Abstract
It is shown that, by utilizing radial advance as a measure of invasion, the change in resistance to attack of fungal species during storage can be followed. A comparison is made of the virulence of certain species or strains and of variation in resistance to invasion shown by different populations of given varieties of apples during storage at 3[degree] and 12[degree] C. The significance of these comparisons has been estimated by calculation of probable errors, which was shown to be legitimate in a previous paper. The bearing of the results on the problem of disease resistance is discussed.

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