Grapevines "Crimson" suffer from the problem of poor coloration under their growth conditions
in many Egyptian farms, mainly due to high temperature day and night especially at maturity. This study aimed
at using low concentrations of Brassinoloid (0.5, 1.0, or 2 ppm) alone or in combination with ABA
(Commercially known as ProTon) (200 ppm). Spray was done twice at veraison and one week later. The results
revealed that Brassinoloid (Br) at low concentration resulted in better quality of "Crimson" grapes. The
combination of Br at 0.5 ppm plus ProTon had the best outcome when compared with the control or with other
treatments especially on enhancing anthocyanin formation and improving the shelf life of treated berries.