Pythium foliar blight

Pythium aphanidermatum

SymptomsPythium aphanidermatum is responsible for pre and post emergence damping off. Pre-emergence damping off is when the seed is infected prior to germination. This can result in poor or no germination, and is observable as a browning or rotting of the seed. Post emergence damping off takes place after germination and results in a thinning, water-soaked stem near the plant collar, which eventually causes the collapse of the plant. P. aphanidermatum can also cause root rot. Symptoms of root rot include stunted growth, chlorotic leaves, leaf drop, and wilting. The infection begins at the root tip, and can cause the infected region to lose its protective outer layer, exposing the inner root to other pathogens.

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