Foodplant / open feeder
larva of Amauronematus histrio grazes on leaf of Salix fragilis
Other: major host/prey

Foodplant / open feeder
larva of Amauronematus taeniatus grazes on leaf of Salix fragilis
Other: major host/prey

Foodplant / parasite
immersed pycnidium of Camarosprium coelomycetous anamorph of Camarosporium salicinum parasitises twig of Salix fragilis
Remarks: season: 5-6

Foodplant / sap sucker
Cavariella aegopodii sucks sap of live Salix fragilis
Remarks: season: autumn-spring

In Great Britain and/or Ireland:
Foodplant / saprobe
fruitbody of Coronicium alboglaucum is saprobic on dead wood of Salix fragilis

Foodplant / open feeder
adult of Cryptocephalus sexpunctatus grazes on pollen of Salix fragilis
Remarks: season: 5-7
Other: uncertain

Foodplant / saprobe
Diplodina coelomycetous anamorph of Cryptodiaporthe salicella is saprobic on dead twig of Salix fragilis
Remarks: season: 1-2

Foodplant / false gall
stroma of Cryptomyces maximus causes swelling of live, girdled branch (thin) of Salix fragilis

Foodplant / saprobe
often astromatic, prominent, loculi in a circle pycnidium of Cytospora coelomycetous anamorph of Cytospora fugax is saprobic on bark of Salix fragilis

Foodplant / saprobe
loosely gregarious, erumpent stroma of Cytospora coelomycetous anamorph of Cytospora salicis is saprobic on dead, often attached twig of Salix fragilis
Remarks: season: 1-8

Foodplant / saprobe
scattered, radially plurilocular or subplurilocular stroma of Cytospora coelomycetous anamorph of Cytospora translucens is saprobic on twig of Salix fragilis
Remarks: season: Spring

Plant / epiphyte
Diderma chondrioderma grows on live bark of Salix fragilis

Foodplant / feeds on
Dorytomus hirtipennis feeds on Salix fragilis

Foodplant / parasite
acervulus of Monostichella coelomycetous anamorph of Drepanopeziza salicis parasitises live leaf of Salix fragilis
Remarks: season: 8-9

Plant / epiphyte
Echinostelium corynophorum grows on live bark of Salix fragilis

Plant / epiphyte
Echinostelium fragile grows on live bark of Salix fragilis

Plant / associate
Euphranta toxoneura is associated with Salix fragilis

Foodplant / gall
larva of Euura mucronata causes gall of live bud and bud-peduncle of Salix fragilis

Foodplant / gall
larva of Euura testaceipes causes gall of leaf (midrib) of Salix fragilis
Other: major host/prey

Foodplant / parasite
fruitbody of Ganoderma resinaceum parasitises live trunk of Salix fragilis
Other: minor host/prey

Foodplant / pathogen
erumpent perithecium of Glomerella cingulata infects and damages live shoot of Salix fragilis
Remarks: season: 5+

Foodplant / saprobe
numerous, clustered, stromatic apothecium of Godronia fuliginosa is saprobic on dead branch of Salix fragilis
Remarks: season: 7-8

Foodplant / saprobe
fruitbody of Hypochnicium polonense is saprobic on often sodden, dead, fallen, decayed wood of Salix fragilis

Foodplant / saprobe
stroma of Hypoxylon subticinense is saprobic on dead bark of Salix fragilis
Remarks: season: 2-3

Foodplant / saprobe
clustered fruitbody of Lentinus tigrinus is saprobic on dead, partly submerged wood of Salix fragilis
Other: major host/prey

Plant / epiphyte
Licea belmontiana grows on live bark of Salix fragilis

Plant / epiphyte
Licea denudescens grows on live bark of Salix fragilis

Plant / epiphyte
Licea inconspicua grows on live bark of Salix fragilis

Plant / epiphyte
Licea marginata grows on live bark of Salix fragilis

Plant / epiphyte
Licea parasitica grows on live bark of Salix fragilis

Foodplant / parasite
mostly epiphyllous telium of Melampsora allii-fragilis parasitises live leaf of Salix fragilis

Foodplant / parasite
mostly hypophyllous, subepidermal telium of Melampsora epitea parasitises live leaf of Salix fragilis

Foodplant / open feeder
larva of Nematus salicis grazes on leaf of Salix fragilis
Other: major host/prey

Foodplant / saprobe
fruitbody of Oxyporus latemarginatus is saprobic on dead, fallen usually decayed, white rotten trunk (large) of Salix fragilis

Plant / epiphyte
Paradiacheopsis fimbriata grows on live bark of Salix fragilis

Foodplant / roller
larva of Phyllocolpa puella rolls leaf edge of Salix fragilis

Foodplant / saprobe
becoming superficial, scattered pycnidium of Pleurophoma coelomycetous anamorph of Pleurophoma pleurospora is saprobic on dead twig of Salix fragilis
Remarks: season: 3,11

Foodplant / gall
larva of Pontania proxima causes gall of live leaf of Salix fragilis

Foodplant / gall
larva of Pontania viminalis causes gall of leaf (midrib underside) of Salix fragilis
Other: minor host/prey

Foodplant / open feeder
larva of Pristiphora confusa grazes on leaf of Salix fragilis
Other: major host/prey

Foodplant / saprobe
fruitbody of Schizophyllum amplum is saprobic on dying branch of Salix fragilis
Other: unusual host/prey

Foodplant / saprobe
fruitbody of Spongipellis spumeus is saprobic on wood of Salix fragilis
Other: unusual host/prey

Foodplant / saprobe
fruitbody of Terana caerulea is saprobic on dead, decayed wood of Salix fragilis
Other: minor host/prey

Foodplant / parasite
Uncinula adunca var. adunca parasitises Salix fragilis

Foodplant / pathogen
Fusicladium coelomycetous anamorph of Venturia chlorospora infects and damages live, lesioned shoot (young) of Salix fragilis
Other: major host/prey

Foodplant / hemiparasite
haustorium of Viscum album is hemiparasitic on branch of Salix fragilis