The daily rates of growth were obtained through transfer of the strain for Petri's plates contend PDA growth medium, with daily mensurations of your growth. Pathogenicity to Rosa sp. was certain through the petals inoculation highlighted with a conidial suspension drop and posterior evaluation of the severity of the disease. The strains presented sensibility differentiated for the different evaluated criteria. Iprodione provided elevated inhibition levels of the growth micelial for all the isolated and tried concentrations, regarding conidium germination only two strains presented complete inhibition starting from 10 µg.mL-1, while other presented total germination in all studied concentrations. In general, isolated them less sensitive regarding conidial germination presented rates inferior of growth and severity. The strains from strawberry, lisianthus and mango were pathogenic to Rosa sp.