This experiment was carried out at the Experimental station of the faculty
of Agriculture, Assiut University during two successive seasons 2016/2017 on
Red Roomy grapevines. The beneficial effects of spraying Dormex at 4%, Salicylic acid at 5%, Garlic oil at 2%, camphor oil at 2% and Lemon grass oil at 2%
on bud break and improve the Red Roomy production under warm climate were
investigated. The experiment was arranged in a complete randomized design with
three replicates per treatment, one vine per each. The results indicated that all
treatments were very effective on breaking bud dormancy and improving the
yield and quality of the berries compared with the check treatments. The best results regarding the improvement of cluster compactness coefficient, number of
berries and berry setting were obtained with spraying lemon grass oil at 2% and
camphor oil at 2%. No significant differences were found between Dormax and
the other compounds.
It could be concluded that using plant extracts i.e lemon grass oil, camphor
oil and garlic oil as natural and safety substances were very effective to break
bud dormancy and improve the grapevines fruiting.