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1.0-2.1 mm.
Apterous: light brownish yellow or matt green, with tranverse spots arranged in pairs on  abdomen.
Alate: green with black dorsal patch; antennae dark, same length as body, cornicles straight and moderately pigmented, cauda medium length and triangular.

See identification file

Anholocyclic

Numerous families including: Liliaceae, Asteraceae, Brassicaceae, Apiaceae, Solanaceae, also flowering plants.

M. ornatus causes direct damage related to sap extraction but this is insignificant owing to the low densities of colonies formed. However, the abundant honeydew can be a factor for preventing release of certain ornamental plants on the market.
M. ornatus transmits more than 20 or so viruses that depend on the persistent modes like the pea enation mosaic virus (PEMV), the beet western yellow virus (BWYV) and non-persistent viruses on onion, bean or tomato for example.