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Citrus Psylla

Diaphorina citri

Citrus Psylla, Asian Citrus Psyllid, Asian Citrus Sucker, Oriental Citrus Psyllid

A close up of a Diaphorina citri Asian citrus psyllid on a citrus plant
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The Asian Citrus Psyllid is a tiny insect that amounts to only half a centimetre long. Although small, these insects are extremely dangerous pests that can have devastating impacts on citrus plants. They're a sap-sucking true bug which feeds from the phloem of plants; these are the cells responsible for transporting sugars to different areas of the plant. They do this using their mouthparts which resembles a fine feeding tube. This needle-like structure makes them perfect vectors to pass pathogens on to other plants. More specifically, these insects are carriers of Huanglongbing (citrus greening disease), and this is a fast killer of citrus plants.
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These insects carry a nasty disease that's a killer of citrus plants.


Adults are 3-4mm. They're mottled yellowish-brown. The head is light brown. The stomachs are more of a green-brown colour. The females can sometimes appear brighter yellow; this means they're almost ready to begin egg-laying. Nymphs are often confused with aphids. They're yellow to dark brown and have distinctive red eyes. They're only about 0.25mm.


Young flowers may drop and fall prematurely. Fruits begin to fall prematurely. Fruits begin to taste bitter. Honeydew, a digestion byproduct, may be evident over the leaves of citrus. These psyllids inject a toxin into plants when feeding. This can distort leaves and shoots, sometimes causing leaf-curl. Plant die backs may be evident. Plants don't usually survive.











Asia and the USA


Citrus plants are particularly vulnerable.
A group of oranges on a Citrus reticulata plant in a garden


Citrus reticulata

Lemon Tree

Citrus x limon

A close up of some Pinguicula moranensis with a pink flower


Pinguicula moranensis

A purple Pinguicula vulgaris flower on a plant

Common Butterwort

Pinguicula vulgaris

Persian Lime

Citrus × latifolia

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