Yarrow, Milfoil

Plant / associate
adult of Bruchidius villosus is associated with flower of Achillea millefolium

In Great Britain and/or Ireland:
Foodplant / open feeder
nocturnal adult of Chrysolina marginata grazes on live leaf of Achillea millefolium
Remarks: season: early 8-mid 11,4-

Foodplant / open feeder
adult of Chrysolina staphylaea grazes on live leaf of Achillea millefolium
Remarks: season: early 7-late 10,4-

Foodplant / saprobe
scattered, covered, dark brown pycnidium of Diplodina coelomycetous anamorph of Diplodina millefolii is saprobic on dead stem of Achillea millefolium
Remarks: season: 3

Foodplant / gall
larva of Dithryca guttularis causes gall of stem (base) of Achillea millefolium
Other: sole host/prey

Foodplant / parasite
sorus of Entyloma achilleae parasitises live leaf of Achillea millefolium
Remarks: season: 8

Foodplant / parasite
Golovinomyces cichoracearum parasitises live Achillea millefolium

Plant / resting place / within
larva of Haplothrips propinquus may be found in live flower of Achillea millefolium
Remarks: season: 1,3,7-9

Animal / pathogen
Rhizoctonia anamorph of Helicobasidium purpureum infects root of Achillea millefolium

Foodplant / miner
larva of Liriomyza flavopicta mines stem (upper) of Achillea millefolium
Other: sole host/prey

Foodplant / miner
larva of Liriomyza hampsteadensis mines Achillea millefolium
Remarks: Other: uncertain

Foodplant / miner
larva of Liriomyza ptarmicae mines leaf of Achillea millefolium

Foodplant / sap sucker
adult of Megalocoleus molliculus sucks sap of Achillea millefolium
Remarks: season: early 7-9

Plant / resting place / within
puparium of Melanagromyza dettmeri may be found in stem of Achillea millefolium

Foodplant / feeds on
Microplontus triangulum feeds on Achillea millefolium

Foodplant / feeds on
larva of Olibrus millefolii feeds on Achillea millefolium

Foodplant / parasite
underground tuber of Orobanche purpurea parasitises root of Achillea millefolium
Other: major host/prey

Foodplant / feeds on
Orthocephalus coriaceus feeds on Achillea millefolium

Foodplant / gall
larva of Oxyna flavipennis causes gall of root of Achillea millefolium

Foodplant / saprobe
loosely gregarious, sometimes linearly arranged, covered then projecting pycnidium of Phomopsis coelomycetous anamorph of Phomopsis achilleae var. achilleae is saprobic on dead stem of Achillea millefolium
Remarks: season: 8-11

Foodplant / miner
larva of Phytomyza pullula mines leaf of Achillea millefolium

Foodplant / sap sucker
adult of Plagiognathus chrysanthemi sucks sap of Achillea millefolium
Remarks: season: late 6-9(10)

Foodplant / parasite
amphigenous telium of Puccinia cnici-oleracei parasitises live leaf of Achillea millefolium
Remarks: season: 7-11
Other: minor host/prey

Foodplant / saprobe
numerous, crowded, sometimes confluent, seriate, glabrous, black, covered then erumpent pycnidium of Septoria coelomycetous anamorph of Septoria millefolii is saprobic on dead stem of Achillea millefolium
Remarks: season: 4

Foodplant / feeds on
larva of Trichosirocalus barnevillei feeds on Achillea millefolium

Foodplant / internal feeder
larva of Trupanea amoena feeds within capitulum of Achillea millefolium
Remarks: Other: uncertain