Abstract
The costs of plant protection on a national basis were calculated using the Netherlands, 1978, as an example. A combination of public statistics and enquiry data yielded a value of total costs due to pests and diseases of over one billion (109) guilders, of which 10 % for public expenses, 58 % for private expenses, and 32 % for residual damage. Very preliminary estimates of cost effectiveness in terms of marginal benefit/cost ratios were 16 for « inspection and control » 90 for « research » 10 for « teaching » and about 4 for « private expenses » and for « overall cost effectiveness ». Such data have limited meaning when the delay times for various types of crop protection activities are disregarded.
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