Efeito de diferentes extratos de plantas sobre a germinação de sementes e o vigor de plântulas de feijão inoculadas com Colletotrichum lindemuthianum

Abstract

Anthracnose (Colletotrichum lindemunthianum) is considered the main disease that attacks the bean crop. Most producers make use of own seeds and often are already infected by the fungus, which, coupled with the lack of efficient control products, even more difficult to obtain healthy crops. The use of extracts parace be an alternative, however, it should not cause damage to seedlings. Therefore, this study aimed to study the effect of eucalyptus plant extracts (Eucalyptus grandis) and lemongrass (Cymbopogon citratus) on the physiological potential of seedlings and seeds infected by the fungus. To conduct the experiments was first prepared aqueous crude extract (EBA) to 10% of each plant. Subsequently each of the extracts at different concentrations were applied on paper germitest received infested bean seeds artificially with the fungus. The evaluations carried out consisted in the percentage of seed germination beyond the shoot height, root length and fresh weight of root seedlings. The results showed that for all variables, the interaction extract and concentration was significant. Most pronounced effects were observed in the assessments carried out radicle, whose length was negatively interfered by eucalyptus EBA, unlike the lemon extract, which stimulated growth, verifying that same behavior to the dry weight of radicle.