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Estudou-se o efeito do etefom nas doses de 0,96, 1,44 e 1,92kg/ha, do tidiazurom, a 0,075kg/ha, e de misturas contendo 0,48 + 0,05, 0,96 + 0,05 e 1,44 + 0,05kg/ha de etefom e de tidiazurom, respectivamente, na desfolha do algodoeiro e na deiscência e seus frutos. Avaliações realizadas aos 7 e aos 14 dias após a pulverização dos produtos e de suas misturas indicaram que os mesmos, excetuando-se a dose 0,96kg/ha isolada de etefom e aos 7 dias após a aplicação, promoveram sensível desfolha do algodoeiro. O etefom acelerou a deiscência dos capuchos do algodoeiro a partir da dose 1,44kg/ha, o que não se observou para o tidiazurom. Os resultados indicaram que os produtos, quando aplicados conjuntamente, não possuem ação antagônica. Os diversos tratamentos não diferiram estatisticamente entre si na produção de algodão. The defoliation and fruit dehiscence of cotton plants were evaluated by applications of Ethephon (rates: 0.96, 1.44 and 1.92kg/ha). Thidiazuron (0.075kg/ha) and the mixture of both Ethephon plus Thidiazuron (0.48 + 0.05, 0.96 + 0.05, and 1.44 + 0.05kg/ha, respectively). The mixture of the products was done in the sprayer tank. Observations of the cotton plants were carried out at seven and fourteen days after application of the products. Except for the application of Ethephon at the rate of 0.96kg/ha, it was observed that the three treatments were effective in promoting cotton defoliation. It was also verified that Ethephon at the rates of 1.44kg/ha accelerated fruit dehiscence while Thidiazuron did not. Antagonic action of the products was observed when applied in mixture. The isolated application of the products or the mixture had no effect on cotton yield

Utilização do etefom e do tidiazurom na desfolha do algodoeiro e na deiscência de seus frutos