| [[Image:betterhomesgardens-911143336-1169439432.jpg|Rusts]] |
Rusts are recognised as small yellow or orange patches or spots, which appear mainly on the upper surfaces of leaves. Old-fashioned Hollyhocks are particularly susceptible to rust.
On the underside, powdery, raised pustules appear under each spot. This disease can cause leaf fall and seriously weaken plants.
Most rusts attack a specific plant or a small group of related plants and will not transfer from one host to another, but there are varieties for a broad range of plants.
Control:
As a preventative measure it is best to grow rust-resistant varieties of plants whenever possible. As different rusts affect a great many plants, treatment often differs.
Spraying with an approved chemical is effective against most rust fungi. Clear away fallen leaves to prevent a carry-over of the disease.
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