The effects of some environmental factors on the growth and pathogenicity of six pineapple fruit rot pathogens [abacaxi, Ananas comosus, podridao, fungo, Ceratocystis paradoxa, Rhisopus stolonifer, Rhisopus oryzae, Curvularia verruculosa, Aspergillus flavus, Penicillium claviforme]