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No presente trabalho foi estudado o efeito da aplicação de ethephon na expressão do sexo em plantas de abóbora tipo tetsukabuto. O experimento foi conduzido no delineamento em blocos ao acaso e analisado num esquema fatorial 3 x 4, mais a testemunha, sendo o primeiro fator constituído pelas doses de ethephon (100, 200 e 300mg.L-1) e o segundo pelo número de aplicações semanais (1, 2, 3 e 4). O ethephon promoveu um ginoicismo temporário nas plantas de abóbora. Há redução na relação entre o número de flores masculinas e femininas com o aumento da dose de ethephon. A dose de 300mgL-1 de ethephon aplicada três ou quatro vezes é a mais indicada para o tratamento das plantas de abóbora. This work aimed to study the effect of ethephon in the sex expression in tetsukabuto type squash plants. The experiment was conducted using a randomized complete block design, in a factorial analysis (3 x 4). The first factor was the ethephon doses (100, 200 and 300 mgL-1) and the second the number of weekly applications (1, 2, 3 and 4). Ethephon promoted a temporary ginoicism, reducing considerably the labor of male flower elimination in female parents. A reduction was observed in the ratio between male and female flowers and the increasing doses. In addition, female flowers tended to increase in the early nodes. Doses of 300 mgL-1 of ethephon applied three or four times was the best treatment and might be used for squash hybrid seed production

Utilização do ethephon para a produção de sementes de híbrido de abóbora tipo tetsukabuto