Insects Feeding
on these Plants

Juncus spp.
(Rushes) [Juncaceae]
(Observations are from Vaurie, Marshall, Clark et al., Hoffman, Covell, Smith, Felt, Blackman & Eastop, Harms & Grodowitz, Miller, Spencer & Steyskal, ScaleNet)

Coleoptera (Beetles)
Chrysomelidae: Plateumaris pusilla Clk2004; Curculionidae: Sphenophorus callosus (Southern Corn Billbug) Vau1983

Diptera (Flies)
Agromyzidae: Cerodontha capitata [larvae are stem-borers; widespread] SS1986, Cerodontha longipennis [larvae are stem-borers; widespread] SS1986, Cerodontha luctuosa [larvae are leaf-miners; found in New York & Canada] SS1986 

Heteroptera (True Bugs)
Lygaeidae: Cymodema breviceps [eats seeds, preferred host plants] Hof1996, Cymus angustatus [eats seeds, preferred host plants] Hof1996

Homoptera (Sucking Insects)
Aphididae: Prociphilus corrugatans [causes cupping & curling of leaves on hawthorns, migrating during the summer to the roots of rushes & sedges; this aphid is found in NE & north-central USA, including Illinois] BE2013, Rhopalosiphum nymphaeae (Waterlily Aphid) [found on young shoots, petioles, & fruit stalks of cherry & plum trees, migrating during the summer to a wide variety of emergent aquatic & floating aquatic plants] BE2013, Sipha glyceriae [this Eurasia aphid has been found in Maine & Canada] BE2013; Pseudococcidae:
Trionymus caricis (Carex Mealybug) [found underneath leaf sheaths; this insect occurs in Maryland, Massachusetts, Tennessee, & elsewhere in the USA] SN2014; Psyllidae: Livia maculipennis (Rush Psyllid) [deforms inflorescence, transforming floral organs into a cluster of linear bracts] Flt1917

Hymenoptera (Bees, Wasps, & Sawflies)
Tenthredinidae: Eutomostethus luteiventris [larvae feed on foliage, introduced into North America from abroad] Msh2006 Sm2006

Lepidoptera (Butterflies, Skippers, & Moths)
Crambidae: Chilo forbesellus [found in Michigan & Minnesota] HG2009; Noctuidae: Archanara subflava (Yellow Sedge Borer) [syn. Capsula subflava, larvae bore through stems; this insect is found in Illinois, Wisconsin, Ohio, Maine, & Ontario] Cv2005 HG2009
; Tortricidae: Bactra verutana (Javelin Moth) Mlr1987