Mosquito Management

From Rising Citizen


1 Introduction

This article captures the current knowledge base of everything that we know about mosquitoes and their management in the Mahadevapura (in and around Whitefield) zone.

Our fantafabulous cartoonist BG Sreedhar is the reason we tolerate so much in Whitefield. He brings humor!

2 Summary

During April 2017 and April 2019, several residential communities have reported very high number mosquitoes around the Varthur lake area. None of the fogging methods used by the communities provided any relief. Reports of swarms and entry into fully meshed homes were troubling. In the years prior numerous cases of Dengue have occured and hence we were on high alert.

So we formed a group of representatives from different areas in and around Whitefield, compared notes, discussed with entomologists, tried various relief methods and approached the government for resolutions.

Mosquitoes are mostly of the Culex variety (non dengue but not harmless either). They are definitely breeding in extreme numbers at the Hyacinth Covered Varthur Lake. The ideal way to address the situation is as follows.

  • Address the root cause ie large breeding grounds. Varthur Lake, Drains in the area. Ownesrhip squarely with the government
  • Address breeding areas in and around your communities or neighborhoods. Even small containers like coconut shells holding water will become a breeding ground for the dreaded Aedes mosquito which prefers fresh water.
  • Thermal Fogging has been proven completely ineffective. It takes us to "hazardous" levels of air quality while pumping in chemicals. The whole time, it does not provide any material relief to people. See survey below.
  • Cold Fogging keeps two of the three problems of thermal fogging and is thus ineffective
  • Certain industrial strength traps have been found to be effective in some areas. Ideal for a community. Key is to find the right "location" for the trap.
  • Many measures available at a personal level. Detailed below. A combination of them should work out for most people.

Worst affected will be those in the open, on the roads etc with no protection. It is therefore urgent and imperative that the government address this situation asap.

To date, we have done the below in an effort to persuade the govt to resolve this situation

  • Pressed on the urgency for Varthur Lake Deweeding and aeration with KLDCA, Bangalore Development Minister and the Health dept. Formal complaints submitted
  • Created awareness via print and social media
  • Providing solutions beyond what is typical for the govt - ie fog and spray the area to reduce the mosquitoes. These are extremely temporary and cause more harm than benefit.

3 High Number of Mosquitoes

Following images show the heap of mosquitos collected by different communities on a daily basis. Two species of mosquitoes are present.

Culex mosquito species are present in huge numbers:

Culex Female Mosquito

Dengue causing Aedes Aegypti are also present in smaller numbers:

Aedes Aegypti Mosquito

3.1 Mosquitoes captured by Artic Mosquito Killing System (Outdoor unit)

Large numbers of mosquitoes captured by the Artic Mosquito Killing System

3.2 Mosquitoes killed by using HIT spray

Mosquitoes killed using the HIT spray

3.3 Mosquitoes killed by previous day fogging

Mosquitoes killed by fogging done previous day

4 Varathur Lake as a source of breeding ground of mosquitoes

Varathur lake is a shallow lake and 50% of it water surface covered with hyacinths.

Hyacinths covering more than 50% of the lake

With a maximum depth of 6 feet and an average depth of 3 feet, Varathur lake is a shallow lake.

Contour map of Varathur lake. Average depth of 3 feet!

Hoodi and Sadaramangala lakes are deeper, have fewer hyacinths, and have reportedly lower number of mosquitoes.

4.1 Mosquito indoor trap units closer to Varathur lake capture 10x more mosquitoes

The number of mosquitoes captured by an equivalent indoor unit near (< 1 Km) Varathur lake is 10 times of what was caught in a house that 5 Km away. The closer indoor unit collected 50 mosquitoes per day, whereas the farther unit collected 50 mosquitoes in one week.

4.2 Mosquito larvae and pupae are present in Varathur lake in large numbers

Mosquito Larvae in Varathur Lake.jpg
Mosquito larvae (vertically positioned) and pupae (horizontally positioned) in the lake water.

4.3 Newspaper articles and scholarly articles confirm hyacinths in the lake as a major breeding ground for mosquitoes

  1. http://www.deccanchronicle.com/140408/nation-current-affairs/article/hyacinth-breeding-mosquitoes
  2. http://www.thehindu.com/news/cities/Madurai/Water-hyacinth-in-Vaigai-river-breeds-mosquitoes/article16172733.ece
  3. https://www.ncbi.nlm.nih.gov/pubmed?db=pubmed&cmd=Link&LinkName=pubmed_pubmed&from_uid=13732158

5 Fogging as a method to control mosquitoes have become ineffective

5.1 Data from 40 communities show that fogging does not control mosquitoes

The following table shows that fogging as a method to control mosquitoes have become ineffective.

