tachinid fly ectophasia crassipennis or oblonga on symphyotrichum aster blossom

aster plant garden flower flora blooming closeup purple autumn summer nature blossom bloom season gardening floral botany symphyotrichum perennial ornamental herbaceous lilac bush october violet foliage colorful asteraceae insects animal biodiversity ecosystem phasia crassipennis ectophasia diptera oblonga tachinidae tachinid orange vrown fly wings parasitic female