For the purpose of this subchapter, the person responsible for the condition of any premises is the person using or occupying the same; or, in case no person is using or occupying the premises, the person who by law is entitled to the immediate possession of the same; or, in case the premises are used or occupied by two or more tenants of a common landlord, or form grounds appurtenant to a house occupied by two or more tenants of a common landlord, then the landlord. Each tenant, however, is responsible for that part of the premises which he occupies to the exclusion of the other tenants; provided, that in case the premises are occupied by a tenant under a yearly or monthly tenancy, or under a lease for not more than a year, or under any lease whereby the lessor is expressly or impliedly obligated to keep the premises in repair, and the collection of standing or flowing water in which mosquitoes breed or are likely to breed is owing to the disrepair of the buildings, or to any natural quality of the premises, or to any condition that existed at the time when the tenant entered into possession, or to anything done on the premises by the landlord during the existence of the tenancy or lease, then, and in that case, the landlord is the person responsible. Any person who has caused to exist on any premises of which he is not the owner, landlord, occupant, or tenant any collection of water in which mosquitoes breed or are likely to breed, is responsible, as well as the owner, landlord, tenant, or occupant, as the case may be.
('64 Code, § 15-8)