Foodplant / gall
Agrobacterium tumefaciens causes gall of stem (esp. base) of Pyrus communis sens. str.
Foodplant / pathogen
Apple Robbery Wood phytoplasma infects and damages live Pyrus communis sens. str.
In Great Britain and/or Ireland:
Foodplant / spot causer
black pycnidium of Ascochyta coelomycetous anamorph of Ascochyta pirina causes spots on fruit of Pyrus communis sens. str.
Foodplant / open feeder
epiphyllous, colonial Bryobia grazes on live leaf of Pyrus communis sens. str.
Foodplant / pathogen
basidiome of Chondrostereum purpureum infects and damages trunk of Pyrus communis sens. str.
Other: unusual host/prey
Foodplant / saprobe
long covered, but eventually erumpent through fissure pycnidium of Phomopsis coelomycetous anamorph of Diaporthe eres is saprobic on dead twig of Pyrus communis sens. str.
Foodplant / spot causer
epiphyllous, subcuticular acervulus of Entomosporium coelomycetous anamorph of Diplocarpon mespili causes spots on live leaf of Pyrus communis sens. str.
Other: unusual host/prey
Foodplant / sap sucker
Dysaphis pyri sucks sap of live, curled, discoloured leaf of Pyrus communis sens. str.
Remarks: season: early spring-7, autumn-
Foodplant / pathogen
Erwinia amylovora infects and damages dead, brown-black, wrinkled fruit of Pyrus communis sens. str.
Foodplant / pathogen
Gibberella baccata infects and damages fruit of Pyrus communis sens. str.
Foodplant / spot causer
colony of Gloeodes anamorph of Gloeodes pomigena causes spots on live, sometimes dwarfed fruit of Pyrus communis sens. str.
Foodplant / pathogen
Glomerella cingulata infects and damages fruit of Pyrus communis sens. str.
Other: major host/prey
Foodplant / parasite
epiphyllous pycnium of Gymnosporangium asiaticum parasitises live leaf of Pyrus communis sens. str.
Foodplant / gall
hypophyllous aecium of Gymnosporangium clavariiforme causes gall of live leaf of Pyrus communis sens. str.
Remarks: season: 7-9+
Other: minor host/prey
Plant / resting place / within
ovum of Hoplocampa brevis may be found in ovary of Pyrus communis sens. str.
Other: sole host/prey
Foodplant / pathogen
Monilinia fructigena infects and damages live, brown-rotten fruit of Pyrus communis sens. str.
Foodplant / pathogen
Monilinia laxa infects and damages live, wilted flower of Pyrus communis sens. str.
Foodplant / saprobe
Mucor piriformis is saprobic on rotting fruit of Pyrus communis sens. str.
Foodplant / spot causer
amphigenous, erumpent pseudothecium of Mycosphaerella pyri causes spots on leaf of Pyrus communis sens. str.
Foodplant / web feeder
hypophyllous, colonial Panonychus ulmi feeds from web on live leaf of Pyrus communis sens. str.
Remarks: season: 4-
Foodplant / pathogen
colony of Penicillium dematiaceous anamorph of Penicillium expansum infects and damages soft, brown, rotten, musty-smelling fruit of Pyrus communis sens. str.
Other: major host/prey
Foodplant / sap sucker
Pentatoma rufipes sucks sap of Pyrus communis sens. str.
Other: major host/prey
minor host/prey
Foodplant / pathogen
conidioma of Phlyctema coelomycetous anamorph of Pezicula alba infects and damages fruit of Pyrus communis sens. str.
Other: minor host/prey
Foodplant / pathogen
conidioma of Cryptosporiopsis coelomycetous anamorph of Pezicula malicorticis infects and damages rotten fruit of Pyrus communis sens. str.
Other: minor host/prey
Foodplant / pathogen
scattered or clustered, immersed, then semi-immersed, finally superficial pycnidium of Phomopsis coelomycetous anamorph of Phomopsis perniciosa infects and damages cankered fruit of Pyrus communis sens. str.
Foodplant / pathogen
Phytophthora cactorum infects and damages fallen fruit of Pyrus communis sens. str.
Foodplant / pathogen
Phytophthora syringae infects and damages fallen fruit of Pyrus communis sens. str.
Foodplant / open feeder
larva of Pristiphora abbreviata grazes on leaf of Pyrus communis sens. str.
Other: sole host/prey
Foodplant / pathogen
Pseudomonas syringae infects and damages flower of Pyrus communis sens. str.
Foodplant / sap sucker
nymph of Psylla pyricola sucks sap of fouled, sticky, mouldy leaf of Pyrus communis sens. str.
Foodplant / pathogen
Rhizopus stolonifer infects and damages fruit of Pyrus communis sens. str.
Foodplant / pathogen
Rosellinia necatrix infects and damages yellowing, prematurely falling leaf of Pyrus communis sens. str.
Other: major host/prey
Plant / resting place / on
male of Taeniothrips inconsequens may be found on live Pyrus communis sens. str.
Remarks: season: 3-6,115
Foodplant / internal feeder
larva of Xyleborus dispar feeds within live cambium of Pyrus communis sens. str.
Foodplant / internal feeder
caterpillar of Zeuzera pyrina feeds within live bud of Pyrus communis sens. str.