Asian Citrus Psyllid
Diaphorina citri
Fungal & Bacterial Vectors Severe Risk 3-4 mm
📖 Description
The Asian citrus psyllid is the most devastating insect threat to citrus worldwide due to its role as the vector of Candidatus Liberibacter asiaticus, the bacterium that causes citrus greening disease (Huanglongbing or HLB). This disease has no cure and kills infected trees within 5-8 years. It has decimated citrus industries in Florida, Brazil, and China, causing billions of dollars in losses. The psyllid itself is relatively small and unassuming, but the disease it spreads makes it arguably the most destructive insect in global agriculture.
⚠️ Symptoms to watch for
- Citrus greening disease (Huanglongbing/HLB),Asymmetric blotchy mottle on leaves,Small, misshapen, bitter fruit,Excessive fruit drop,Yellow shoots and branch dieback,Tree death within 5-8 years of infection
🩹 Treatment
- Apply horticultural oil to smother nymphs (organic),Release Tamarixia parasitic wasps (organic),Use kaolin clay as feeding deterrent (organic),Apply systemic imidacloprid as soil drench (chemical),Spray with chlorpyrifos or dimethoate (chemical)
🌿 Organic treatments
- Apply horticultural oil to smother nymphs,Release Tamarixia parasitic wasps,Use kaolin clay as feeding deterrent
🧪 Chemical treatments
- Apply systemic imidacloprid as soil drench,Spray with chlorpyrifos or dimethoate
🛡️ Prevention
- Source citrus trees only from certified nurseries,Remove all citrus trees showing greening symptoms immediately,Coordinate area-wide psyllid management with neighbors,Regularly inspect new flush for psyllid nymphs and adults
🪴 Affected plants
- Citrus Trees,Orange Jasmine,Curry Leaf,Boxwood
🦋 Natural predators
- Tamarixia Wasps,Ladybugs,Green Lacewings
🌱 Host plants
- Citrus spp.,Murraya paniculata,Bergera koenigii,Severinia buxifolia
🔄 Lifecycle
- Females lay 300-800 yellow-orange eggs on young flush tips.
- Eggs hatch in 2-4 days.
- Nymphs develop through 5 instars over 10-14 days, producing waxy tubules.
- Adults live 30-60 days.
- In warm climates, 8-10 generations per year are possible, with overlapping generations year-round.
📅 Season
- Year-round in tropical/subtropical areas
🔎 Appearance
- Small, brownish-gray insect with mottled wings held at a 45-degree angle when at rest.
- Has distinctive tubular structures at the posterior end.
- Nymphs are yellowish-orange with red eyes and produce white waxy tubules.
💥 Damage level
- Severe
🔁 Reproduction rate
- Rapid
🗺️ Geographic regions
- Asia
- North America
- South America
- Africa
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