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===Pests and diseases===
===Pests and diseases===
The two main diseases which infect asters are ''rust'' and ''powdery mildew'', both of which can be avoided by:
*making sure plants are well-spaced to allow for good air circulation; and
*watering plants at the roots so as to avoid the foliage becoming excessively wet.
''Rust'' can be easily identified by the orange pustules which form on the underside of the leaves.
''Powdery Mildew'' appears like a white sooty residue on the upper-side of the leaves, quickly causing defoliation.
==Species==
==Species==
