Pyrus calleryana

D6 is a common Pear rootstock which is vigorous and crops heavily producing large top quality fruit but it is slower to bear. Suitable to numerous soil types. It is good on lime induced chlorosis and copes well on damp heavy soils. D6 is resistant to fireblight, leaf spot and wooly aphid but susceptable to pear blast and has average protection to crown galls, collar rot and mildew. Overall it is a reliable productive rootstock.