Fungos associados às sementes de ipê-amarelo (Tabebuia serratifolia ) e ipê-roxo (Tabebuia impetiginosa): incidência, efeito na germina？？o e transmiss？o para as plantulas

the aim of this research was to check out what kind of fungi was present in eight samples of ipê-amarelo seeds (tabebuia serratifola) and ipê-roxo (t. impetiginosa) collected from the region of piracicaba, mogi-gua？u and south of minas gerais (lavras, ijaci e itumirim) and to determine the possible damages in the seedlings production of those species. the method used for the health test was the blotter test and, for the germination, gerbox had been used with paper substratum at temperature of 30oc under constant light regime. the seeds, as much in the health test as in the germination, tests were sub sampled in one part that was submitted to superficial desinfestation with sodium hypochlorite of, and one part that wasn't. the fungi transmission had been evaluated through lesions found in the seedlings, during the germination test. sixteen fungi had been identified and quantified: cladosporium sp., alternaria alternata, epicoccum sp., phoma sp., geotrichum sp., penicillium sp., trichothecium sp., phomopsis sp., drechslera sp., aspergillus spp., curvularia sp., fusarium spp., macrophomina phaseolina, nigrospora sp., lasiodiplodia theobroma and septoria sp. in general , the asepsis provided a drastic reduction in the incidence of all fungi, in both species, with an avarege rate of 90%. like this, it can be inferred that most of the fungi was contaminating the seeds. the percentage of normal seedlings had not been interfered directly by the fungi. the asepsis reduced the germination in 64%, indicatinwas fitotoxic. in the transmission it had been observed, on average, 17% and 10% of seedlings with symptoms, in the samples without asepsis and with asepsis, respectively. the most frequent fungi transmitted by the ipê-amarelo and ipê-roxo seeds had been: alternaria alternata, fusarium spp., aspergillus spp., phoma sp. and phomopsis sp.