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Old August 1, 2013   #3
RayR
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Join Date: Jun 2010
Location: Cheektowaga, NY
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Phosphorus deficiency shows first as purpling on the bottom of the leaf surface, where Tomato Purple Leaf Disorder shows on the top of the leaf surface.
Have the plant pathologists ever figured out what the cause of TPLD is? The last I heard they suspected it was cause by a virus since no other pathogen was discovered.
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