<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: KSQ2</div><div class="ubbcode-body">What are the advantages and disadvantages of the semi-dwarf trees? I would imagine you could never use dwarf trees where attracting deer is the purpose. </div></div>
I think most use semi-dwarf to split the difference in pros/cons but here's a few links on the subject.
Dwarf versus Semi-Dwarf versus Standard Trees
WHICH APPLES SHOULD I CHOOSE?
All about Apples
It's all about the rootstocks:
<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body"> Standard Trees versus Dwarf Trees
The two major factors influencing size are rootstock and type of strain used (spur or non-spur). Other factors that will have an influence on ultimate tree size include general care, variety, soil type, earliness of fruiting, location within the state and timing and severity of pruning.
Rootstock influences tree size. There are three general categories of tree size: standard, semi-dwarf and dwarf. Standard trees are propagated on seedling rootstock and produce large trees that may get to be 15 to 20 feet tall. Semi-dwarf trees are trees propagated on one of several clonal rootstocks (vegetatively propagated) that produce trees that will be about 60 to 70 percent the size of standard trees if grown under similar circumstances. The most common semi-dwarf rootstocks used for apples in Georgia are MM 106, MM 111, and M 7. Trees on M 7 will produce the smallest trees in the semi-dwarf category while MM 106 will produce trees nearly as large as trees on seedling rootstocks.
True dwarf trees will be about 30 to 40 percent as large as standard trees and require support by either a trellis or a post. The two most common dwarfing root-stocks are M 9 and M 26. Trees grown on M 9 are the smaller of the two.
Use dwarf and semi-dwarf trees if space is greatly limited. M 9, M 7, and MM 111 are better adapted to Zones 1, 2, and 3, while MM 106 has shown promise in the lower half of Zone 3 plus Zone 4. In Zone 5, only standard trees (seedling rootstock) are recommended due to poor performance of semi-dwarf and dwarf rootstocks. See Table 2 for tree spacing recommendations.
</div></div>
Dwarf rootstocks are not as strong as semi or standard but you can fence them and stake them of course.
There are all kinds of fencing ideas that allow deer to feed on the dropped apples but not harm the tree.
Most of mine are EMLA111 rootstocks which are better for my heavier ground although I do have on M9...time will tell I guess /forum/images/%%GRAEMLIN_URL%%/wink.gif