The verification of the efficacy of neem oil requires
controlled and structured experimental studies despite
the many recorded scientific facts of the efficacy of neem
compounds. Also the changing global scenario toward
the use of cheap, available and non-toxic plant products
having traditional medicinal uses and the development of
modern drugs for the control of various diseases from
neem and other plants should be emphasized. In fact the
United Nations have declared neem as the ‘tree of the
21st century’.