Indian Varroa Mite
Varroa destructor Anderson & Trueman (on Apis cerana indica)
📖 Description
Indian Varroa Mite (Varroa destructor on Apis cerana indica and Apis mellifera) is the most serious pest of managed honey bee colonies across the Indian subcontinent and worldwide. Originally a parasite of Apis cerana (Eastern honey bee — including Indian Apis cerana indica) in East Asia, the mite switched to Apis mellifera (European honey bee) in the mid-20th century and has since spread worldwide. India has over 12 lakh bee colonies producing over 95,000 tonnes of honey annually, with major beekeeping belts in Punjab, Haryana, Uttar Pradesh, Bihar, West Bengal, Maharashtra, Tamil Nadu, Kerala, Karnataka, and the Northeast. The pest is unusual among apicultural pests because (a) it is an ectoparasitic mite — adult females attach to adult bees (phoretic stage) and feed on haemolymph (bee blood), and enter sealed brood cells to reproduce (reproductive stage), (b) a single female mite enters a brood cell just before it is capped, lays 5-6 eggs, and the offspring mate inside the cell — daughter mites emerge with the adult bee and seek new cells, (c) the mite is the most important vector of bee viruses — including Deformed Wing Virus (DWV), Kashmir Bee Virus (KBV), Acute Bee Paralysis Virus (ABPV), and Israeli Acute Paralysis Virus (IAPV) — these viruses cause far more damage than the mite itself, (d) Varroa has developed resistance to most synthetic acaricides (fluvalinate, coumaphos) in many parts of the world due to overuse, making treatment increasingly difficult, (e) Apis cerana indica (the native Indian hive bee) has natural resistance through grooming behaviour (mites are detected and bitten by worker bees) and brood removal (Varroa-infested pupae are detected and removed by hygienic bees) — co-evolution with Varroa has produced effective defence mechanisms, while Apis mellifera lacks these defence mechanisms and is highly susceptible, (f) untreated Apis mellifera colonies typically die within 1-2 years — making Varroa management the single most critical intervention for Apis mellifera beekeepers, and (g) the mite has caused massive colony losses worldwide — in some regions over 90% of feral Apis mellifera colonies have died. IPM with Varroa-resistant Apis mellifera stocks (VSH lines, Russian bees), monthly mite monitoring (sugar shake or sticky board), threshold-based treatment, oxalic acid sublimation in broodless periods, formic acid for mites inside cells, Apivar (amitraz) for moderate infestations, Apiguard (thymol) as organic option, drone brood trapping, brood break methods, screened bottom boards, good nutrition, and apiary biosecurity provides effective control. The pest is a particular concern for Indian beekeepers because (i) India is a major honey-producing nation with rapidly growing commercial apiculture, (ii) much Indian beekeeping uses Apis mellifera (for higher honey yields) which is highly susceptible to Varroa, (iii) Apis cerana indica has natural Varroa resistance but produces less honey — many beekeepers are switching to Apis mellifera for economic reasons, (iv) Varroa has been detected in Indian Apis mellifera colonies and is spreading — India’s growing commercial beekeeping industry is at risk, (v) many Indian beekeepers have limited access to IPM knowledge, monitoring tools, and effective treatments, and (vi) the mite-vectored viruses (especially DWV) can cause colony collapse even when mite populations are controlled.
⚠️ Symptoms to watch for
- Direct damage: adult bees with deformed wings (wrinkled, stunted), shortened abdomens, missing legs, parasitic mite syndrome (PMS) — brood pattern becomes spotty, larvae die and turn brown, pupae die with protruding tongue, adult bees appear greasy and dark, rapid colony decline and death within 6-24 months without treatment. Virus transmission (most serious consequence): DWV causes wing deformity and reduced lifespan, KBV and IAPV cause rapid colony collapse, Sacbrood Virus causes brood mortality. Colony collapse disorder-like symptoms. Economic loss: 100% colony mortality within 1-2 years in untreated Apis mellifera colonies; Apis cerana indica has some natural resistance through grooming behaviour and brood removal but can also suffer losses.
🩹 Treatment
- Monitor mite populations using sugar shake test (coat 300 bees in powdered sugar, mites dislodge and count) or sticky bottom boards (count natural mite fall per day), treat when mite levels exceed 3 mites per 100 bees (sugar shake) or 10 mites per day on sticky board, use Apiguard (thymol-based) @ 50 g per brood chamber twice at 14-day intervals (organic — effective at temperatures above 15°C), use Apistan (fluvalinate) strips @ 2 strips per brood chamber for 6-8 weeks (synthetic — rotate with other treatments to slow resistance), use Bayvarol (flumethrin) strips @ 4 strips per brood chamber for 6 weeks, use Apivar (amitraz) strips @ 2 strips per brood chamber for 6-10 weeks (highly effective — rotate to slow resistance)
🌿 Organic treatments
- Apiguard (thymol gel) @ 50 g per brood chamber twice at 14-day intervals (effective at temperatures 15-30°C — avoid in extreme heat), ApiLife VAR (thymol + eucalyptol + menthol) @ 1 wafer per brood chamber for 7-10 days, oxalic acid sublimation @ 2-3 g per brood chamber via vaporiser (highly effective against phoretic mites — use in broodless period or winter), formic acid 65% @ 30-60 ml per brood chamber via slow-release pad (kills mites inside sealed brood cells — only treatment that does so — but temperature-sensitive, can harm brood above 30°C), lactic acid 15% spray @ 5 ml per comb side (use in broodless period), powdered sugar dusting @ 30-50 g per colony weekly (encourages grooming — reduces phoretic mites but not mites in cells), use screened bottom boards without sticky board (mites that fall off bees cannot climb back), essential oil blends (spearmint, lemongrass, thyme) — variable efficacy, drone brood trapping (remove and freeze drone comb — Varroa prefer drone cells) — effective cultural control.
