The Tenth International Conference on Plant Growth Substances was held July 22-26,1979 at the Wisconsin Center of the University of Wisconsin-Madison under the joint sponsorship of The International Plant Growth Substances Association (IPGSA) and the Graduate School of the University. More than 500 persons, including 423 regis tered participants, attended the Conference. Financial support was generously provided by the organizations listed under Acknowledg ments. The Conference was planned and hosted by a Local Committee in response to a request from Professor Dennis Carr, Secretary of IPGSA,...