Bedstraw

Foodplant / gall
Aceria galioba causes gall of leaf (terminal) of Galium

Foodplant / open feeder
adult of Cryptocephalus moraei grazes on live flower of Galium
Remarks: season: 5-9

Foodplant / gall
larva of Dasineura galiicola causes gall of leaf of Galium

Foodplant / sap sucker
Dysaphis pyri sucks sap of live Galium
Remarks: season: late spring-

Foodplant / gall
Eriophyes galii causes gall of leaf of Galium

Foodplant / gall
larva of Geocrypta galii causes gall of stem of Galium

In Great Britain and/or Ireland:
Foodplant / saprobe
effuse colony of Gyrothrix dematiaceous anamorph of Gyrothrix verticillata is saprobic on dead stem of Galium
Remarks: season: 9

Foodplant / feeds on
Halticus apterus feeds on Galium
Other: major host/prey

Foodplant / feeds on
Halticus luteicollis feeds on Galium

Foodplant / sap sucker
nymph of Legnotus limbosus sucks sap of Galium

Foodplant / miner
larva of Liriomyza morio mines leaf of Galium
Other: sole host/prey

Foodplant / sap sucker
Myzus cerasi sucks sap of live, distorted leaf of Galium
Remarks: season: summer
Other: major host/prey

Foodplant / parasite
underground tuber of Orobanche caryophyllacea parasitises root of Galium

Foodplant / feeds on
Orthocephalus coriaceus feeds on Galium

Foodplant / parasite
grouped pycnidium of Placosphaeria coelomycetous anamorph of Placosphaeria punctiformis parasitises stem of Galium
Remarks: season: 7-10
Other: uncertain

Foodplant / parasite
plurilocular, amphigenous stroma of Placosphaeria coelomycetous anamorph of Placosphaeria stellatarum parasitises fading leaf of Galium

Plant / resting place / on
male apter of Platythrips tunicatus may be found on Galium
Remarks: season: 5-10

Foodplant / gall
telium of Puccinia galii-verni causes gall of live stem of Galium

Foodplant / saprobe
gregarious to scattered, erumpent apothecium of Pyrenopeziza galii is saprobic on dead stem of Galium

Foodplant / open feeder
larva of Sermylassa halensis grazes on leaf of Galium

Foodplant / open feeder
adult of Timarcha goettingenis grazes on leaf of Galium
Remarks: season: late 2-12

Foodplant / open feeder
adult of Timarcha tenebricosa grazes on leaf of Galium
Remarks: season: 1-12

Foodplant / gall
Trioza velutina causes gall of leaves (terminal) of Galium

Annual or perennial herbs, erect, creeping or climbing. Stems often 4-angled, sometimes prickly. Stipules similar to the leaves. Leaves (and leaf-like stipules) in whorls of 4-10, ± sessile. Flowers in axillary or terminal cymes, bisexual, rarely unisexual, usually 4-merous, not enclosed in an involucre. Calyx reduced to a rim; teeth 0. Corolla rotate to ± campanulate, greenish, creamy-white to bright yellow. Ovary 2-locular with 1 ovule per loculus. Fruit dry, glabrous or variously hairy, consisting of two 1-seeded mericarps.

Galium is a large genus of annual and perennial herbaceous plants in the family Rubiaceae, occurring in the temperate zones of both the Northern and Southern Hemispheres. Some species are informally known as bedstraw.

There are over 600 species of Galium, with estimates of 629 to 650 as of 2013. The field madder, Sherardia arvensis, is a close relative and may be confused with a tiny bedstraw. Asperula is also a closely related genus; some species of Galium (such as woodruff, G. odoratum) are occasionally placed therein.