| Corn rust requires chemical fungicides as the main method for its control. This research aimed to evaluate the spore germination of the fungus Puccinia polysora, responsible for corn rust, using static aqueous extract of guaco (Mikania glomerata). The extract was obtained by hydrating whole leaves of guaco in distilled water and then it was kept in the refrigerator for 24 hours. Afterwards, the extract was filtered with filter paper and diluted in water until it reached the concentrations of 1, 2, 3, 4 and 5%. The control was prepared with distilled water. Aliquots of 40 µL of the extract and 40 µL of spore suspension of P. polysora (1 x 104 spores mL-1), obtained in a commercial farming area in Toledo (Paraná, Brazil), were spread over the surface of a... |
