Dendrobium, Cattleya and Phalaenopsis are all showing signs of disease

[Bethy]

These orchids are about 15 years old and have grown beautifully in the past. Now the Cattleya and Phalaenopsis look like they have a bacterial infection and have been treated with copper fungicide. Do you have a different opinion? I am especially concerned about the Cattleya.

The Dendrobium canes just look strange. What do you think is going on? I appreciate your insights.

[estación seca]

Have a look at the diseases section of the St Augustine Orchid Society Web page. Your plants might have anthracnose disease. Has it been especially warm and humid?

[Bethy]

Thank you for your reply. The orchids are grown indoors, as the outdoor temperature exceeds 100°F in an arid desert climate. Thank you, I'll look into St. Augustine's page.