S.D. Codified Laws § 38-21-34
Applicator's license--Limitations
No applicator may hold more than one applicator's license simultaneously. Any private applicator's license held by a commercial applicator shall become invalid upon issuance of a commercial applicator's license by the secretary.
Source: SL 1955, ch 73; SDC Supp 1960, § 22.12B05; SDCL, § 38-21-10; SL 1974, ch 255, § 5; SL 2020, ch 174, § 10.