Pascal Pittorino / Lemon tree (Citrus limon) covered in snow, Var, Provence, France, February.

Wild Wonders of Europe / Lilja / Orange tree (Citrus sinensis) flowers and fruit, Crete, Greece, April 2009

Marie Lochman / Female Bee fly (Aleucosia tridentata) feeding on Pepper and salt bush (Philotheca spicata) flowers, Wandoo Conservation Park, Darling Range, South west Western Australia.

Marie Lochman / Male Bee fly (Aleucosia arguta) feeding on Pepper and salt bush (Philotheca spicata) flowers, Wandoo Conservation Park, Darling Range, Western Australia.

Nigel Cattlin / Citrus greening (Candidatus Liberibacter), vector transmitted bacterial disease causing uneven ripening, on Orange (Citrus sinensis) fruit, South Africa.

Nigel Cattlin / Normal, mono-embryonic Orange (Citrus sinensis) seedlings with normal single development of root and shoot.

Nigel Cattlin / Two polyembryonic Orange (Citrus sinensis) seedlings showing bifurcation, a malformation, with each seed developing two plants.

Bruce Thomson / Orange-backed troupial (Icterus croconotus) feeding in orange tree, Pocone, Brazil.

Paul Harcourt Davies / Caterpillar of Common yellow swallowtail butterfly (Papilio machaon), dark morph, feeding on Common rue (Ruta graveolens) as a foodplant, Umbria, Italy. October.

Paul Harcourt Davies / Caterpillar of Common yellow swallowtail butterfly (Papilio machaon), dark morph, on Common rue (Ruta graveolens) as a foodplant, Umbria, Italy. October.

Paul Harcourt Davies / Caterpillar of Common yellow swallowtail butterfly (Papilio machaon) on Common rue (Ruta graveolens) as a foodplant, Umbria, Italy. October.

Paul Harcourt Davies / Buff-tailed bumblebee (Bombus terrestris) visiting flower of Dittany (Dictamnus albus), Umbria, Italy. May.

Paul Harcourt Davies / Citrus mealybugs (Planococcus sp.) resting on leaf, Umbria, Italy. May.

Paul Harcourt Davies / Dittany (Dictamnus albus) in flower, in woodland, Umbria Italy. May.

Paul Harcourt Davies / Lemon (Citrus limon) flower, Umbria, Italy. June.

Paul Harcourt Davies / Lemon (Citrus limon) flower, buds and fruit, Umbria, Italy. June.

Barry Mansell / Little leaf notcher (Artipus floridanus) pair mating on leaf, pest of lawns and citrus plants, North Florida, USA.

Barry Mansell / Little leaf notcher (Artipus floridanus) pair mating on leaf, pest of lawns and citrus plants, North Florida, USA.

Barry Mansell / Citrus root weevil (Draprepes abbreviatus) on leaf, North Florida, USA. Controlled specimen.

Nigel Cattlin / Citrus mealybug (Planococcus citri) infestation on the leaves and stem of a bougainvillea (Nyctaginaceae) grown on a conservatory, Berkshire, UK, April.

Eladio Fernandez / A lime butterfly (Papilio demoleus) rests on a leaf after a light rain in the Jardin Botanico de Santo Domingo. This butterfly species is a recent introduction to island of Hispaniola (Dominican Repub...

Eladio Fernandez / A lime butterfly (Papilio demoleus) rests on a leaf after a light rain the Jardin Botanico de Santo Domingo, Dominican Republic. This species was introduced and feeds primarily on citrus. Sometimes it...

Derek Galon / Ripe grapefruits on a tree (Citrus paradisi). Dominica, Eastern Caribbean.

Dave Watts / Whitey wood (Acradenia frankliniae). Tasmania, Australia. November.

Dave Watts / Stinkwood (Zieria arborescens). Tasmania, Australia. October.

Dave Watts / Tasmanian waxflower (Philotheca virgata). Tasmania, Australia. November.

Dave Watts / Satin wood (Nematolepis squamea). Tasmania, Australia. October.

Dave Watts / Common correa (Correa reflexa). Tasmania, Australia. November.

Dave Watts / Common correa (Correa reflexa). Tasmania, Australia. January.

Dave Watts / White correa (Correa alba). Tasmania, Australia. January.

Dave Watts / Hairy boronia (Boronia pilosa). Tasmania, Australia. November.

Dave Watts / River boronia (Boronia gunnii). Tasmania, Australia. November.

Dave Watts / Lemon-scented boronia (Boronia citriodora). Tasmania, Australia. January.

Dave Watts / Stinky boronia (Boronia anemonifolia). Tasmania, Australia. November.

Rolf Nussbaumer / Tennessee warbler (Leiothlypis peregrina) flock feeding on oranges amongst other warblers. South Padre Island, Texas, USA.

Franco Banfi / Lemons for sale at market, Penisola Sorrentina, Costa Amalfitana, Italy,

Franco Banfi / Stall with chilli peppers, garlic, limoncello, lemons and citrons, Penisola Sorrentina, Costa Amalfitana, Italy.

Jeff Foott / Orange (Citrus sinensis) trees outside Mission San Francisco Javier. Near Loreto, Baja California Sur, Mexico. 2020.

Paul Harcourt Davies / Bumblebee (Bombus sp) pollinator on Dittany (Dictamnus albus) Orvieto, Umbria Italy, May.

Wendy Shattil / Citrus orchard, aerial view. McAllen, Hidalgo County, Texas, USA.

Derek Galon / Freshly picked limes. Dominica, West Indies. Limes from Dominica are especially large and juicy. August 2019

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.

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

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 / 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.

Heather Angel / Common rue (Ruta graveolens) flower. Cultivated in herb garden, Surrey, England, UK. Native to Balkan Peninsula.