Horizontal Resistance and Crop Protection Chemicals Compared

It must be emphasised that, in this book, herbicides are excluded from the term 'crop protection chemicals'. Crop protection chemicals are taken to mean any substances used to kill or inactivate the parasites of crops. Weeds are competitors, not parasites, and they are not part of this discussion. Equally, other agricultural chemicals, such as artificial fertilisers, are not included in the term 'crop protection chemicals'.

There is one overwhelming advantage, and there are seven quite serious disadvantages, to the use of crop protection chemicals.

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