Annuals that turn grey and die ie Flanders Poppies

San Francisco, CA

My Flanders Poppies are turning grey on one side of the plant, and then it spreads and the plant dies. I tried to cut out the grey part, but that won't stop the grey from spreading.

Someone wrote about Marigolds turning grey and dying, and now this is happening I am wondering if we are suffering from the same thing?

I think it could be a ph problem, but that is my only idea.

The ones in the back of house are ok, it is only the ones in front. I have some Marigolds in front as well that are fine.
Bug Girl

Is it powdery?

San Francisco, CA

no, it not ready powdery, it just a grey color, but does not rub off like a mold type of thing.

San Francisco, CA

I looked again and it could be some type of mildew after all, because it has spread to another area with different soil, so I detroyed all the infected plants.

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