An epidemic kills all plant-life on Earth. What would happen to the fauna? Is there some realistic time-line when happens what?

I was wondering what would happen to life, when an infamous epidemic plague would be able to infect and kill any imaginable plant, be it on land or in the waters.

Would the lack of oxygen eventually kill Earth's fauna? Or would a gradually fading out food production be the bottleneck?

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An epidemic kills all plant-life on Earth. What would happen to the fauna? Is there some realistic time-line when happens what?

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