The role of growth regulators in the reduction of xenobiotic pesticide exposures in the hybrid tea rose culture

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Phytotoxic-chemical burn is a very common occurrence in modern agriculture, which leads to a noticeable decrease in the productivity of cultivated plants. The use of growth regulators with immunoprotective functions can neutralize the harmful effects of this phenomenon. Studies conducted on three varieties of hybrid tea roses (Red Naomi, Avalange and Jumilia) showed that growth regulators significantly reduced the xenobiotic effect of those used in the technology of growing cut crops in greenhouses. A higher protective effect against pesticide burn was observed when rose bushes were sprayed with a preparation from the class of brassinosteroids – Epin-extra. In this variant, there was a significant decrease in the manifestation of leaf burn, depending on the variety, by 2.4–3.8 times compared with the control. The protective effect of the drug from the group of poly-beta-hydrooxibutyric acid, Albite, turned out to be somewhat lower. Burn marks in this variant were 1.2–1.5 times less than in the control variant. The least protective effect against chemical burns was observed when rose plants were treated with a preparation of the gibberellin class, Buton II. The treatment of hybrid tea rose bushes with growth regulators in protection against pesticide burns significantly increased the yield of marketable products when cultivated in closed ground. The use of Epin-extra provided the highest yield of marketable shoots on average over four series of experiments for the Avalange variety by 43%, for the Jumilia variety by 46%, and for the Red Naomi variety by 44% compared to the control. Among the varieties studied, Avalange proved to be more resistant to chemical burn and the most productive in all climatic seasons of the year. In descending order of the productivity of a hybrid tea rose, the seasonal periods can be arranged as follows: summer-spring-autumn-winter.