DISEASE IDENTIFICATION
                  

There are several excellent sites with good photo illustrations of plants diseases.
 

http://plant-disease.ippc.orst.edu/plant_index.cfm

This is a easy to use site with good photos for easy disease identification. To find what's attacking your plant, click the first letter of the common name of your plant, then click GO. From the drop-down list, select the common name of your plant with the list of the corresponding diseases. Under the disease description are the cause/causes of the problem, a description of the symptoms, cultural and biological control.

Very useful are the accompanying images of many of the listed diseases.

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If you do not find what you need, this site also has good images of diseases that I find very helpful in identification.

  http://plantdiagnostics.umd.edu/index.cfm

This is arranged according to plant type (tree, shrub, ornamentals, etc.)

Click on the part of the plant affected-flowers, leaves, roots/bulbs, stems or the whole plant. You will also find good images of the disease with symptoms, and how to manage and control the disease.

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This is another good site for disease identification.

http://www.ppath.cas.psu.edu/EXTENSION
      /PLANT_DISEASE/index.html

There are good descriptions of disease symptoms with the pathogen/cause of the disease; and recommendations for the management of the disease.
           
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