Marianna plum rootstock variety named `M40`

Abstract

A new and distinct cultivar of Marianna rootstock that originated as an open-pollinated seedling is provided. The new cultivar is particularly well suited for use as prune rootstock. When compared to the previously utilized Marianna `2624` cultivar, it is found that the new cultivar exhibits superior root anchorage and a significantly reduced tendency to form unwanted suckers. Also, the new cultivar when compared per se to the Marianna `2624` cultivar is found to set considerably more fruit, to form smaller fruit, and to possess a pit that is considerably smaller. Good wet soil tolerance is exhibited. The new cultivar propagates well by the use of cuttings.

We claim: 
     
       1. A new and distinct cultivar of Marianna plum which exhibits the following combination of characteristics: (a) superior rooting anchorage when compared to the Marianna `2624` cultivar (non-patented in the United States),   (b) a substantially lesser propensity to form suckers than the Marianna `2624` cultivar, and   (c) the ability to well serve as a prune rootstock;