The antifungal effectiveness against rose powdery mildew using antimicrobial nanosilver colloidal solution was investigated. Double-capsulized nanosilver was prepared by chemical reaction of silver ion with aid of physical method, reducing agent and stabilizers. The average diameter of nanosilver was about 1.5 nm. They were highly stable and very well dispersive in aqueous solution. The Transmission electron microscopy and UV-vis spectrometer were used for measurements of size analysis and their stability, respectively. The nanosilver colloidal solution of concentration of 5000 ppm was diluted in 10 ppm of 500 kg and sprayed at large area of 3306 m2polluted by rose powdery mildew. The white rose powdery mildew fade out above 95 % after 2 days and was not recurred for a week. The antifungal effects were observed by an optical microscope and photographs.

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CNTs have been synthesized by catalytic C 2 H 2 decomposition through Pd/Al 2 O 3 at low temperature. The CNTs were grown to a length of about 10 µm and diameter 150-200 nm with multiwalled structure. Pd catalysts have two major roles; one is the active catalyst for C 2 H 2 decomposition, the other is a nucleation site of CNT's growth.