Measurement of Horizontal Resistance

Absolute measurements of horizontal resistance are technically difficult for a number of reasons. Horizontal resistance cannot be measured directly and, in fact, it can be measured only in terms of the level of parasite damage. However, the level of parasite damage is itself difficult to assess, particularly when a number of different parasites are involved. Furthermore, horizontal resistance is not the only factor controlling the level of parasite damage. Epidemiological competence (see 7.2.2) is also an important factor, and it can vary from season to season.

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