Survey, pathogenicity and transmissibility of fungi by “sabiá” seeds (Mimosa caesalpiniaefolia Benth)

Abstract

Survey of fungi associated with seeds of Mimosa caesalpiniaefolia was carried out in gerbox with 200 ppm of streptomycin sulphate, at the Plant Pathology laboratory of Phitopathology - EMBRAPA, in Aracaju city (Brazil). Fungi isolated from surface of sterilized seeds were as follows: Fusarium solani 28.5%; Phomopsis sp. 4.5%; Pestalotiopsis sp. 9.5%; Colletotrychum gloeosporioides 6.0%; and Aspergillus spp. 4.0%. Seeds without surface sterilization yielded the same fungi although in different percentages: F. solani 27.5%; Phomopsis sp. 14.0%; C. gloeosporioides 9.0%; Pestalotiopsis sp. 5.0% and Aspergillus spp. 0.5%. Pathogenicity tests revealed that when sprayed on seedlings F. solani caused wilt in 10.0% of them, while Pestalotiopsis sp. induced small white-greyish leaf spots on 6.0% of seedlings. The following fungi were isolated from seeds that failed to germinate: Pestalotiopsis sp. 8.5%, C. gloeosporioides 0.5%; F. solani 7.5% and Phomopsis sp.1.5%. Fungi isolated from seeds could not be transmitted to seedlings.