Hawthorn

Foodplant / open feeder
caterpillar of Abraxas grossulariata grazes on live leaf of Crataegus
Remarks: season: 4-6
Other: minor host/prey

In Great Britain and/or Ireland:
Foodplant / internal feeder
Acalles misellus feeds within small dead branch? of Crataegus

Foodplant / sap sucker
nymph of Acanthosoma haemorrhoidale sucks sap of haw of Crataegus
Remarks: season: early 6-late 9
Other: major host/prey

Foodplant / saprobe
colony of Acrodontium dematiaceous anamorph of Acrodontium hydnicola is saprobic on dead Crataegus

Foodplant / open feeder
caterpillar of Acronicta psi grazes on live leaf of Crataegus

Plant / associate
fruitbody of Agaricus lutosus is associated with Crataegus
Other: minor host/prey

Plant / associate
fruitbody of Agaricus subfloccosus is associated with Crataegus
Other: minor host/prey

Foodplant / internal feeder
larva of Agrilus sinuatus feeds within wood of mature tree of Crataegus

Foodplant / gall
Agrobacterium tumefaciens causes gall of stem (esp. base) of Crataegus

Foodplant / visitor
imago of Anaglyptus mysticus visits for nectar and/or pollen flower of Crataegus
Remarks: season: 4-

Foodplant / visitor
imago of Anoplodera sexguttata visits for nectar and/or pollen flower of Crataegus
Remarks: season: 5-7

Plant / associate
imago of Anthaxia nitidula is associated with Crataegus

Plant / associate
Anthonomus bituberculatus is associated with Crataegus

Plant / associate
Anthonomus chevrolati is associated with Crataegus

Plant / associate
Anthonomus pedicularius is associated with Crataegus

Plant / associate
Anthribus fasciatus is associated with Crataegus

Plant / associate
Anthribus nebulosus is associated with Crataegus
Remarks: Other: uncertain

Foodplant / open feeder
larva of Arge ustulata grazes on leaf of Crataegus

Foodplant / saprobe
apothecium of Bisporella sulfurina is saprobic on fallen branch of Crataegus
Remarks: season: 9-2

Foodplant / saprobe
fruitbody of Botryobasidium pruinatum is saprobic on decayed wood of Crataegus
Other: major host/prey

Foodplant / false gall
stromatic pseudothecium of Botryosphaeria obtusa causes swelling of branch of Crataegus

Foodplant / saprobe
fruitbody of Byssomerulius corium is saprobic on fallen, decayed wood of Crataegus
Other: minor host/prey

Foodplant / feeds on
adult of Byturus tomentosus feeds on live pollen of Crataegus
Remarks: season: 4-5

Foodplant / open feeder
epiphyllous larva of Caliroa cerasi grazes on leaf of Crataegus
Remarks: season: 6-9

Foodplant / saprobe
Camarosporium coelomycetous anamorph of Camarosporium crataegi is saprobic on dead wood of Crataegus

Plant / associate
basidiome of Cantharellus melanoxeros is associated with Crataegus
Other: minor host/prey

Foodplant / spot causer
Cercospora dematiaceous anamorph of Cercospora crataegi causes spots on live leaf of Crataegus

Foodplant / saprobe
basidiome of Ceriporia purpurea is saprobic on large, decayed, fallen trunk of Crataegus
Other: minor host/prey

Foodplant / saprobe
basidiome of Ceriporia viridans is saprobic on decayed wood of Crataegus
Other: minor host/prey

Foodplant / saprobe
perithecium of Chaetosphaeria myriocarpa is saprobic on fallen, dead branch of Crataegus
Remarks: season: 1-12

Foodplant / pathogen
basidiome of Chondrostereum purpureum infects and damages trunk of Crataegus

Plant / associate
fruitbody of Coprinus poliomallus is associated with Crataegus

Foodplant / saprobe
loose, cotton colony of Costantinella anamorph of Costantinella micheneri is saprobic on fallen twig of Crataegus

