StreedGardens
Newly Registered
Posts: 6
Joined: Sun Jul 10, 2011 7:31 pm

Aster "brown out"

Many of my asters, notably the Purple Dome variety, brown out from the base up, and often destroys the flowers before they bloom. I have noticed this to a lesser degree in native wild asters and some of the cultivars, but not to this degree. Looks like a fungus or blight. Anyone have any ideas?

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shadylane
Green Thumb
Posts: 456
Joined: Tue Jun 21, 2011 3:42 pm
Location: North Central Illinois

Most likely Black Root Rot, a soil fungi that attacks plant roots. The base of the stems turn brown/black and the leaves become discolored. This usually occurs when same crops are repeatedly grown in the same spot.

It can also be from plants not having regular waterings.

The fungi can be controled, if they are not affected severely. Cut back diseased tissue damaged shoots to healthy plant life. Plant in another location or build up soil with healthy material. Some plants may have to be destroyed if badly affected.

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