tiny little black spots on cattleya new leaf growth

[jean2]

In cattleyas, the infection usually affects older leaves. It appears as sunken black spots that are clearly delimited. It advances slowly and is
rarely fatal.

The tiny spots may start on either leaf surface as sunken, yellow lesions. They continue to enlarge, becoming dark brown to black, circular or irregular lesions. Spots may merge to form large, irregular patches on the leaf. Heavily infected leaves fall prematurely.

Remove infected leaves with a sterile instrument and reduce leaf wetness. Spray with a systemic fungicide such as thiophanate methyl (Cleary's 3336 or Banrot) or a protectant fungicide like Mancozeb, following label instructions. Alternate systemic and protectant fungicides.

Good sanitation with good air movement. Reduce leaf wetness, water on the leaves may lead to infection. If the fungus is a continuing problem, monthly fungicide sprays may offer effective prevention.