In apple, budding is done in the month of :- (RJ AARO Horti. 2014)

✅Explanation:
Budding in apple trees is ideally carried out during the dormant season when the sap flow is minimal. This typically falls in late winter or early spring, which corresponds to February-March in many apple-growing regions. Budding during this period allows the bud to heal and establish a good union with the rootstock before active growth resumes.
Additional information: Probation method of apple

•  Grafting Methods:
-Whip, Tongue, Cleft, and Roots grafting.
-Best results with Tongue and Cleft grafting at 10-15 cm above the collar.
-Grafting typically done in February-March (end of winter).

•  Budding:
-Shield budding is most common, with high success rate.
-A single bud with a shield piece of stem is inserted beneath the rootstock rind through a 'T' incision.

✏️Budding time:
-September: Kashmir Valley, Kumaon hills (Uttaranchal), high hills of Himachal Pradesh.
-June: Mid hills of Himachal Pradesh.

•  Rootstocks:
-Common: Wild crab apple seedlings.
-Other: Golden Delicious, Macintosh, Granny Smith (diploid cultivars).
-Dwarfing: M9, M4, M7, M106.