Hi Grace!

Our hot and wet weather fostered ideal conditions for a fungus called Rhizoctonia to develop (often called Web Blight.)

The typical symptoms of this fungal disease are a rapid blighting or dieback of the foliage during hot humid conditions. The infected plants may turn dark brown or black and will often quickly collapse. 

We recommend thinning out the plant to increase air circulation - this will allow leaves to dry faster and will reduce the humidity level. Avoid overhead watering and remove fallen debris and clean up of old leaves etc.

Jamie