Nigel Cattlin / Elder aphid (Aphis sambuci) infestation on the young shoot of ornamental Elder (Sambucus sp) in garden. Berkshire, England, UK. April.

Nigel Cattlin / Lupin aphid (Macrosiphum albifrons) infestation on stem and apical shoots of young Tree lupin (Lupinus arboreus). Berkshire, England, UK. May.

Nigel Cattlin / Glasshouse-potato aphid (Aulacorthum solani) colony on Hibiscus (Hibiscus sp) flower bud, house plant.

Nigel Cattlin / Glasshouse-potato aphid (Aulacorthum solani) colony on Hibiscus (Hibiscus sp) flower bud, house plant.

Nigel Cattlin / Glasshouse / Tuber mealybugs (Pseudococcus viburni) on stem of house plant, close up. UK, January.

Nigel Cattlin / Glasshouse / Tuber mealybugs (Pseudococcus viburni) on stem of house plant, close up. UK, January.

Nigel Cattlin / Horse chestnut leaf miner (Cameraria ohridella) larval damage to Horse chestnut (Aesculus hippocastanum) leaves. Berkshire, England, UK. August.

Nigel Cattlin / Mealy cabbage aphid (Brevicoryne brassicae) infestation on Brassica stem. Berkshire, England, UK. June.

Nigel Cattlin / Mealy cabbage aphid (Brevicoryne brassicae) infestation on Brassica stem. Berkshire, England, UK. June.

Nigel Cattlin / Mealy cabbage aphid (Brevicoryne brassicae) infestation on secondary host plant Hedge mustard (Alliaria petiolata). Berkshire, England, UK. June.

Nigel Cattlin / Potato aphid (Macrosiphum euphorbiae) infestation on Tulip (Tulipa sp) petal. Berkshire, England, UK. May.

Nigel Cattlin / Corky brown damage to Pear (Pyrus communis) fruit possibly caused by early Eriophyid (Eriophyidae) blister mite infestation. Berkshire, England, UK. September.

Nigel Cattlin / Large white butterfly (Pieris brassicae) first or second instar caterpillars and empty egg case on Cabbage (Brassicaceae) leaf. Berkshire, England, UK. August.

Nigel Cattlin / Large white butterfly (Pieris brassicae) first or second instar caterpillars and empty egg case on Cabbage (Brassicaceae) leaf. Berkshire, England, UK. August.

Nigel Cattlin / Glasshouse mealybug (Pseudococcus viburni) infestation on Bougainvillea (Bougainvillea sp) peduncle in conservatory, UK. August.

Nigel Cattlin / Foxglove aphid (Aulacorthum solani) infestation on Bougainvillea (Bougainvillea sp) flower in conservatory, UK. August.

Nigel Cattlin / Large cabbage white (Pieris brassicae) caterpillars feeding on Broccoli (Brassica oleracea) leaf. Berkshire, England, UK. August.

Nigel Cattlin / Large cabbage white (Pieris brassicae) caterpillars on Broccoli (Brassica oleracea) leaf. Berkshire, England, UK. August.

Nigel Cattlin / Seven-spot ladybird (Coccinella septem-punctata) larva predating Black bean aphids (Aphis fabae) on Runner bean (Phaseolus coccineus). Bean with buds. Berkshire, England, UK. July.

Nigel Cattlin / Buff-tailed bumblebee (Bombus terrestris) nectaring on Spear thistle (Cirsium vulgare), thistle with Pollen beetle (Brassicogethes aeneus) infestation. Berkshire, England, UK. July.

Nigel Cattlin / Pollen beetle (Brassicogethes aeneus) infestation on Nipplewort (Lapsana communis). Berkshire, England, UK. July.

Nigel Cattlin / Black bean aphid (Aphis fabae) infestation on Runner bean (Phaseolus coccineus), stem twining up bamboo cane. Berkshire, England, UK. June.

