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1.6-2.3 mm.
Apterous: small, dark red to black.
Alate: dark red to black, glossy, antennae long and dark, cornicles short, slightly bulging and pigmented, wing veins completely pigmented.

Apparently anholocyclic: the biology of this species is still poorly known.

Liliaceae: Allium spp (onion, shallot, leek).

N. formosana strongly resembles Neotoxoptera oliveri.
The species N. oliveri, known from Portugal, has not yet been seen in France on cultivated Allium spp. On the other hand, some alate individuals were caught for the first time in 1988 at Montpellier and this is now more frequent.

Agronomic impact

N. formosana does not develop very abundant colonies on Allium, therefore it is not considered as a significant pest.
It develops either on leaves of the plant under cultivation or on stored bulbs.