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*- The First Symposium on date Palm in Saudi Arabia, Al-Hasa, Saudi Arabia, 1982.
*- The Sixth Symposium on the Biological aspects of Saudi Arabia, Saudi Biological Society. Jeddah. Saudi Arabia. 1983.
*- The Seventh Symposium on the Biological aspects of Saudi Arabia, Saudi Biological Society, Qassim, Saudi Arabia., 1984.
*- The Eight Symposium on the Biological aspects of Saudi Arabia, Saudi Biological Society, Riyadh. Saudi Arabia. 1985.
*- The Ninth Symposium on the Biological Aspects of Saudi Arabia, Saudi Biological Society, Riyadh, Saudi Arabia, 1986.
*- The Second Symposium on date Palm in Saudi Arabia, Al-Hasa, Saudi Arabia. 1986.
*- The Tenth Symposium on the Biological Aspects of Saudi Arabia, Saudi Biological Society, Riyadh, Saudi Arabia, 1987.
*- The National seminar on Genetic Engineering and Biotechnology, Riyadh, 1987.
*-The Eleventh Symposium on the Biological Aspects of Saudi Arabia, Saudi Biological Society, Yanbu, Saudi Arabia, 1988.
*-The Twelfth Symposium on the Biological Aspects of Saudi Arabia, Saudi Biological Society, Riyadh, Saudi Arabia, 1989.
*-The Thirteenth Symposium on the Biological Aspects of Saudi Arabia, SaudiBiological Society, Riyadh, Saudi Arabia, 1990.
*- The Third Symposium on date palm in Saudi Arabia, Al-Hasa, Saudi Arabia, 1993.
*-The Fourteenth Symposium on the Biological Aspects of Saudi Arabia, Saudi Biological Society, Riyadh, Saudi Arabia, 1993.
*- The Fifteenth Symposium on the Biological Aspects of Saudi Arabia, Saudi Biological Society, Makkah, Saudi Arabia.
*- The Sixteenth Symposium on the Biological Aspects of Saudi Arabia, Saudi Biological Society, Riyadh, Saudi Arabia, 1995.
*- The Seventeenth Symposium on the Biological Aspects of Saudi Arabia, Saudi Biological Society, Qassim, Saudi Arabia, 1996.
*- First Saudi Seminar for Agricultural Sciences, College of Agriculture, King Saud University, Riyadh, Saudi Arabia, 1997.
*- Eighteenth annual meeting of ecological pollution and biological aspects of Saudi Arabia, Saudi Biological Society, Yanbu, Saudi Arabia, 1998.
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