The success of mass micropropagation of fruit trees may be reached by us-ing plant tissues culture techniques, since this has shown efficient results on seedling production with high quality and health. Preliminary experiments were carried out to define the constitution of culture medium that provides better re-sults, in multiplication as well as in vitro rooting and acclimation methods of blackberry cv. 'Triple Crown' (Rubus fruticosus L.). The best survival percentage was 90% when both shoot tips and stem segments were treated with 40% sodium hypochlorite for 30 minutes. Murashige and Skoog (MS) medium supplemented with 2.0 mg BA+0.5 mg 2ip/l was the most efficient treatment on in vitro multiplication of blackberry inducing a higher number of shoots was 7.78 shoot/ explant. Also the combinations of MS medium with NAA and BA improved the multiplication of blackberry in vitro, the highest value was 4.42 shoot/explant that was observed in the presence of 1.0 mg BA combined with 0.1 mg NAA /l. The best rooting condition for explants of the blackberry was reached by keeping the explants in full strength MS medium enriched with 2.0 mg IBA+0.5 mg NAA/l which produced long roots with sub roots which were thick and involved in medium

The beneficial effects of boron, zinc and active dry yeast on yield and fruit quality of Zaghloul date palm grown at the Experimental Orchard, Faculty of Agriculture, Assiut University, Egypt was studied during 2011, 2012 and 2013 seasons.The experiment was set up in a complete randomized block design with ten replications of one bunch each. All treatments were sprayed two times at after set and one month later. The obtained results could be summarized as follow: Boron, zinc and active dry yeast spraying significantly increased the fruit retention percentage and bunch weight compared to untreated one. Yeast application had more effective compared with boron or zinc application. Spraying either yeast, boron or zinc at any concentration was accompanied with improved fruit quality in terms of significantly increased fruit weight, total soluble solids and sugar contents. No significant differences between spraying with yeast 250 or 500 ppm, 500 or 1000 ppm zinc, as well as, boron at 1000 or 2000 ppm. Moreover, active dry yeast spraying revealed highest improvement of yield and fruit quality. So, it concluded that spraying either of boric acid, zinc sulphate or active dry yeast twice at after fruit set and one month later increased the yield and improved the fruit quality of Zaghloul date palm. Moreover, using yeast had more effective than using either boric acid or zinc sulphate

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