Disease? Please help! Pics provided

Garden · July 20, 2011

My tomatoes were wiped out last year from whatever this is. Any ideas\suggestions? Thanks.

tam91 · July 20, 2011

Early Blight or Septoria Leaf Spot (I have a hard time telling the difference, someone else will know I'm sure). But a fungal disease in either case.

But either way, pull off the affected leaves and spray with Daconil (Chlorothalonil) on a regular basis (once a week, and after rain). That usually controls the disease.

bcday · July 20, 2011

A bad case of Septoria, one of the foliar fungal diseases.

There are several recent threads here in the Diseases and Pests section discussing options for prevention and treatment. You can find them using the Search link near the top of the page.

Basically treatment involves removing diseased foliage as soon as you see it and if you wish, spraying a preventative antifungal to keep spores from infecting healthy leaves. Chlorothalonil, the active ingredient in Ortho Garden Disease Control and Bonide Fung-onil, works well for me. Other folks have success with various other remedies. Chlorothalonil is a preventative only, it will not kill Septoria that is already growing on a leaf.

Dispose of diseased foliage in a sealed plastic bag in the trash, not in your compost pile. Septoria can overwinter on diseased plant debris and reinfect your new young plants next year.

Garden · July 21, 2011

Thanks guys. I was never too sure what it was. It was especially devastating since Toms are my favorite thing to grow.

July 20, 2011	#2
tam91 Tomatovillian™ Join Date: Aug 2010 Location: Crystal Lake IL Posts: 2,484	Early Blight or Septoria Leaf Spot (I have a hard time telling the difference, someone else will know I'm sure). But a fungal disease in either case. But either way, pull off the affected leaves and spray with Daconil (Chlorothalonil) on a regular basis (once a week, and after rain). That usually controls the disease. __________________ Tracy

July 20, 2011	#3
bcday Tomatovillian™ Join Date: Jan 2006 Location: NY z5 Posts: 1,205	A bad case of Septoria, one of the foliar fungal diseases. There are several recent threads here in the Diseases and Pests section discussing options for prevention and treatment. You can find them using the Search link near the top of the page. Basically treatment involves removing diseased foliage as soon as you see it and if you wish, spraying a preventative antifungal to keep spores from infecting healthy leaves. Chlorothalonil, the active ingredient in Ortho Garden Disease Control and Bonide Fung-onil, works well for me. Other folks have success with various other remedies. Chlorothalonil is a preventative only, it will not kill Septoria that is already growing on a leaf. Dispose of diseased foliage in a sealed plastic bag in the trash, not in your compost pile. Septoria can overwinter on diseased plant debris and reinfect your new young plants next year.

July 21, 2011	#4
Garden Tomatovillian™ Join Date: Jul 2011 Location: IN Posts: 2	Thanks guys. I was never too sure what it was. It was especially devastating since Toms are my favorite thing to grow.