Post on 25-Jul-2020
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Stalking Mosquitoes
By Zane McCallister
Grand River Mosquito Control District
Email: grmcd1@acsol.net
970-257-0191
Site AnnoyancePotential
Topics of Discussion
� Pareto Principle� Mosquito Control� Mosquito Control Dilemma� Site Annoyance Potential� Discussion
� Vilfredo Pareto� French-Italian
sociologist, philosopher and economist
� Studied distribution of wealth in 1897
� Recognized that 80% of wealth was held by 20% of population
The Pareto Principle Pareto Principle Incognito
� The 80 – 20 Rule
� Factor Scarcity Rule
� Law of the Vital Few20%20% 80%80%
Customers Profits
Carpet Wear
Motorists Accidents
Thieves Loot
Students Disciplinary Problems
Clothes Wear
Expenses Cash
Jockeys Races
Time Productivity
Contrary to Popular Beliefs
There is an imbalance between effort and reward
Pareto and Pest Control?
� Case Study of how it might apply to mosquito control.
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Mosquito Control
� Objective� To limit the number of mosquitoes that have the
opportunity to feed on constituents.
� To limit the environmental impact of efforts.
Mosquitoes
� Mosquitoes are Dipterans� Two wings
� Complete metamorphosis� Must complete life cycle in
water
� Water must be stagnant� 32% of their lives is spent in
water
Mosquito Variation
� Over 3000 species� 26 known in Valley
� 13 common in Valley
� 2 important genera� Permanent water
� Flood borne
Mosquito Habitat
� Flood borne� Agricultural flood plains
� Colorado River flood plains
� Permanent water source� Pools
� Lakes
� Storm drains
The GRMCD
� A program based on larval control requires:� Regular inspection of
each breeding site
� Treatments to water sources that contain mosquitoes
� Record keeping
� Consistency
The Control Dilemma
� Time consuming� Visiting 1,680 sites each week
� Labor intensive ($)� Sites are remotely located
� Must be monitored by people
� Seasonal workforce� Train new each year
� No knowledge carried yr to yr
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Breaking It Down
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73 Sq. miles46,514 acres
8 Employee5,814 acres each
6 Day Rotation 969 acres / day
35 stagnant water sources / day
The Solution
� Narrow focus by one more factor
� Prioritized daily task list
� Empower employee with knowledge
The Fifth Factor: S.A.P.
� Narrow focus by one more factor
� Prioritized daily task list
� Empower employee with knowledge (which site is most important?)
Site Annoyance Potential
Broods per Year Average Larvae per Dip
Size of Site (acres) Distance from the Edge of the District
S.A.P.
Size Matters
� Not all mosquito breeding sites are created equal (How Big is the site?)
Broods Per Year
� How often will mosquitoes be produced at this site?� One and done (flood plain)
� Early and often (Flood plain turned permanent)
� Steady and reliable (Permanent)
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Larvae Per Dip
� What is a dip?...
The mosquito hunters acceptable unit of measure
Distance
� How far is the site from the edge of the control area?� Distance to the edge
of district
� Equation applied using Sjogren and Genereux (1987)
Flight Capabilities
� Edge of the district -50% chance
� Middle of the district -100% chance
� Corner of the district -25% chance
Generic district boundaries
Data Collection
� The data collection tool� Broods per year
� Larvae per dip
� Size of the site
Data
� The breadth and scope of the data� How many years
� How many times per year
� The more the merrier
Results
Site Identification
Average Larvae per dip
Broods per year
Size Distancefrom edge
S.A.P.
1.1.10 5.71 7 2.0975 0.76 = 63.764
1.1.6 5.88 7 1.6011 0.76 = 50.042
1.1.25 8.33 6 0.8759 0.76 = 33.284
1.1.35 13.00 2 1.6609 0.76 = 32.819
1.1.26 4.57 7 1.2541 0.76 = 30.499
� This is what the results might look like after being compiled
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Results
Site Identification
Average Larvaeper dip
Broods per year
Size Distance from edge
S.A.P.
3.2.16 13.17 6 16.0554 0.76 = 963.969
3.2.10 6.60 5 6.5785 0.76 = 164.990
3.2.13 6.50 2 2.5569 0.76 = 25.262
3.2.18 5.00 1 2.5088 0.76 = 9.534
3.2.1 5.00 2 1.2455 0.76 = 9.466
� Same ‘chart’ Different day
Using S.A.P.
� Arm employees with this knowledge� Allow field techs to
make on the ground decisions
� Cover the day within the SAP framework
Using SAP
� 75 square miles� 8 full time employees
� 6 day rotation� 30-40 sites per day
� Prioritized daily task list (based on S.A.P.)
General Pest Control
� Use data that you already have, to prioritize what matters most.
� Personalize S.A.P. to your meet your organizations needs or goals.
S.A.P.
The End