Tom,
I just wonder if the use of pesticides had been more reasonable, then maybe a total ban wouldn not have been necessary. I personally blame intensive agriculture and the domestic use of products by uncompetent individuals (proven to be the biggest polluters).
When you think that a golf course of say, 60 to 80 hectares has approx. 1.5 hectares of greens and maybe 1 hectare of tees. The small percentage of sprayed areas is peanuts for a problem that is all too often associated with golf.
Unfortunately, some golf clubs insist on green, striped surfaces, including fairways (another 10 to 15 hectares). If all these areas are over watered and over fed, then the amount of pesticides needed is multiplied. Was this the case on these Dutch courses, I don't know ?
Here in France, it was recently agreed that water restrictions will not effect the controlled watering of greens. I would like to see a similar policy for pesticides.
If we want good slick greens then water and some pesticides are essential.