Nigel Cattlin / Black bean aphid (Aphis fabae) infestation on flowering Broad bean (Vicia faba). Berkshire, England, UK. June.

Nigel Cattlin / Black bean aphid (Aphis fabae) infestation on Broad bean (Vicia faba) plant. Berkshire, England, UK. June.

Nigel Cattlin / Glasshouse mealy bug (Pseudococcus viburni) honeydew from infestation on Lemon (Citrus limon) fruit, cultivated in conservatory.

Nigel Cattlin / Glasshouse mealy bug (Pseudococcus viburni) infestation on Lemon (Citrus limon) fruit, cultivated in conservatory.

Adrian Davies / Oak processionary moth (Thaumetopoea processionea) nest removal from infested Oak (Quercus sp) tree with cherry picker. Surrey, England, UK. July 2018.

Nigel Cattlin / Brassica pod midge (Dasineura brassicae) larvae infestation in open Oilseed rape (Brassica napus napus) seed pod. England, UK.

Nigel Cattlin / Californian red scale insect (Aonidiella aurantii) scales on Orange (Citrus sinensis) leaf, zonal chlorosis present. Native to China. Sicily, Italy. October.

Nigel Cattlin / Bird cherry-oat aphid (Rhopalosiphum padi) infestation on Wheat (Triticum aestivum) leaf with Barley yellow dwarf virus (BYDV) symptoms present.

Nigel Cattlin / Spotted snake millepede (Blaniulus guttulatus) inside a damaged Carrot (Daucus carota) root.

Nigel Cattlin / Cabbage root fly (Delia radicum) larva with frass in damaged Oilseed rape (Brassica napus napus) root.

Nigel Cattlin / Two spotted spider mite (Tetranychus urticae) webbing and damage to leaves of Green bean (Phaseolus vulgaris) plant. England, UK.

Nigel Cattlin / European red mite (Panonychus ulmi) eggs overwintering on Apple (Malus domestica) wood.

Nigel Cattlin / European red mite (Panonychus ulmi) eggs overwintering on Apple (Malus domestica) wood.

Nigel Cattlin / Termite (Reticulitermes sp) workers on damaged wooden skirting board with debris and frass.

Nigel Cattlin / Cabbage whitefly (Aleyrodes proletella) eggs in circular patterns on a Cabbage (Brassica sp) leaf. Photomicrograph.

Nigel Cattlin / Brassica pod midge (Dasineura brassicae) larvae infestation in Oilseed rape (Brassica napus napus) seed pod.

Nigel Cattlin / Rape winter stem weevil (Ceutorhynchus picitarsis) larvae in damaged Oilseed rape (Brassica napus napus) stem.

Nigel Cattlin / Californian red scale (Aonidiella aurantii) infestation on Lemon (Citrus limon) wood. Native to China. Sicily, Italy. October.

Nigel Cattlin / Cabbage root fly (Delia radicum) larvae with frass in damaged Oilseed rape (Brassica napus napus) root.

Nigel Cattlin / Beet armyworm (Spodoptera exigua), group of caterpillars feeding on Chrysanthemum (Chrysanthemum sp) flower. Pests of ornamental plants and many crops. Native to SE Asia.

Nigel Cattlin / European red mite (Panonychus ulmi) eggs overwintering on Apple (Malus domestica) wood.

Nigel Cattlin / Termite (Reticulitermes sp) workers on damaged wooden skirting board with debris and frass.

Nigel Cattlin / Termite (Reticulitermes sp) workers on damaged wooden skirting board with debris and frass.

Nigel Cattlin / Apple sawfly (Hoplocampa testudinea) larva inside damaged Apple (Malus domestica) fruit, in cross section.

Nigel Cattlin / German cockroach (Blatella germanica) on diced Carrot.

Nigel Cattlin / Termite (Reticulitermes sp) workers and nymph on damaged wooden skirting board with debris and frass. Nymph with longer body and wing buds.

