Fungus gnats

Identification

narrow, black fly with large wings (2.5 mm long)
long antennae
larvae are almost transparent with a black head (6 mm long)
Y-shaped venation on transparent wings

Damage
larvae feed on the young roots causing plant stunting and wilt
larvae can spread mites, nematodes, and fungi
adults can encourage pathogens such as; Pythium, Botrytis, Fusarium, Verticillium

Beneficial insects for control

Strateolaelaps scimitis (Acari: Laelapidae)
-generalist predatory mite

Atheta (Dalotia) coriaria (Coleoptera: Staphylinidae)
-generalist predatory beetle

Gaeolaelaps  gillespiei (Acari: Laelapidae)
-predatory mite