Anthracnose attacks the stems and invades the roots.
Seedlings are most susceptible and high temperatures and humidity favor disease development.
The leaf spotting is most common on greenhouse grown seedlings. Rust infects leaves, stems, bracts and other green plant parts. Brown pinhead size spots develop on the undersides of leaves. On the upper leaf surface the spots are larger, bright yellow or orange with reddish centers. The spots run together causing death of large leaf areas.