The Relation of Apple Scion and Rootstock to Longitudinal Trunk Bark Cracking1

in HortScience
Fenton E LarsenWashington State University, Pullman

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A high incidence of longitudinal trunk bark cracking was observed in an apple planting with 4 scion cultivars and 9 rootstocks between Nov., 1969 and Feb., 1972. The injury, occurring mostly in late Nov., was related to scion and rootstock. Almost no cracking occurred on ‘Wellspur’ and ‘Red King’ trunks. More cracking occurred on ‘Golden Delicious’ than ‘Goldspur’ on 3 rootstocks. With these 3 rootstocks, 96% cracking occurred with ‘Golden Delicious’/‘M 7’ and ‘MM 106’ and 52% with trees on ‘M 26’. With ‘Goldspur’ on 9 different rootstocks, the highest incidence of cracking was with trees on ‘M 7’ (85%) and ‘MM 106’ (82%) while 30% cracking occurred with trees on domestic seedling, and 4% with trees on ‘M 25’ No cracking was observed with ‘Goldspur’/‘M 26’. The greatest no. of cracks occurred on the S sector of the trunks with moderate amounts on the SE and E sectors with fewer cracks on all other sectors. The cracking appears to be low temp induced and the effect of rootstocks appears to be an effect on fall maturity of the scion.

Contributor Notes

Received for publication July 20, 1972. Scientific Paper No. 3874. College of Agriculture, Washington State University Research Center. Work was conducted under Project 1639.

Associate Professor, Department of Horticulture.

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