Plant / resting place / on
adult of Cryptocephalus pusillus may be found on Crataegus
Remarks: season: 5-10

Plant / resting place / on
adult of Cryptocephalus querceti may be found on Crataegus
Remarks: season: 5-8

Plant / resting place / on
adult of Cryptocephalus sexpunctatus may be found on Crataegus
Remarks: season: 5-7

Foodplant / saprobe
Cylindrodendrum anamorph of Cylindrodendrum album is saprobic on dead Crataegus

Foodplant / gall
larva of Dasineura crataegi causes gall of live shoot tip of Crataegus

Foodplant / saprobe
immersed, stromatial perithecium of Diaporthe crataegi is saprobic on dead twig of Crataegus
Remarks: season: 12-3

Foodplant / saprobe
immersed perithecium of Diaporthe rudis is saprobic on wood of Crataegus

Foodplant / saprobe
stromatic, immersed perithecium of Diatrype stigma is saprobic on dead, decorticate or with bark rolling back branch of Crataegus
Remarks: season: 1-12

Foodplant / saprobe
immersed, clustered, stromatic perithecium of Diatrypella favacea is saprobic on dead branch of Crataegus
Remarks: season: 11-3
Other: minor host/prey

Foodplant / open feeder
flattened larva of Dineura stilata grazes on leaf (upperside) of Crataegus
Other: sole host/prey

Foodplant / spot causer
epiphyllous, subcuticular acervulus of Entomosporium coelomycetous anamorph of Diplocarpon mespili causes spots on live leaf of Crataegus

Plant / associate
fruitbody of Entoloma niphoides is associated with Crataegus
Remarks: season: usually spring
Other: major host/prey

Foodplant / gall
Eriophyes goniothorax causes gall of live leaf of Crataegus

Foodplant / gall
Eriophyes goniothorax typicus causes gall of live leaf of Crataegus

Foodplant / gall
Eriophyes pyri crataegi causes gall of live leaf of Crataegus

Foodplant / pathogen
Erwinia amylovora infects and damages flower of Crataegus

Foodplant / open feeder
colonial, tented caterpillar of Euproctis chrysorrhoea grazes on live leaf of Crataegus
Remarks: season: 8-7

Foodplant / open feeder
caterpillar of Euproctis similis grazes on live leaf of Crataegus

Foodplant / saprobe
stromatic, immersed perithecium of Eutypa flavovirens is saprobic on dead wood of Crataegus
Remarks: season: 1-12

Foodplant / saprobe
stromatic, immersed perithecium of Eutypa lata is saprobic on dead twig of Crataegus

Foodplant / saprobe
immersed, stromatic perithecium of Eutypella scoparia is saprobic on dead branch of Crataegus
Remarks: season: 1-4

Plant / associate
fruitbody of Geastrum coronatum is associated with Crataegus

Plant / associate
fruitbody of Geastrum fimbriatum is associated with Crataegus

Plant / associate
fruitbody of Geastrum pectinatum is associated with Crataegus

Plant / associate
fruitbody of Geastrum quadrifidum is associated with Crataegus
Other: minor host/prey

Plant / associate
fruitbody of Geastrum striatum is associated with Crataegus

Foodplant / saprobe
immersed or erumpent perithecium of Gnomonia alni-viridis is saprobic on leaf-litter of Crataegus
Remarks: season: 1-6

Foodplant / visitor
imago of Grammoptera abdominalis visits for nectar and/or pollen flower of Crataegus
Remarks: season: end 4-8
Other: major host/prey

Foodplant / visitor
Grammoptera ruficornis visits for nectar and/or pollen flower of Crataegus
Remarks: season: 4-7
Other: major host/prey

Foodplant / parasite
epiphyllous pycnium of Gymnosporangium asiaticum parasitises live leaf of Crataegus
Remarks: Other: uncertain

Plant / associate
Hadrobregmus denticollis is associated with Crataegus

Foodplant / saprobe
Helicogloea lagerheimii is saprobic on dead, fallen, decayed wood of Crataegus
Other: minor host/prey

