India's Vector-Borne Disease Burden
India is endemic for multiple vector-borne diseases transmitted by mosquitoes:
- Dengue: Aedes aegypti and Aedes albopictus mosquitoes. Urban and peri-urban. 100,000–300,000 confirmed cases annually; significant underreporting. Peak season: monsoon and post-monsoon (July–November).
- Malaria: Anopheles mosquitoes. Rural and forested areas primarily. ~200,000 cases annually. Significant in Odisha, Chhattisgarh, Jharkhand, Madhya Pradesh, and northeastern states.
- Chikungunya: Aedes mosquitoes. Periodic outbreaks in urban areas. Shares Aedes vector with dengue — same control measures apply.
- Japanese Encephalitis (JE): Culex mosquitoes. Rural areas near pig farming. Primarily in UP, Bihar, West Bengal.
India's National Vector Control Programme
The National Centre for Vector Borne Diseases Control (NCVBDC), under the Ministry of Health and Family Welfare, coordinates vector control across states. The programme mandates integrated vector management (IVM) combining:
- Source reduction: Eliminating breeding sites — clearing stagnant water, covering tanks, cleaning drains.
- Anti-larval operations: Applying biological (Bacillus thuringiensis israelensis, Bti) or chemical (temephos) larvicide to water bodies.
- Adult control: Thermal fogging and indoor residual spraying (IRS) to kill adult mosquitoes.
How Municipal Fogging Operations Work
Municipal corporations conduct scheduled fogging drives, especially during monsoon season. The operation involves:
Timing and Frequency
- Peak season: July to October (post-monsoon through Diwali). Daily or every-other-day in high-risk wards.
- Off-season: Weekly or monthly scheduled drives.
- Emergency response: Daily fogging when dengue/malaria cases spike in a ward.
- Best time: Dawn (6–8 AM) or dusk (6–8 PM) when Aedes mosquitoes are active and wind is minimal.
Vehicle-Mounted Fogger Operations
The standard municipal fogging operation uses a vehicle-mounted thermal fogger:
- A vehicle (pickup truck or smaller utility vehicle) with a mounted fogger drives slowly through residential streets.
- The fogger's swivel nozzle directs fog on both sides of the vehicle, covering a 10–15 meter swath.
- A 20–50 liter insecticide tank allows continuous operation for 1–2 hours.
- Ward supervisors map routes to ensure complete coverage of at-risk zones.
Insecticides Used for Fogging in India
| Active Ingredient | Concentration | Target |
|---|---|---|
| Deltamethrin (pyrethroid) | 1.25% in oil | Aedes, Culex, Anopheles |
| Malathion (organophosphate) | 96% technical in carrier oil | All adult mosquitoes |
| Cypermethrin (pyrethroid) | 10% in oil | Aedes, Culex |
| Permethrin (pyrethroid) | 50% in oil | Broad-spectrum |
The WHO recommends pyrethroid-based formulations for dengue vector control due to lower mammalian toxicity. Health departments specify the active ingredient and concentration in procurement tender documents.
Procurement: How Municipal Corporations Buy Fogging Machines
Municipal corporations procure fogging machines through:
- GeM (Government e-Marketplace): Direct purchase from MSME OEM sellers without separate tender. Fast, transparent, competitive pricing.
- Open tenders / L1 procurement: For larger quantities, tenders specify technical requirements (output capacity, tank size, fog distance) and required certifications (ISO 9001, ISI, CE).
- State government framework contracts: Some states have rate contracts for fogging equipment that districts/municipalities draw from.
100X Circle is a GeM-listed MSME OEM, meaning municipal corporations can procure directly without the full tender process for eligible amounts.
Frequently Asked Questions
How do municipal corporations in India control mosquitoes?
Three-pronged approach: (1) thermal fogging — vehicle-mounted foggers driven through residential streets at dawn/dusk; (2) anti-larval operations — larvicide in stagnant water; (3) source reduction — drain clearing and garbage management. Fogging is used for emergency outbreak response and scheduled monsoon drives.
What fogging machines do Indian municipalities use?
Vehicle-mounted pulse-jet thermal fogging machines are standard. The vehicle is driven slowly through streets while the fogger discharges insecticide fog. Domestic Indian OEM suppliers like 100X Circle (GeM-listed) and imported Korean/German brands are used.
When is thermal fogging done for mosquito control?
Dawn (6–8 AM) or dusk (6–8 PM) when Aedes mosquitoes are active and air movement is minimal. Daily during monsoon season in high-risk wards. Fogging in midday heat or strong wind is less effective.
Which insecticide is used for mosquito fogging in India?
Deltamethrin 1.25% in carrier oil is most common for dengue/chikungunya (Aedes control). Malathion in carrier oil is used for broader programmes. All must be oil-based formulations for thermal foggers.