The Inheritance of Resistance to Woolly Aphid,Eriosoma Lanigerum(HSMNN.), in The Apple

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Abstract
The world literature on the resistance of cultivated varieties of apple to Eriosoma lanigerum is critically surveyed, and a list of 18 varieties found immune or highly resistant by at least three independent workers is provided. In addition, 19 varieties are tabulated that have been variously described as immune (or highly resistant) and susceptible in different localities. Well authenticated but conflicting reports on a further 43 varieties confirm that biologic races of the aphid must exist. Despite this, Northern Spy has maintained an outstanding level of resistance wherever it has been tested. This resistance is shown to be controlled by a single dominant gene, Er, having little or no minor gene background. This gene appears to be closely linked with an incompatibility gene. The gene Er has considerable potential value in breeding for resistance in rootstock and scion apple varieties.

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