Philodendron Diseases

Disease	Symptoms	Pathogen/Cause	Management
Bacterial Leaf Spot	Translucent spots on leaf margins become reddish brown with yellow halos. Large spots are tan and irregularly shaped.	Xanthomonas campestris pv. dieffenbachiae	Purchase plants free from the disease. Avoid overhead watering. Remove infected leaves.
Bacterial Blight Philodendron selloum	Very dark-green to brown blotches form between leaf veins.	Temperatures below 50 degrees F	Do not place plants near air conditioners. Maintain temperatures above 55 degrees F.
Magnesium Deficiency	V-shaped yellow areas form on leaves especially in cool greenhouses.	Insufficient magnesium	Apply one teaspoon magnesium sulfate (Epsom salts) per gallon of water.
Tip Curl	Leaf tips curl downward and leaf margins brown. Roots die.	Overfertilization	Reduce fertilizer rate and leach the soil if slow-release fertilizer is not present. Repot if slow release is excessive.