False Reports of Vertical Resistance

Failures of resistance have occasionally been falsely reported in the scientific literature as the breakdown of vertical resistance. There are various reasons for this type of error.

First, it has often been assumed that vertical resistance is the only kind of resistance that exists. Consequently, it was assumed that any apparent failure of resistance must be a failure of vertical resistance. The most common reason for a false failure of resistance is an inadequate testing of a new cultivar. Believing it to be resistant, the scientists release the new cultivar to farmers, and it later transpires that it is susceptible. It is then all too easy (and very tempting) to blame nature rather than to admit to one's own carelessness.

Alternatively, there may have been a differential interaction which, however, was not a Person/Habgood differential interaction (see 4.5).

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