Trifolium
Guides
Dasineura trifolii
clover leaf midge
Dasineura trifolii is a gall midge in the family Cecidomyiidae, commonly known as the clover leaf midge. The species induces gall formation on clover plants (Trifolium spp.), with larvae developing within the leaf tissue. Like other Dasineura species, it exhibits the typical cecidomyiid life cycle involving complete metamorphosis with distinct egg, larval, pupal, and adult stages. The specific gall morphology and precise host range within the genus Trifolium require further documentation.
Hylastinus
clover root borer (for H. obscurus)
A genus of crenulate bark beetles (Curculionidae: Scolytinae) comprising approximately 11 described species. The genus is best known through Hylastinus obscurus, the clover root borer, which has been extensively studied due to its status as a major agricultural pest of red clover (Trifolium pratense). Members develop in roots of leguminous plants, with larvae creating short galleries in root tissues. The genus has a Palearctic native distribution but H. obscurus has been introduced to North and South America where it causes significant crop damage.
Idaea tacturata
dot-lined wave moth
Idaea tacturata is a small geometrid moth occurring in the southeastern United States. The species was described by Francis Walker in 1861 and is active year-round in the southern portion of its range. Larvae feed on Trifolium species (clovers).
Porphyrosela minuta
A tiny leaf-mining moth in the family Gracillariidae, Porphyrosela minuta creates distinctive white blotch mines on clover leaves. Native to South America, it has established populations in North America following recent introduction. The species is multivoltine with rapid development, completing its life cycle in approximately 16 days at 25°C. Adults are minute and difficult to observe in the field.
Therioaphis trifolii
yellow clover aphid, spotted alfalfa aphid
Therioaphis trifolii is a phloem-feeding aphid and major agricultural pest of alfalfa (Medicago sativa) and clover species (Trifolium spp.). The species exhibits significant intraspecific variation, with distinct biotypes showing host-specific adaptations: the spotted alfalfa aphid (SAA) primarily colonizes Medicago species, while the spotted clover aphid (SCA) specializes on Trifolium. Native to the western Palaearctic, it has established globally including Australia, North America, and parts of Asia. The species manipulates host plant defense pathways through salivary secretions, activating salicylic acid signaling while suppressing jasmonic acid responses to improve host suitability.