Fitotoxicidade de herbicidas aplicados em pós transplantio de mudas de maracujá amarelo

Abstract

-Brazil is the world's leading producer of passion fruit. However, for this crop, there are no records of herbicides for weed control. Thus, the aim of this study was to evaluate the effects of herbicide application after transplanting of yellow passion fruit seedlings during growth and phytotoxicity of the crop. Twenty-one herbicides with different mechanisms of action were tested by application at 35 days after transplanting (DAT). Phytotoxicity of the crop by the herbicides was evaluated at 63 DAT, and assessments of damage to seedlings were held at 70 days DAT. No herbicide caused damage to the root system of the passion fruit plants. The herbicides glyphosate, imazapic, metsulfuron-methyl and glufosinate-ammonium reduced plant height gain. The herbicides atrazine, linuron, metribuzin, diuron, tebuthiuron and bentazon reduced leaf dry matter, stem dry matter and total dry matter of the plants. Fluazifop-p-butyl reduced height gain and leaf dry matter. Herbicides that caused the greatest damage to seedling growth also caused the greatest phytotoxicity. The herbicides oxadiazon, fenoxaprop-ethyl, tembotrione, chlorimuron-ethyl and isoxaflutole did not hinder growth and did not intoxicate the seedlings; they were the most promising for use in the total area. Keywords: Passiflora edulis; selectivity; weeds Resumo -O Brasil é o principal produtor de maracujá do mundo, todavia, para esta cultura não existe registro de herbicidas no controle de plantas daninhas. Sendo assim, o objetivo deste experimento foi avaliar os efeitos da aplicação de herbicidas após o transplantio de mudas de maracujá amarelo no crescimento e intoxicação da cultura. Foram testados 21 herbicidas de diferentes mecanismos de ação aplicados aos 35 dias após transplantio (DAT). Aos 63 dias DAT foram avaliadas as intoxicações causadas pelos herbicidas na cultura, e aos 70 dias DAT foram realizadas as avaliações dos danos causados às mudas. Nenhum herbicida causou danos ao sistema radicular das plantas de maracujá. Os herbicidas glifosate, imazapic, metsulfuron-methyl e amonioglufosinate, causaram reduções no ganho em altura das plantas. Os herbicidas atrazine, linuron,

Indaziflam Application in Newly Transplanted Arabica Coffee Seedlings

“…However, plant damage did not exceed 10% and 20% for cultivars IBC 12 and 144, respectively ( Figures 4A and 4B). These values are within acceptable levels, since plants are expected to recover from the damage caused by the herbicide (Paiva et al, 2015), as observed in this study over the days. Cultivar IBC 12 was more tolerant than 144 due to lower symptoms and persisted for a shorter period.…”

Phytotoxicity of Herbicides in Seedlings of Sweet Passion Fruit

“…As Paiva et al (2015), the herbicides oxadiazon, fenoxaprop-ethyl, tembotrione, chlorimuron-ethyl and isoxaflutole, did not jeopardize the growth or intoxicate the yellow passion fruit seedlings, being the most promising for use in total area.…”

“…The herbicides glyphosate, imazapic, metsulfuron-methyl and glufosinate-ammonium reduced plant height gain (Paiva et al, 2015). According to Polini et al (2018) to application of herbicide glyphosate was the least selective to the tree species in its different concentrations, causing phytotoxic effects with changes in the seedlings morphology.…”

“…In similar work, Paiva et al (2015) noted that no herbicide did damage the root system of plants, to assess the effects of the application of herbicides after transplanting of seedlings of yellow passion fruit.…”

“…Paiva et al (2015) observed that of the 21 herbicides tested, at least four have caused reductions in height gain. These authors also observed that only the herbicides oxadiazon, fenoxaprop-ethyl, tembotrione, chlorimuron-ethyl and not harm growth and isoxaflutole not intoxicated the seedlings, being the most promising compounds for use in total area.…”