Foodplant / saprobe
effuse colony of Helminthosporium dematiaceous anamorph of Helminthosporium velutinum is saprobic on fallen, dead branch of Crataegus

Foodplant / pathogen
mycelium of Heterobasidion annosum infects and damages fresh stump of Crataegus
Other: unusual host/prey

Plant / resting place / within
ovum of Hoplocampa crataegi may be found in ovary of Crataegus
Other: sole host/prey

Plant / resting place / within
ovum of Hoplocampa pectoralis may be found in ovary of Crataegus
Other: sole host/prey

Foodplant / saprobe
gregarious apothecium of Hyaloscypha hyalina is saprobic on dead branch of Crataegus
Remarks: season: 1-12
Other: minor host/prey

Foodplant / saprobe
fruitbody of Hymenochaete cinnamomea is saprobic on dead, attached bark of Crataegus

Foodplant / saprobe
fruitbody of Hymenochaete rubiginosa is saprobic on dead wood of Crataegus
Remarks: Other: uncertain

Foodplant / saprobe
stalked apothecium of Hymenoscyphus imberbis is saprobic on dead, fallen twig of Crataegus
Remarks: season: 8-12

Foodplant / saprobe
fruitbody of Hyphodontia crustosa is saprobic on dead, decayed wood of Crataegus

Foodplant / saprobe
Geniculosporium anamorph of Hypoxylon howeanum is saprobic on dead branch of Crataegus
Remarks: season: 1-4
Other: minor host/prey

Foodplant / saprobe
effuse stroma of Hypoxylon multiforme is saprobic on dead, decorticate branch of Crataegus
Remarks: season: 10-4
Other: minor host/prey

Foodplant / saprobe
hysterothecium of Hysterium angustatum is saprobic on dead, decorticate branch of Crataegus
Remarks: season: 3-5

Foodplant / saprobe
pycnidium of Coniothyrium coelomycetous anamorph of Karstenula shepherdiae is saprobic on dead twig of Crataegus
Remarks: season: 5

Foodplant / saprobe
caespitose fruitbody of Kuehneromyces mutabilis is saprobic on decayed, dead stump (large) of Crataegus
Other: minor host/prey

Foodplant / saprobe
often long-stalked apothecium of Lachnum brevipilosum is saprobic on rotten branch of Crataegus
Remarks: season: 1-9

Foodplant / saprobe
short-stalked apothecium of Lachnum cerinum is saprobic on usually decorticate wood of Crataegus
Remarks: season: 3-9

Foodplant / saprobe
fasciculate apothecium of Lachnum fasciculare is saprobic on dead branch of Crataegus
Remarks: season: 4-9

Foodplant / saprobe
superficial, gregarious perithecium of Lasiosphaeria caudata is saprobic on dead branch of Crataegus
Remarks: season: 7-8

Foodplant / saprobe
superficial perithecium of Lasiosphaeria hirsuta is saprobic on old wood of Crataegus
Remarks: season: 9-4

Foodplant / saprobe
superficial, closely packed in large clusters perithecium of Lasiosphaeria spermoides is saprobic on rotting wood of Crataegus
Remarks: season: 11-4

Foodplant / saprobe
fruitbody of Lenzites betulinus is saprobic on dead wood of Crataegus
Other: unusual host/prey

Foodplant / saprobe
fruitbody of Lepiota boertmannii is saprobic on soil of bush of Crataegus

Foodplant / saprobe
fruitbody of Leucoagaricus serenus is saprobic on dead, decayed leaf of litter of Crataegus

Foodplant / open feeder
larva of Lochmaea crataegi grazes on leaf of Crataegus

Foodplant / saprobe
Cytospora coelomycetous anamorph of Lopadostoma turgidum is saprobic on dead, fallen, characteristically reddish-brown branch of Crataegus
Remarks: season: 11-4

Foodplant / saprobe
hysteroid apothecium of Lophodermium foliicola is saprobic on brown, fallen, locally bleached leaf of Crataegus
Remarks: season: 5

