Optimization of the factors affecting sex of squash plants of the morphotype «Zucchini»

Experimental data of two years study of the factors that influence on the plant sex of «zucchini» aimed at raising the level of hybridity for industrial hybrid seed production are shown. Seeds vernalization and treatment by preparations containing 2-chloroethylphosphonic acid were used to increase the number of female flowers on the parent plants. The exposure to silver nitrate and gibberellin on the paternal lines increased the number of male flowers.