Over vroege vormen van projectonderwijs in Utrecht.

At the occasion of the Centenary of the Netherlands Society of Plant Pathology a reflection on past, present and future of plant protection, the subject matter of the Society, was thought to be appropriate. Developments in plant protection are projected against a general stream of thought. Three turning points are distinguished which can be seen as paradigm changes. The first occurred around 1890, when the concept of pathogenitism gained its final victory over autogenitism. The second occurred around 1940, when the public outlook on human and plant health changed drastically due to the advent of chemotherapeutants. The third occurred around 1990 when a clear change in public thinking on agriculture, environment and plant protection became apparent. The background of these changes is sketched in a personal manner. Some ideas on plant protection beyond the year 2000 are given, based upon recent developments in the Netherlands to which the Society contributed in its own way