Foodplant / miner
caterpillar of Lyonetia clerkella mines live leaf of Crataegus

Foodplant / miner
larva of Magdalis barbicornis mines below cambium of dead twig of Crataegus

Plant / associate
Magdalis cerasi is associated with Crataegus

Foodplant / feeds on
larva of Magdalis ruficornis feeds on dead twig of Crataegus

Foodplant / web feeder
communal caterpillar of Malacosoma neustria feeds from web on live leaf of Crataegus

Foodplant / saprobe
superficial, often in very large clusters pseudothecium of Melanomma pulvis-pyrius is saprobic on dry, hard, decorticate branch wood of Crataegus
Remarks: season: 9-5

Foodplant / saprobe
colony of Gonytrichum dematiaceous anamorph of Melanopsammella inaequalis is saprobic on fallen, dead branch of Crataegus
Remarks: season: 1-12

Foodplant / saprobe
fruitbody of Meripilus giganteus is saprobic on dead trunk (large) of Crataegus

Foodplant / saprobe
sessile, densely clustered, erumpent apothecium of Mollisia caespiticia is saprobic on dead, corticate branch of Crataegus
Remarks: season: 9-4

Foodplant / saprobe
sessile apothecium of Mollisia cinerea is saprobic on dead wood of Crataegus
Remarks: season: 1-12

Foodplant / saprobe
sessile apothecium of Mollisia ligni is saprobic on dead branch of Crataegus
Remarks: season: 1-12

Foodplant / saprobe
long-stalked apothecium of Monilinia johnsonii is saprobic on fallen, mummified fruit of Crataegus
Remarks: season: 3-4

Foodplant / saprobe
hypophyllous, immersed pseudothecium of Mycosphaerella crataegi is saprobic on dead leaf of Crataegus
Remarks: season: 4

Foodplant / saprobe
immersed pseudothecium of Mycosphaerella slaptoniensis is saprobic on dead twig of Crataegus

Foodplant / visitor
adult of Myopa visits for nectar and/or pollen flower of Crataegus

Plant / associate
perithecium of Nectria episphaeria is associated with pyrenomycete infection Crataegus
Remarks: season: 3-5

Foodplant / pathogen
Nectria galligena infects and damages cankered branch of Crataegus

Foodplant / saprobe
effuse colony of Geniculosporium dematiaceous anamorph of Nemania serpens is saprobic on dead branch of Crataegus

Foodplant / open feeder
social larva of Nematus lucidus grazes on leaf of Crataegus

Foodplant / web feeder
communal larva of Neurotoma saltuum feeds from web on leaf of Crataegus

Plant / associate
perithecium of Nitschkia collapsa is associated with fungus-infested Crataegus
Remarks: season: 8-3

Plant / associate
Opilo mollis is associated with Crataegus

Foodplant / saprobe
narrowly stalked apothecium of Orbilia cyathea is saprobic on dead wood of Crataegus
Remarks: season: 8-10

Foodplant / saprobe
apothecium of Orbilia sarraziniana is saprobic on wet bark of Crataegus
Remarks: season: 5-11

Foodplant / open feeder
caterpillar of Orgyia antiqua grazes on live leaf of Crataegus
Remarks: season: -7/8

Foodplant / saprobe
fruitbody of Ossicaulis lignatilis is saprobic on dead, decayed, fallen wood of Crataegus
Other: minor host/prey

Foodplant / saprobe
Diplodia coelomycetous anamorph of Otthia spiraeae is saprobic on dead branch of Crataegus
Remarks: season: 11-4

Foodplant / parasite
fruitbody of Oxyporus populinus parasitises live wood of Crataegus

Foodplant / roller
larva of Pamphilius sylvaticus rolls leaf of Crataegus

Foodplant / web feeder
hypophyllous, colonial Panonychus ulmi feeds from web on live leaf of Crataegus
Remarks: season: 4-

Foodplant / saprobe
solitary or in small group apothecium of Patellariopsis atrovinosa is saprobic on dead branch of Crataegus
Remarks: season: 2-3

