What is the most economical barrier that can physically prevent any spaceships from trespassing into Earth?

In the 22nd century C.E. human already colonised the entire Solar system, and Earth becomes a dangerous place to live because of the spread of deadly synthetic virus that kills every animals and screws even electronic circuitry by emitting EMP.

Right now Earth is being quarantined and I need a kind of reliable and cost effective barrier to block spacecraft from entering or exiting the Earth's atmosphere. How do I erect such a physical barrier to imprison the left for dead planet?

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What is the most economical barrier that can physically prevent any spaceships from trespassing into Earth?

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