Most crop protection chemicals require considerable expertise in their use. This expertise is required first of the person who decides which chemical should be used. All too often, this decision depends on a sales representative, and pesticide use is then governed, at least in part, by irrelevant factors, such as advertising and sales skills. The same criticism applies to the rates of application, which are often too high, or too frequent, because of an over-zealous sales pitch. The farmer himself, and his employees, also require expertise, if the pesticide is to be fully effective, and the safety precautions are to be properly implemented. All too often, this expertise is either lacking or inadequate. It need scarcely be added that, at the farmer level, the control of parasites by the use of horizontally resistant cultivars requires no expertise whatever.

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