Foodplant / saprobe
erumpent, solitary or in small group apothecium of Pezicula sepium is saprobic on dead branch of Crataegus
Remarks: season: 11-3

Foodplant / saprobe
fruitbody of Phaeogalera dissimulans is saprobic on fallen, usually decayed twig of Crataegus
Remarks: season: 11-early 3
Other: minor host/prey

Foodplant / parasite
fruitbody of Phellinus torulosus parasitises live trunk (esp. base) of Crataegus

Foodplant / feeds on
Phloeophagus gracilis feeds on dead or rotten wood of Crataegus

Foodplant / spot causer
hypophyllous, aggregated, smoky brown acervulus of Phloeospora coelomycetous anamorph of Phloeospora oxyacanthae causes spots on live leaf of Crataegus

Foodplant / feeds on
erumpent pycnidium of Phoma coelomycetous anamorph of Phoma crataegi feeds on Crataegus

Foodplant / feeds on
Phyllobius glaucus feeds on Crataegus

Foodplant / feeds on
Phyllobius oblongus feeds on Crataegus

Foodplant / feeds on
Phyllobius pyri feeds on Crataegus

Foodplant / parasite
fruitbody of Phylloporia ribis parasitises live trunk of Crataegus
Other: unusual host/prey

Foodplant / internal feeder
larva of Phytobia carbonaria feeds within twig (cambium) of Crataegus

Foodplant / saprobe
fruitbody of Pluteus thomsonii is saprobic on dead, decayed, often part buried wood of Crataegus
Other: minor host/prey

Foodplant / parasite
cleistothecium of Podosphaera clandestina parasitises live leaf of soft shoot of hedge tree of Crataegus
Remarks: season: 10-11

Foodplant / feeds on
Polydrusus cervinus feeds on Crataegus

Foodplant / feeds on
Polydrusus pterygomalis feeds on Crataegus

Foodplant / saprobe
fruitbody of Polyporus brumalis is saprobic on dead, still attached to fallen tree twig of Crataegus
Remarks: season: early winter-early spring
Other: minor host/prey

Foodplant / saprobe
fruitbody of Polyporus durus is saprobic on dead, fallen, very decayed trunk (large) of Crataegus
Other: minor host/prey

Foodplant / saprobe
fruitbody of Postia balsamea is saprobic on dead, decayed wood of Crataegus
Other: unusual host/prey

Foodplant / saprobe
fruitbody of Postia stiptica is saprobic on dead, decayed wood of Crataegus
Other: unusual host/prey

Foodplant / saprobe
fruitbody of Postia tephroleuca is saprobic on dead, fallen, decayed wood of Crataegus
Other: minor host/prey

Foodplant / saprobe
fruitbody of Postia wakefieldiae is saprobic on dead, fallen, decayed wood of Crataegus

Foodplant / open feeder
larva of Priophorus pallipes grazes on leaf of Crataegus

Foodplant / open feeder
larva of Priophorus pilicornis grazes on leaf of Crataegus
Other: sole host/prey

Foodplant / open feeder
larva of Pristiphora crassicornis grazes on leaf of Crataegus
Other: sole host/prey

Foodplant / sap sucker
nymph of Psallus ambiguus sucks sap of Crataegus
Remarks: season: 5

Foodplant / sap sucker
adult of Psallus perrisi sucks sap of Crataegus
Remarks: season: 6-8

Foodplant / sap sucker
adult of Psallus variabilis sucks sap of Crataegus
Remarks: Other: uncertain

Foodplant / sap sucker
nymph of Psallus wagneri sucks sap of Crataegus
Other: minor host/prey

Foodplant / saprobe
fruitbody of Psathyrella conopilus is saprobic on dead, buried, decayed root of Crataegus
Other: minor host/prey

Foodplant / saprobe
fruitbody of Psathyrella populina is saprobic on dead, decayed wood of Crataegus

Foodplant / saprobe
effuse colony of Pseudospiropes dematiaceous anamorph of Pseudospiropes subuliferus is saprobic on dead bark of Crataegus

