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In a post about renovating mature pear trees there is a diagram (below) showing tree nomenclature as it pertains to pruning. In it, the letter "A" indicates suckers, and "E" marks shaded interior branches. What's the difference?

Another diagram I found references water sprouts - what are they and how are the different from the suckers or vertical branches?

Tree growth nomenclature

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IMHO they are pretty much the same thing (with various names, as happens in English), except that E has been let go long enough to make branches of its own (should have pruned more water sprouts last year.)

Regardless of what they are called, they should be removed.

Stark Brothers defines sucker as root-derived, water sprout as coming from the tree above-ground (so only the bottom two A's are suckers by their definition) Virginia Tech agrees (and that's their drawing below) so I'd suspect that this is generally accepted terminology in the industry, which the drawing you linked to does not happen to conform to.

VT extension tree pic

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Suckers are root based growth and especially detrimental on grafted trees.

They rob the desirable part of the tree above the graft of resources and if allowed will supercede and kill the graft. Once this happens, the tree reverts back to its hardier but less desirable rootstock species.

  • The desirability of the rootstock is relative to what you desire. For instance, if you have a dwarf pear tree with a quince rootstock and one day you decide you've never had quince and want to try it without buying a new tree … Anyway, great answer though. – Shule Dec 18 '14 at 4:06
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    Yes, there is that. Quince/Pear butter is one of the things I grew up on. Bit of one, bit of the other with peanut butter on an open-face sandwich, mmm. – Fiasco Labs Dec 18 '14 at 5:07

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