Arecanut Mite
Raoiella indica
Mites & Ticks (Arachnids) High Risk 0.3–0.4 mm (adult female); 0.25 mm (adult male)
📖 Description
Raoiella indica is a major invasive mite pest of palms across the tropics. Indian arecanut production is approximately 130,000 tonnes from 480,000 ha, with the largest tracts in Karnataka (49 % of national area), Kerala, and Assam. The species has undergone dramatic range expansion since 2004 — spreading from its native South Asia to the Caribbean (2004), Florida (2007), Brazil (2008), and West Africa (2016). It is now considered one of the world’s most damaging invasive mite pests of palms. In India, severe outbreaks on arecanut were reported from Dakshina Kannada in 2017, with infestation rates of 60–80 % of palms in some plantations. The mite’s rapid spread is facilitated by wind dispersal of larvae and by human movement of infested plant material.
⚠️ Symptoms to watch for
- Yellow spotting on the upper surface of leaflets, corresponding to dense colonies of red mites on the underside; heavily infested fronds turn yellow-brown, dry out, and hang down; severe infestation reduces nut size, weight, and quality; long-term defoliation kills the palm. The mite is a quarantine pest in many coconut-growing countries and has spread rapidly across the tropics in the past two decades.
🩹 Treatment
- Spray dicofol 18.5 EC at 2.5 ml/L or wettable sulphur 80 WP at 5 g/L on the underside of fronds. Use a power sprayer with a long lance to reach the undersides of tall palms. Release the predatory mite Amblyseius swirskii at 50 mites/palm as a biological control. Apply neem oil (1 % Azadirachtin) at 5 ml/L plus sticker — repeat at 14-day intervals.
🌿 Organic treatments
- Release predatory mites (Amblyseius swirskii, Neoseiulus longispinosus) at 50 mites per palm. Spray neem oil (1 % Azadirachtin) at 5 ml/L plus sticker at 14-day intervals. Apply wettable sulphur 80 WP at 5 g/L. Maintain humidity by overhead misting in polyhouses — the mite thrives in dry conditions. Avoid broad-spectrum insecticides that kill predatory mites.
🧪 Chemical treatments
- Dicofol 18.5 EC (2.5 ml/L), wettable sulphur 80 WP (5 g/L), or propargite 57 EC at 2 ml/L. Apply as a high-volume spray to the underside of all fronds. Repeat at 14-day intervals until mites are no longer detected. Rotate miticides to prevent resistance development.
🛡️ Prevention
- Maintain adequate palm spacing (2.7 m × 2.7 m for arecanut) for airflow. Avoid water stress — drought-stressed palms are more susceptible. Monitor weekly during the dry season (December–May). Remove and burn severely infested fronds. Quarantine new palm plantings to prevent introduction of the mite.
🪴 Affected plants
- Arecanut (Areca catechu) is the primary host in India; the mite has a very broad host range including coconut, date palm, banana, heliconia, gingers, and many ornamentals. The species is a major pest of arecanut in Karnataka (Dakshina Kannada, Udupi, Shimoga), Kerala (Kasaragod, Kannur, Kozhikode), and Assam.
🦋 Natural predators
- Predatory mites (Amblyseius swirskii, Neoseiulus longispinosus, Amblyseius largoensis), predatory beetles (Stethorus spp.), lacewing larvae (Chrysoperla), and entomopathogenic fungi (Hirsutella thompsonsoni, Beauveria bassiana).
🌱 Host plants
- Areca catechu (arecanut — primary host in India), Cocos nucifera (coconut), Phoenix dactylifera (date palm), Musa spp. (banana), Heliconia spp., Zingiberaceae (gingers, cardamom), and many ornamental palms and aroids.
🔄 Lifecycle
- Egg (7–10 days, on leaflet underside) → Larva (3–5 days, 6 legs) → Protonymph (3–5 days, 8 legs) → Deutonymph (3–5 days, 8 legs) → Adult (30–60 days, 8 legs).
- Multivoltine — 8–10 overlapping generations per year in tropical conditions.
📅 Season
- Active throughout the year in tropical plantations; peak activity during the dry season (December–May) when low humidity favours mite development and disfavours predatory mites and entomopathogenic fungi.
- Lowest activity during the heavy monsoon (June–September).
🔎 Appearance
- Adults are bright red mites with dark lateral spots on the dorsal surface; body is flattened and oval, with prominent body setae; legs are also red.
- Eggs are spherical, bright red, and laid in clusters on the underside of leaflets.
- Larvae and protonymphs are smaller and paler red.
- Colonies can be dense — hundreds of mites per leaflet — giving infested fronds a characteristic red dusting visible from a distance.
💥 Damage level
- Severe
🔁 Reproduction rate
- Fast
🗺️ Geographic regions
- Indian arecanut tract (Karnataka — Dakshina Kannada
- Udupi
- Shimoga
- Chikmagalur; Kerala — Kasaragod
- Kannur
- Kozhikode
- Malappuram; Assam — Karbi Anglong
- North Cachar; West Bengal — Jalpaiguri; Meghalaya). Also reported from Caribbean (Trinidad
- Jamaica
- Puerto Rico)
- Florida
- Brazil
- Venezuela
- and West Africa (Nigeria
- Ghana).
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