Sources of Major Error

There are several sources of serious error, which add immensely to the problems of measuring horizontal resistance. Indeed, these errors often suggest that the available levels of horizontal resistance are inadequate and, further, they suggest that horizontal resistance never can be adequate. These errors are largely responsible for the reluctance of plant breeders to work with horizontal resistance during the twentieth century. These breeders concluded, excusably, but incorrectly, that horizontal resistance was of little use to them. Obviously, these errors are of major importance, and a clear comprehension of them is essential.

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