Tomato leaf crud

Asked July 19, 2017, 2:06 PM EDT

What is this stuff? Thanks for your help.

Frederick County Maryland

1 Response

Purplish leaves in young tomatoes can be an indicator of phosphorus deficiency. Your plant might not be getting enough nutrition if it is in a pot that is too small. Is this a dwarf or patio type tomato? If it is a regular (full size) tomato, we recommend a 5 gallon pot for each tomato plant. If you have several plants crowded in a pot, there will be competition for root space, water, and nutrients. You could transplant to a different pot. Some potting soil mixes already contain a general fertilizer. If yours does not, you can add a general 10-10-10 fertilizer and see if the plant improves. Also, make sure the plant gets full sunlight and sufficient water during very hot, dry weather.

Here is a resource on some of the common problems that occur in tomatoes -- and the causes.
https://extension.umd.edu//sites/extension.umd.edu/files/_images/programs/hgic/Publications/HG56%20I...

For additional tips on growing tomatoes, see the following web page:
http://extension.umd.edu/growit/vegetable-profiles-tomatoes

ckc