Nigel Cattlin / Termite (Reticulitermes sp) workers and soldier on damaged wooden skirting board with debris and frass.

Nigel Cattlin / Cabbage root fly (Delia radicum) larvae with frass in damaged Oilseed rape (Brassica napus napus) root.

Nigel Cattlin / Californian red scale (Aonidiella aurantii) infestation on Lemon (Citrus limon) wood. Native to China. Sicily, Italy. October.

Nigel Cattlin / Californian red scale (Aonidiella aurantii) infestation on Lemon (Citrus limon) stem. Native to China. Sicily, Italy. October.

Nigel Cattlin / Cotton leafworm (Spodoptera littoralis) caterpillars feeding on Cotton (Gossypium sp) leaf. Morocco.

Nigel Cattlin / Spiny bollworm (Earias insulana) caterpillar on damaged Cotton (Gossypium sp) boll. Morocco.

Nick Hawkins / A young moose (Alces alces) with a condition known as 'ghost moose' which is caused by heavy tick infestation, New Brunswick, Canada. August

Jeff Foott / Mountain Pine Beetle (Dendroctonus ponderosae) killed trees, Jasper National Park, Alberta, Canada

Jeff Foott / Mountain Pine Beetle (Dendroctonus ponderosae) killed trees, Jasper National Park, Alberta, Canada

Jeff Foott / Ponderosa Pine (Pinus ponderosa) dead trees killed by Mountain Pine Beetle (Dendroctonus ponderosae), El Capitan, Yosemite National Park, California

Jeff Foott / Ponderosa Pine (Pinus ponderosa) dead tree, with pitch tube, killed by Mountain Pine Beetle (Dendroctonus ponderosae), Yosemite National Park, California

Jeff Foott / Ponderosa Pine (Pinus ponderosa) dead trees killed by Mountain Pine Beetle (Dendroctonus ponderosae), Yosemite National Park, California

Jeff Foott / Ponderosa Pine (Pinus ponderosa) dead trees killed by Mountain Pine Beetle (Dendroctonus ponderosae), Yosemite National Park, California

Jeff Foott / Ponderosa Pine (Pinus ponderosa) dead trees killed by Mountain Pine Beetle (Dendroctonus ponderosae), Yosemite National Park, California

Jeff Foott / Ponderosa Pine (Pinus ponderosa) dead trees killed by Mountain Pine Beetle (Dendroctonus ponderosae), Yosemite National Park, California

David Perpinan / Captive bearded dragon (Pogona vitticeps) suffering from mite infestation. Small repro only

Jeff Foott / Elk (Cervus elaphus canadensis) and dead trees killed by Mountain pine beetle infestation (Dendroctonus ponderosae), Rocky Mountain National Park, Colorado, USA. September. The current outbreak of mou...

Ingo Arndt / Migratory Locust (Locusta migratoria capito) swarm flying, near Isalo National Park, Madagascar. August 2013.

Tony Wu / Humpback whale (Megaptera novaeangliae) calf with an infestation of whale lice (Cyamus boopis), an ectoparasite that lives exclusively on humpback whales, Vava'u, Tonga, South Pacific

Georgette Douwma / Acoel flatworms (Waminoa sp) on polyps of Bubble coral (Plerogyra sinuosa) Indonesia. This flatworm can cover the whole surface of some corals, leaving them no way to catch plankton and their symbioti...

Georgette Douwma / Acoel flatworms (Waminoa sp) on polyps of Bubble coral (Plerogyra sinuosa) Indonesia. This flatworm can cover the whole surface of some corals, leaving them no way to catch plankton and their symbioti...

