Tomato leaves turning purple?

Redmond, WA

Something is affecting my tomato plants. The outer edges of the leaves are turning purple, then drying out and dying.

Thumbnail by acappella
Redmond, WA

The undersides of the leaves look OK except for the veins turning purple in the same area that the top of the leaf is turning purple.

I'm afraid it's a virus, since it's only affecting one set of plants, and not another set that's on the other side of the house.

Any thoughts?

Thumbnail by acappella
Bella Vista, AR(Zone 6b)

This is happening to the leaves on marigolds and gerbera daisies at my friend's house. I think I read somewhere that it could be a sign of a mineral deficiency. I would like to know the answer as well.

Garland, TX(Zone 8a)

Purple coloration in tomato plants is often associated with a lack of phosphorus. Climatic conditions may be a factor as well (e.g. excessive moisture, cool weather).

Tucson, AZ(Zone 8b)

I just noticed this on my corn this morning. Just the outer edges on some of the new growth. Do you think it could be the same thing?

Pittsburgh, PA

Need help with tomato plants it's like there rotting but there still green maybe some type of fungus herd about it on the news but not sure.

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