Plant Nutrient Deficiency Symptoms, Insects, and Diseases. Here is an extensive list with pictures to help you find any issue that you might have. >>> http://people.umass.edu/~psoil120/manual/lab7.html
Tomato Disease Identification Key by Affected Plant Part: Leaf Symptoms >>> http://vegetablemdonline.ppath.cornell.edu/DiagnosticKeys/TomLeaf/TomLeafKey.html
Diseases and Disorders of Vegetables Image Gallery >>> http://www.hort.purdue.edu/rhodcv/hort410/ho09000.htm
A Guide to the Identification of Common Problems >>> http://aggie-horticulture.tamu.edu/vegetable/tomato-problem-solver/
Tomato Disease Identification Key by Affected Plant Part: Leaf Symptoms >>> http://vegetablemdonline.ppath.cornell.edu/DiagnosticKeys/TomLeaf/TomLeafKey.html
Diseases and Disorders of Vegetables Image Gallery >>> http://www.hort.purdue.edu/rhodcv/hort410/ho09000.htm
A Guide to the Identification of Common Problems >>> http://aggie-horticulture.tamu.edu/vegetable/tomato-problem-solver/