ABSTRACT:
The present study aims to investigate garlic, pepper and coriander plant extract as well as neem and orange peel essential oil effective ness to controlAlternaria alternata and Alternaria dauci and their efficiency during carrot seeds germination and emergence. A completely randomized design was used in three different experiments. The first experiment evaluated the effect of plant extracts and essential oils on the incidence ofA. alternata and A. dauci . It was done by means of a factorial design applied to five treatments (garlic, pepper, coriander, and neem and orange peel essential oils) at three concentrations (10, 20 and 30%).They also evaluated the controls untreated and with fungicide (Thiram).The second experiment evaluated the effect of the treatment at30% concentration on the germination and emergence of seedlings assessed on trays, and in the third experiment, the presence ofA. alternata and A. dauci on the pericarp, endosperm and on the embryo.A. alternata showed higher incidence than A. dauci. The garlic extract and the orange essential oil showed the potential to control A. dauci andA. alternata, because their lower concentrations were able to sufficiently reduce the incidence of these fungi and because they do not affect carrot seeds germination and emergence.A. alternata conidia were found on the embryo (8%), pericarp (17%) and endosperm (31%).
Key words:
Alternaria spp.; seed treatment; alternative control.
