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