Several of my Aglianico vines (now in their third leaf) keep putting out suckers from the rootstock (1103 – Paulsen). There are several factors that could contribute to this:
- Planting the vines too deeply (which we did)
- More than usual rainfall (which happened this year)
- Disrupting the root area (which we did when we put in T-posts recently)
- Excessive fertilization (which might lead to excessive rootstock vigor)
- Greater than expected soil fertility (see previous point)
Five variables, subject to numerous combinations and variations leads to a number of permutations that I have not even begun to grasp yet.
There is a lot of talk in viticulture circles (academic and practical) about matching rootstock vigor to scion vigor and site vigor. I need to research this in more detail so I know what is contributing to this emergence of rootstock suckers in my vines and then know how I can control or manage that.
In the meantime, I will continue digging and cutting these suckers away and will welcome thoughts and experiences.