Allysum Problems
Symptom	Probable Cause
White downy growth especially underside leaf; leaves yellow, plant dies	Downy Mildew, A Fungal Disease
White powder coats top of leaves	Powdery Mildew, A Fungal Disease
Leaves yellow, wilt, die	Root Rot, replace plant
Dark lesions on stems; roots rot	Stem Rot, replace plant
Plant actually disappears	Deer