SDCL § 29A-2-608: Exercise of power of appointment.

In the absence of a requirement that a power of appointment be exercised by a reference, or by an express or specific reference, to the power, a general residuary clause in a will, or a will making general disposition of all of the testator's property, expresses an intention to exercise a power of appointment held by the testator only if (i) the power is a general power and the creating instrument does not contain a gift if the power is not exercised or (ii) the testator's will manifests an intention to include the property subject to the power.

Source: SL 1995, ch 167, § 2-608.