Citrus Mealybug
Planococcus citri
📖 Description
Citrus Mealybug is a major polyphagous pest of citrus orchards and vineyards across the Indian subcontinent, particularly damaging in Nagpur mandarin belt, Andhra Pradesh sweet orange orchards, and Maharashtra grape vineyards. The pest prefers tender flush growth and clusters in leaf axils, fruit stalks and root crowns. Heavy infestation causes yellowing, defoliation, fruit drop and sooty mold that renders fruit unmarketable. The classical biological control agent Cryptolaemus montrouzieri (the ‘mealybug destroyer’ ladybird, originally imported from Australia in 1928) provides excellent suppression when broad-spectrum insecticides are avoided. Conservation of native parasitoids (Leptomastix dactylopii, Anagyrus pseudococci) through reduced insecticide use is the cornerstone of sustainable management. Ant control is critical — ants tend mealybugs for honeydew and actively protect them from natural enemies, so eliminating ant colonies often allows biocontrol to suppress mealybug populations naturally.
⚠️ Symptoms to watch for
- Yellowing and curling of leaves, sooty mold growth on honeydew-drenched foliage and fruit, fruit drop and deformation, white waxy masses in leaf axils and fruit clusters, defoliation in severe cases, transmission of Citrus Tristeza Virus (CTV) and Grapevine Leafroll Virus, fruit downgrading and unmarketability
🩹 Treatment
- Conserve native parasitoids (Leptomastix, Anagyrus), release Cryptolaemus montrouzieri @ 5-10 beetles per tree, spray neem oil 1% with sticker, apply need-based insecticide avoiding bloom period
🌿 Organic treatments
- Release Cryptolaemus montrouzieri (mealybug destroyer) @ 5-10 adults/tree, release Leptomastix dactylopii @ 5000/ha (parasitoid), spray neem oil 1% + 5 g/L soap, apply Verticillium lecanii @ 5 g/L, spray fish oil rosin soap @ 25 g/L, prune and burn infested shoots
🧪 Chemical treatments
- Chlorpyriphos 20 EC @ 2 ml/L, Buprofezin 25 SC @ 1.5 ml/L, Spiromesifen 240 SC @ 0.5 ml/L, Diafenthiuron 50 WP @ 1 g/L, Imidacloprid 17.8 SL @ 0.3 ml/L (soil drench for systemic action), Azadirachtin 10000 ppm @ 2 ml/L
🛡️ Prevention
- Plant certified nursery stock, quarantine new plantings, prune and destroy infested water sprouts and suckers, control ants (they protect mealybugs from parasitoids), maintain balanced nutrition, avoid excess nitrogen, monitor with pheromone traps for males, plant windbreaks to reduce dispersal
🪴 Affected plants
- Citrus, Grapevine, Pomegranate, Mango, Guava, Fig, Coffee, Cocoa, Ornamentals (Croton, Begonia, Hibiscus)
🦋 Natural predators
- Cryptolaemus montrouzieri, Leptomastix dactylopii, Anagyrus pseudococci, Scymnus coccivorus, Spiders, Lacewing Larvae
🌱 Host plants
- Citrus spp., Vitis vinifera, Punica granatum, Mangifera indica, Psidium guajava, Coffea arabica
🔄 Lifecycle
- Female lays 300-600 eggs in cottony ovisac.
- Eggs hatch in 6-10 days.
- Nymphs pass through 3 instars (female) or 4 instars (male + pupa) over 20-40 days.
- Adult female lifespan 30-60 days; male lifespan 3-7 days (no feeding).
- Total life cycle 30-50 days; 6-8 generations per year.
📅 Season
- Year-round, peaks Mar-Jun and Sep-Nov during flush periods
🔎 Appearance
- Adult female is oval, soft-bodied, pinkish-yellow covered with white mealy wax; has 18 pairs of short lateral wax filaments of equal length and two short tail filaments.
- Body segmentation visible through wax.
- Males are tiny two-winged insects with two long tail filaments.
- Eggs laid in white cottony ovisacs.
💥 Damage level
- Moderate
🔁 Reproduction rate
- Rapid
🗺️ Geographic regions
- Indian Subcontinent
- Cosmopolitan in Tropics and Subtropics
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