S.No Community Name Type Method Vendor Relief Comments
1 Asset Gardenia Residential Fogging No Relief Unbelievable number of mosquitoes inside and outside the house
2 Sigma Tech Park Varthur     Office Fogging No Relief Mosquitoes like a wall on the glass entry doors
3 Divyashree Tech Park  Office Fogging No Relief Mosquito menace drastically gone up and evenings all the lifts are filled with mosquito's
4 Waterville     Residential Fogging No Relief
5 Waterwoods  Residential Fogging No Relief
6 Skylark Greens Residential Fogging No Relief
7 Vijaysri Elixir     Residential Fogging No Relief
8 SLS Square EPIP Zone     Residential Fogging No Relief
9 Balaji Prestine Residential Fogging No Relief
10 Adarsh Palm Retreat  Residential Fogging No Relief
11 Pride Orchid Residential Chemical spray No Relief
12 DNR Apartments  Residential Fogging No Relief
13 Saroj Symphony     Residential Fogging No Relief
14 Srimitras Landmark  Residential Fogging No Relief
15 GCN white palms  Residential Fogging No Relief
16 Sahyadri luxury homes     Residential Fogging No Relief
17 Renaissance Jagriti  Residential Fogging No Relief
18 Knights bridge apartments     Residential Fogging No Relief
19 Hinduja Park  Residential Fogging No Relief
20 Trifecta Sollievo Residential Fogging No Relief
21 Gayathri Goodlife Apartment     Residential Fogging No Relief
22 Amara Courtyard      Residential Fogging No Relief
23 Amrutha Sarovar Belthur  Residential Fogging No Relief
24 Srimitras Landmark     Residential Fogging No Relief
25 DNA Eden View     Residential Fogging No Relief
26 Rosedale   Residential Fogging No Relief
27 Shraddha splendor  Residential Fogging No Relief
28 Sonestaa Meadows  Residential Fogging No Relief
29 Shriram Samruddhi Apartments  Residential Fogging No Relief
29 Zonasha Paradiso     Residential Fogging No Relief
30 Citilights Rustique     Residential Fogging No Relief
31 Charitha Classic     Residential Fogging No Relief
32 Sumadhura Anandam  Residential Fogging No Relief
33 Prestige Ozone     Residential Fogging No Relief
34 Tzed     Residential Herbal Spray Osolin No Relief
35 Laughing Waters      Residential Fogging No Relief
36 Shobha Malachite      Residential Fogging No Relief
37 Palm Meadows      Residential Fogging No Relief
38 Asset Gardenia      Residential Fogging No Relief
39 Sumadhura Sawan      Residential Fogging No Relief
40 Chaitanya Samarpan      Residential Outdoor Mosquito Trap Alpha Moscon Relief
41 Chaitanya Smaran      Residential Fogging No Relief

5.2 Hazardous level air pollution reported due to fogging

Fogging and Pollution.png


Very high levels of Air Quality Index (AQI) has been reported. Learn more about AQI at: https://en.wikipedia.org/wiki/Air_quality_index#United_States

5.3 Harmful chemicals (neurotoxin) like Delatmethirin are used in fogging

Since deltamethrin is a neurotoxin, it temporarily attacks the nervous system of any animal with which it comes into contact. Skin contact can lead to tingling or reddening of the skin local to the application. If taken in through the eyes or mouth, a common symptom is facial paraesthesia, which can feel like many different abnormal sensations, including burning, partial numbness, "pins and needles", skin crawling, etc. There are no reports indicating that chronic intoxication from pyrethroid insecticides causes motor neuron damage or motor neuron disease.

http://npic.orst.edu/factsheets/DeltaGen.pdf

6 Solutions that have been confirmed to work

6.1 Removal of hyacinths from the lake

Newspaper articles and scholarly articles have confirmed that removing hyacinths from the lake and killing the larvae is a very effective method to prevent mosquito breeding.

6.2 Outdoor mosquito traps

  1. Mosquito killing system: http://www.alphamoscon.in/
  2. Mozzzart trap: http://www.dolphinfloats.co.in/mosquito-killing-system.html

6.2.1 CO2 level emitted by these devices are at safe level and is equivalent to two adults breathing

These devices come with carbon dioxide cylinder that releases CO2 mimicking a human. There are concerns about the amount of CO2 emitted and the impact.

The traps (large ones) are estimated to emit CO2 at the approximate hourly rate of 50-60 grams per hour. An average human exhales at the rate of 30-40 grams of CO2 an hour, depending on level of activity etc. An average passenger vehicle emits CO2 at the rate of 400 grams of CO2 per just one mile leave alone the other harmful gas emissions (carbon monoxide, methane, nitrous oxide, sulphur dioxide and hazardous air pollutants or toxics) from the tailpipe. CO2 is constantly wafted away in the breeze. If it was so dangerous animals would not survive nights in forests. CO2 is commercially produced and bottled by separating and liquefying it from gases generated from burning fuels in thermal power plants, production of beer, etc. In other words, the CO2 released from mosquito traps is not a net addition to the atmosphere.

6.3 Indoor mosquito traps

Violeds MOSCLEAN UV LED Electric Mosquito: https://www.amazon.in/gp/product/B07K2Y479G/

6.4 Mosquito insect screens on doors and windows

  1. Delmen Mosquito Screens: http://www.delmennets.com/
  2. Window Insect Mosquito Mesh Net Screen: https://www.amazon.in/gp/product/B07GZSW3P1

6.5 Mosquito bats

Using a fully charged mosquito bat can kill the mosquitoes very effectively. Mosquito bats with low charge only stuns them. You need to crush the mosquitoes to their death. Rechargeable Mosquito Bat: https://www.amazon.in/gp/product/B075LHZFP4

6.6 Mosquito nets for beds

Classic Mosquito Net Foldable: https://www.amazon.in/gp/product/B014T5Q0XW

7 Action History

S.No Action Owner Action Committed Date Date/Status
1 Remove hyacinths from the Varathur Lake Mr. Uday Kumar (Corporator Hagadur Ward) 18-April-2017 May-12-2017/ Hyacinths are being removed from the lake.
Hyacinths are being removed using Coracles.jpg