Norfolk Island Pine Diseases and in the Greenhouse

Disease	Symptoms	Pathogen/Cause	Management
Anthracnose	Small dead areas form on needles and the entire needle dies. Small black fungal fruiting bodies are seen in the dead tissue. Large portions of branches brown and needles fall.	Colletotrichum derridis	Avoid overhead watering. Keeping the surface of the foliage dry will prevent this disease. Apply mancozeb.
Branch Droop	Excessive drooping of branches although trunk is straight. Plants develop poorly.	Low light intensity	Provide at least 6,000 cu ft of light to plants more than 6 inches tall.
Root Rot	Plants grow slowly and wilt. Roots are small, brown to black, and are soft and rotting.	Cylindrocladium or Pythium	Pot in pasteurize mix. Maintain even soil moisture. Etridiazole soil drench will protect against Pythium.
Yellowing	Branch tips and the main growing tip are yellow rather than dark green.	Micronutrient deficiency	Apply a micronutrient solution.

COMMON NAME	TRADE NAME
etridiazole	Truban
mancozeb	Protect T/O