Foodplant / sap sucker
Pulvinaria vitis sucks sap of live stem of Crataegus
Remarks: season: 5-6

Foodplant / feeds on
Ramphus oxyacanthae feeds on Crataegus

Foodplant / feeds on
Rhopalomesites tardyi feeds on dead wood of Crataegus

Foodplant / internal feeder
larva of Rhynchites aequatus feeds within fruit of Crataegus
Other: major host/prey

Foodplant / internal feeder
larva of Rhynchites bacchus feeds within fruit of Crataegus

Foodplant / internal feeder
larva of Rhynchites caeruleus feeds within decaying shoot of Crataegus
Other: major host/prey

Foodplant / internal feeder
larva of Rhynchites pauxillus feeds within leaf (midrib) of Crataegus

Foodplant / saprobe
colony of Geniculosporium dematiaceous anamorph of Rosellinia aquila is saprobic on dead branch of Crataegus
Remarks: season: 2-5

Foodplant / saprobe
densely clustered, immersed then breaking through pycnidium of Sclerophoma coelomycetous anamorph of Sclerophoma mali is saprobic on dead fruit of Crataegus

Foodplant / pathogen
colony of anamorph of Sclerotinia crataegi infects and damages mummified haw of Crataegus
Remarks: season: winter

Foodplant / internal feeder
larva of Scolytus mali feeds within cambium of Crataegus

Foodplant / web feeder
communal caterpillar of Scythropia crataegella feeds from web on live leaf of Crataegus
Remarks: season: 5-

Foodplant / saprobe
fruitbody of Skeletocutis nivea is saprobic on dead, fallen, decayed stick of Crataegus
Other: minor host/prey

Foodplant / open feeder
adult of Smaragdina affinis grazes on leaf? of Crataegus
Remarks: season: 5-6

Foodplant / visitor
imago of Stictoleptura scutellata visits for nectar and/or pollen flower of Crataegus
Remarks: season: 6-8

Foodplant / saprobe
effuse colony of Pseudospiropes dematiaceous anamorph of Strossmayeria basitricha is saprobic on dead branch of Crataegus

Foodplant / saprobe
extensively subiculate apothecium of Tapesia fusca is saprobic on dead, fallen branch of Crataegus
Remarks: season: 1-12
Other: minor host/prey

Foodplant / gall
Taphrina crataegi causes gall of live leaf margin of Crataegus

Foodplant / internal feeder
larva of Tetrops praeustus feeds within moribund branch of Crataegus

Foodplant / saprobe
fruitbody of Trametes hirsuta is saprobic on dead wood of Crataegus
Other: minor host/prey

Foodplant / open feeder
larva of Trichiosoma tibiale grazes on leaf of Crataegus
Other: sole host/prey

Foodplant / saprobe
fruitbody of Tubaria dispersa is saprobic on buried, mummified berry of Crataegus
Remarks: season: late spring, early autumn
Other: major host/prey

Foodplant / feeds on
adult of Turdus viscivorus feeds on berry of Crataegus

Foodplant / saprobe
subgregarious to densely scattered, covered then erumpent, blackish grey with paler roundish flat disc stroma of Cytospora coelomycetous anamorph of Valsa ambiens is saprobic on branch of Crataegus
Remarks: season: 10-5

Foodplant / saprobe
immersed pseudothecium of Venturia crataegi is saprobic on dead, fallen leaf of Crataegus
Remarks: season: 4-6

Plant / associate
fruitbody of Verpa conica is associated with Crataegus
Remarks: season: mid 4 - mid 5

Foodplant / gall
haustorium of Viscum album causes gall of branch of Crataegus

Foodplant / saprobe
fruitbody of Volvariella reidii is saprobic on litter of Crataegus
Remarks: Other: uncertain

Foodplant / saprobe
erect, emergent from soil stroma of Xylaria oxyacanthae is saprobic on buried, fallen, fruit of Crataegus

Foodplant / internal feeder
caterpillar of Zeuzera pyrina feeds within live bud of Crataegus