EFFECT OF THE SUCUPIRA (Pterodon emarginatus Vog.) EXTRACT ON THE DEVELOPMENT OF PLANT PATHOGENIC FUNGI AND BACTERIA

Abstract

The objective of this work is to evaluate the effect ";in vitro"; of the sucupira extract (Pterodon emarginatus) on plant pathogenic fungi and bacteria. The sucupira extract was obtained from sucupira pods. In the evaluation of fungal development, the sucupira extract and tebuconazole fungicide significantly decreased the mycelium growth of Alternaria brassicae, Fusarium oxysporum, Rhizoctonia solani and Ceratocystis fimbriata. However, tebuconazole resulted in greater decrease than sucupira extract, except to A. brassicae fungus. The efficacy of the sucupira extract was 70%, 74%, 62% and 82% of A. brassicae, F. oxysporum, R. solani and C. fimbriata, respectively. Tebuconazole efficacy was 93.6% for A. brassicae and 100% for the other fungi. In the bacterial growth evaluation, results showed that efficiency gradually increased as sucupira extract concentration increased. However, there was an inverse effect on the treatment of sucupira extract 100%. The high viscosity of sucupira extract might have negatively affected its ability to disperse through the PDA, which, in turn, caused the output of smaller inhibition halos. The sucupira extract 10% was significantly the best treatment, however, the sucupira extracts at 1% and 10% significantly inhibited the development of Clavibacter michiganensis subsp. michiganensis, Xhantomonas campestris pv. campestris and Pseudomonas syringae.

KEY-WORDS: Fungal growth; bacterial development; natural fungicide; bactericide.