PM is NOT systemic and doesn't need any special chemical to kill it. PM is a fungus that lives on top of the leaves and spread via spores. Fungi is not systemic, but a host !
The first part is right. PMs are not systemic. But let's get the terms right-
1)some fungi are systemic and actually grow inside the plant/animal/other fungus
2)the host is the "victim", in any parasite/host relationship, or the partner in a symbiotic relationship.
edit: 3) some "normally" non-systemic fungi can become a systemic infection when they meet the wrong host, or when natural defenses are down. Candida (Thrush), a yeast that causes infection in humans, can become systemic thrush in immunocompromised individuals, for instance HIV patients with full blown AIDS.
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