|Dejong, Ted - U C DAVIS|
|Johnson, R Scott - U C DAVIS|
|Doyle, James - U C DAVIS|
Submitted to: Patent Application
Publication Type: Other
Publication Acceptance Date: April 9, 2004
Publication Date: May 10, 2004
Citation: Dejong, T.M., Ramming, D.W., Johnson, R., Doyle, J. 2004. Peach and nectarine rootstock named 'P30-135'. Patent Application. Serial Number 10/438,965. Interpretive Summary: P30-135 is an inter-specific hybrid (Prunus saliciana x P. persica) rootstock for peaches and nectarines that confer moderate vigor control, reducing tree size 10-20%. Peach trees grown on this rootstock are productive and require less pruning and have higher leaf calcium content than trees on Nemaguard, the standard rootstock. The problem is that commercial peach and nectarine trees are large and vigorous in growth and need to be summer pruned to let light into the tree to color the fruit better. Also since they are taller, ladders are required for most field operations, such as thinning, picking, and pruning. This rootstock would reduce the need to summer prune, reduce the use of ladders, and as a result reduce the cost of production of peaches and nectarines for the fresh and processing market.
Technical Abstract: P30-135 rootstock is an interspecific hybrid rootstock Prunus saliciana x P. persica, developed for use as a clonal commercial rootstock under peach and nectarine cultivars. Propagation of this stock has been successfully accomplished from hardwood cuttings. The P30-135 has the characteristic of imparting a substantial degree of vigor control to the scion cultivar that has been propagated upon it. This type of growth-controlling rootstock allows for the reduction of the height of orchard trees without compromising the quality of the fruit borne upon the tree. Size reduction of commercial orchard trees increases the efficiency of various cultural operations such as pruning, thinning, and harvesting by reducing the need for workers in the field to carry and climb all ladders.