Micro Grafting by Ian Tolley OAM

How-To-Video: "The Micro Grafting method offers an opportunity to use smaller, more immature scion wood (as small as 2 mm diameter) that is compatible with a small rootstock of similar age. Early micro grafting can reduce production time of the tree considerably.
An alternative to Micro Grafting is Mini Grafting. Mini Grafting attaches very active scion tips to small rootstock plants of 2 mm diameter or less. The earliest practical grafting method is Mini Grafting that is very adaptable to large scale production in a controlled, insect-proof house with good humidity control.
The technique is as follows. Use a caliper gauge to determine the diameters of both scion and rootstock. This makes the matching process quicker and easier, and will reduce mismatching errors.
The two buds at the top of this graftstick are all that is needed to provide at least one single shoot which can develop into a singlepole tree. Cut the leaf petioles just above the bud to protect the bud during the grafting process. Create a wedge on the graftstick by cutting both sides into a shallow tapered end for insertion into the rootstock.
Holding the rootstock stem firmly, split the top to receive the wedge base of the shoot tip. It is much easier to maintain vertical control of the knife by slicing at 45degrees. Take care when inserting the graft to make sure that the cambium to cambium contact is maximised. Use 2-3 cm of Parafilm and stretch as shown to increase the tension which will hold the rootstock halves tightly against the scion wedge.
Pinch the Parafilm tightly with your thumbnail against your index finger, then stretch an extra wrap around the union to guarantee a firm bond. Stretch the remaining Parafilm to cover the rest of the graft. This will maintain constant humidity and stimulate callous formation."
Excerpts from Commonsense Citrus - Chapter 7 - Propagation - Micro Grafting
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