Potencial de controle do azevém (Lolium multiflorum) com óleos essenciais

Abstract

The ryegrass (Lolium multiflorum) is one of the main weeds in southern Brazil. This weed species presents many difficulties to control, especially due to herbicide resistance. In this sense, it is important to carry out research that can find new ways to control this important weed species. Thus, the objective of this project was to evaluate the potential of ryegrass control with essential oils of Cintronella (Cymbopogon nardus), eucalyptus (Eucalyptus sp.), orange (Citrus sinensis), lemongrass (Cymbopogon citratus), carqueja (Baccharis articulata) and lemon balm (Melissa officinalis). Tests were conducted with application of essential oils in seeds and seedlings of the target species. A completely randomized experimental design with five replications was used. The experiments were allocated in a 6x5 factorial scheme, the first factor consisting of essential oils (citronella, eucalyptus, orange, lemongrass, carqueja, lemon balm), the second by essential oil doses, with 0, 5, 10, 25 and 50 g L- 1. The tests with application on seeds were carried out in the laboratory, with germination on paper. Assays with application on seedlings, they were cultivated in pots with substrate, and later application was performed on their aerial part. The germination, germination speed index, mortality, phytotoxicity, height and dry mass of ryegrass were evaluated.