🧪 Chemical treatments
- Apistan (tau-fluvalinate) strips @ 2 strips per brood chamber for 6-8 weeks (synthetic pyrethroid — rotate with other modes of action), Bayvarol (flumethrin) strips @ 4 strips per brood chamber for 6 weeks, Apivar (amitraz) strips @ 2 strips per brood chamber for 6-10 weeks (highly effective — most widely used synthetic in India), Coumaphos (CheckMite+) strips — restricted use, rotate modes of action annually to slow resistance development (Varroa has developed resistance to fluvalinate and coumaphos in many parts of the world), NEVER treat during honey flow — residues contaminate honey, observe withholding period before harvest. Note that no chemical treatment kills 100% of mites — combine with biotechnical methods (drone brood trapping, brood break) for best results.
🛡️ Prevention
- Use Apis cerana indica (Indian hive bee — has natural Varroa resistance through grooming behaviour and brood removal — Varroa co-evolved with Apis cerana and the bee has defence mechanisms) rather than Apis mellifera where possible (in traditional and small-scale beekeeping), breed Varroa-resistant Apis mellifera stocks (Varroa Sensitive Hygiene VSH lines, Russian bees, Survivor stocks — selectively bred for hygienic behaviour that detects and removes Varroa-infested pupae), practice strict apiary biosecurity (do not import bees or used equipment from Varroa-infested areas without treatment), monitor mite populations monthly using sugar shake or sticky board (treat early before populations explode), use small cell comb (4.9 mm cell size instead of standard 5.4 mm — reduces Varroa reproduction, controversial but some beekeepers report benefit), use screened bottom boards without sticky board (fallen mites cannot climb back), practice drone brood trapping (remove and freeze drone comb every 21 days — Varroa prefer drone cells and trapping removes mites from colony), use brood break methods (cage queen for 12 days — breaks Varroa reproductive cycle as no brood cells available), practice good nutrition (strong colonies better resist mite-vectored viruses), avoid robbing by managing hive entrances during dearth (robbing spreads mites between colonies), requeen colonies annually with hygienic queens, avoid mixing colonies from different apiaries, treat all colonies in an apiary simultaneously (prevents re-infestation from untreated colonies).
🪴 Affected plants
- Honey bee colonies (Apis cerana indica — Indian hive bee, native host; Apis mellifera — European honey bee, highly susceptible). Not a plant pest — an apicultural ectoparasitic mite of honey bees. Also vectors bee viruses including Deformed Wing Virus (DWV), Kashmir Bee Virus (KBV), Acute Bee Paralysis Virus (ABPV), and Israeli Acute Paralysis Virus (IAPV).
🦋 Natural predators
- Worker bees themselves (grooming behaviour — Apis cerana indica is naturally resistant; VSH-bred Apis mellifera lines can detect and remove Varroa-infested pupae). No commercially available biological control agents are effective against Varroa inside bee colonies. Pseudoscorpions (Chelifer cancroides) and predatory mites (Stratiolaelaps spp.) have been investigated as biocontrol agents with limited success.
🌱 Host plants
- Honey bee colonies (Apis cerana indica — Indian hive bee, natural host; Apis mellifera — European honey bee, highly susceptible). Not a plant pest.
🔄 Lifecycle
- Adult female mite attaches to adult bee (phoretic stage) and feeds on haemolymph for 5-10 days.
- Female mite enters a brood cell just before it is capped (prefers drone cells — longer development time allows more mite offspring).
- Inside capped cell, female lays 5-6 eggs over 6 days.
- Eggs hatch into larvae which moult into protonymphs then deutonymphs.
- Mating occurs inside the cell between brother and sister mites.
- When adult bee emerges from cell, 1-3 daughter mites (already mated) emerge with her and seek new cells.
- Phoretic female lifespan 2-6 months in winter, 1-2 months in summer.
- Reproductive female can complete 3-7 reproductive cycles in her lifetime.
- Total development from egg to adult 6-8 days inside capped cell.
- Year-round reproduction in tropical India (no brood break), allowing rapid population buildup.
📅 Season
- Year-round in tropical India; peaks Mar-Jun (spring build-up when brood rearing is maximum and mites can reproduce rapidly) and Sep-Nov (post-monsoon second brood build-up).
- Mite populations typically peak just before colony collapse — monitor carefully during these periods.
🔎 Appearance
- Adult female is a broad, flattened, reddish-brown, shield-shaped ectoparasitic mite (family Varroidae); body wider than long with tough leathery cuticle; 8 legs (larvae have 6); mouthparts modified for piercing bee cuticle and feeding on haemolymph.
- Males are smaller, white, and die after mating inside the brood cell.
- Distinct from other mites by large size (visible to naked eye), reddish-brown colour, and shield shape.
- Mites attach to adult bees (phoretic stage) or live inside sealed brood cells (reproductive stage).
💥 Damage level
- Moderate
🔁 Reproduction rate
- Fast
🗺️ Geographic regions
- Indian Subcontinent
- South Asia
- Southeast Asia
- East Asia (origin)
- Cosmopolitan Worldwide (except Australia which remains Varroa-free as of 2024 except recent incursion)
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