Jeff Foott / Mountain Pine Beetle (Dendroctonus ponderosae) killed trees fueling forest fire, Colorado

Jeff Foott / Mountain Pine Beetle (Dendroctonus ponderosae) pair killed by resin, Colorado

Jeff Foott / Mountain Pine Beetle (Dendroctonus ponderosae) killed Lodgepole Pine (Pinus contorta), Grand Teton National Park, Wyoming

Jeff Foott / Lodgepole Pine (Pinus contorta) tree with pheromone packet to deter an attack from Mountain Pine Beetle (Dendroctonus ponderosae), Colorado

Jeff Foott / Mountain Pine Beetle (Dendroctonus ponderosae) killed Whitebark Pine (Pinus albicaulis) trees, Bridger-Teton National Forest, Wyoming

Jeff Foott / Mountain Pine Beetle (Dendroctonus ponderosae) killed Whitebark Pine (Pinus albicaulis) trees, Bridger-Teton National Forest, Wyoming

Jeff Foott / Campground being cleared of dead trees, killed by beetles, Rocky Mountain National Park, Colorado

Jeff Foott / Lodgepole Pine (Pinus contorta) forest killed by Mountain Pine Beetle (Dendroctonud ponderosae), Colorado

Jeff Foott / Lodgepole Pine (Pinus contorta) forest killed by Mountain Pine Beetle (Dendroctonud ponderosae), Colorado

Jeff Foott / Mountain Pine Beetle (Dendroctonus ponderosae) killed Whitebark Pine (Pinus albicaulis) trees, Bridger-Bridger-Teton National Forest, Wyoming

Jeff Foott / Mountain Pine Beetle (Dendroctonus ponderosae) killed trees, Rocky Mountain National Park, Colorado

Jeff Foott / Mountain Pine Beetle (Dendroctonus ponderosae) killed Lodgepole Pine (Pinus contorta) forest, Colorado

Jeff Foott / Mountain Pine Beetle (Dendroctonus ponderosae) pupa in Lodgepole Pine (Pinus contorta), Wyoming

Jeff Foott / Lodgepole Pine (Pinus contorta) pitch tubes, showing where Mountain Pine Beetle (Dendroctonus ponderosae) attacked tree, and tree tried to pitch it out, Colorado

Jeff Foott / Mountain Pine Beetle (Dendroctonus ponderosae) larvae under tree bark, Grand Teton National Park, Wyoming

Jeff Foott / Mountain Pine Beetle (Dendroctonus ponderosae) larvae under tree bark, Grand Teton National Park, Wyoming

Jeff Foott / Mountain Pine Beetle (Dendroctonus ponderosae) larva under tree bark, Grand Teton National Park, Wyoming

Jeff Foott / Mountain Pine Beetle (Dendroctonus ponderosae) in tunnel under bark, Colorado

Jeff Foott / Mountain Pine Beetle (Dendroctonus ponderosae) in tunnel under bark, Colorado

Jeff Foott / Mountain Pine Beetle (Dendroctonus ponderosae) successfully 'pitched out' by tree defense, Grand Teton National Park, Wyoming

Jeff Foott / Mountain Pine Beetle (Dendroctonus ponderosae) killed Lodgepole Pine (Pinus contorta) forest with some healthy trees, Colorado

Jeff Foott / Mountain Pine Beetle (Dendroctonus ponderosae) killed tree, Rocky Mountain National Park, Colorado

Jeff Foott / Mountain Pine Beetle (Dendroctonus ponderosae) killed trees, Rocky Mountain National Park, Colorado

Nick Upton / European robin (Erithacus rubecula) partially bald due to an infestation of feather mites (Dermanyssidae), Gloucestershire, UK, April.

Philippe Clement / Red mason bee (Osmia bicornis / Osmia rufa) infested with Hairy-footed mites (Chaetodactylus) Belgium, April

Alex Hyde / Mistletoe (Viscum album) infestation in Common lime tree (Tilia x europaea). Somerset UK. February.

Phil Savoie / Early bumblebee (Bombus pratorum) queen feeding, with heavy mite infestation between head and thorax, Monmouthshire, Wales, UK, March.