Research Bulletin (Iowa Agriculture and Home Economics Experiment Station)


This bulletin contains a record of progress in a study of the effect of crown gall upon an apple orchard from the time it is set out until it becomes of bearing age. The relative influence of various types of galls upon the annual growth of the trees has been considered and some data have been gathered on the amount and position of the galls in relation to the growth and percentage of stand in the orchard. Also, the susceptibility of certain kinds of apple trees to crown gall after they have been planted in the orchard, and the persistence of crown gall on infected trees have been noted.



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