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Eonomical Heat Treatment for Bedbugs. Philip G. Koehler, Roberto Pereira, and Margie Pfiester Urban Entomology Building 352-392-2484 [email protected] Thermal Death Point for Bed Bugs. 111-113 degrees Fahrenheit 44-45 degrees Celsius. Killing Bed Bugs Bed bugs at least 113 F.

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Eonomical heat treatment for bedbugs

Eonomical Heat Treatment for Bedbugs

Philip G. Koehler, Roberto Pereira, and Margie Pfiester

Urban Entomology Building

352-392-2484

[email protected]


Thermal death point for bed bugs
Thermal Death Point for Bed Bugs

  • 111-113 degrees Fahrenheit

  • 44-45 degrees Celsius


Killing bed bugs bed bugs at least 113 f
Killing Bed BugsBed bugs at least 113 F


Commercial heat treatment
Commercial Heat Treatment

  • Heat whole room or whole structure

  • Expensive equipment

    • $20,000-$50,000

  • Lengthy procedure

  • No residual effect

  • Very visible




Effect of high temperatures on bed bugs
Effect of High Temperatures on Bed Bugs

  • Expose bed bugs to high temperatures in a water bath

    • 2 bugs per tube

    • Temperatures of 103-120F

    • Exposures of 0.5-240 min

  • Record bed bug mortality

    • 1 min later

    • 24 h later


How long does it take to kill bed bugs with heat
How long does it take to kill bed bugs with heat?

109oF

113oF

106oF

117oF

120oF

2 min

4 min

25 min

1 min

100 min

Minutes to 100% Mortality


Rise in temperature of 7 degrees f decreases time to kill by10 times

Thermal Death Time Curve

Rise in Temperature of 7 degrees F decreases time to kill by10 times


Summary of lab studies
Summary of Lab Studies

  • Temperatures above 106 F kill bed bugs

  • An increase of 7 F reduces time to kill by 10 times

    • >100 min at 106 F

    • 10 min at 113 F

    • 1 min at 120 F

  • Heat is the “Achilles heel” for bed bugs


First attempt at heat treatment
First attempt at heat treatment

2 heaters

Space heater

6 mil poly sheeting

Oscillating fan


First attempt at heat treatment polyethylene
First attempt at heat treatment Polyethylene

6 mil poly sheeting

2 space heaters


First attempt at heat treatment polyethylene1
First attempt at heat treatmentPolyethylene

  • Too much heat loss with Polyethylene sheeting

106.3 F

105.6 F

Started: 9 AM

Ended: 4 PM

F

F

F

69.8

82.2

100.2

106.7


Second attempt at heat treatment
Second attempt at heat treatment

Poly sheeting covered

with blankets

4 heaters and fans


Second attempt at heat treatment blankets
Second attempt at heat treatmentBlankets

108.7 F

111.2 F

Started: 9:30 AM

Ended: 3:07 PM

F

F

F

75.4

84.9

125.2

131

69.8

82.2

100.2

106.7



Third attempt at heat treatment styrofoam heat chamber
Third Attempt at Heat TreatmentStyrofoam Heat Chamber

Carpeted floor


Third attempt at heat treatment styrofoam heat chamber1
Third Attempt at Heat TreatmentStyrofoam Heat Chamber

Under pillow

Under mattress

113.4 F

141 F

Started: 9:00 AM

Ended: 11:20 PM

F

F

F

73.2

80.1

112

141.4

69.8

82.2

100.2

106.7


Fourth attempt at heat treatment styrofoam heat chamber
Fourth Attempt at Heat TreatmentStyrofoam Heat Chamber

Fans/Heaters poorly placed

Tile floor

F

F

F

79.8

100.5

131.7

69.8

82.2

100.2

106.7


Summary of field tests
Summary of Field Tests

  • Space heaters can heat up to 140-150 F

    • Oil-filled eliminates chance of fire

  • Styrofoam heat box contains heat better than plastic or blankets

    • 2 inch thick styrofoam

  • Tile/Concrete floors need to be insulated

    • Carpet padding or foam play pads

  • Circulation of heat is important

    • Fan & heater placement at opposite corners


Equipment for heat treatment
Equipment for Heat Treatment

6 polystyrene sheets

2 heaters

2 box fans

1 oscillating fan

Extension cords

and power strip


Insulation for floors tile terrazo concrete
Insulation for Floors: Tile/Terrazo/Concrete

Interlocking foam play pads

Carpet remnants


Temperature monitoring
Temperature Monitoring

Thermometers

Data Loggers


Equipment
Equipment

  • 2 Space heaters

    • $99.90


Equipment1
Equipment

  • 6 Polystyrene sheets (4 by 8 ft)

    • $137.76


Equipment2
Equipment

  • 2 Box fans

    • $27.34


Equipment3
Equipment

  • 1 Oscillating fan

    • $29.95


Equipment4
Equipment

  • 2 Thermometers

    • $17.94


Equipment costs 312 89
Equipment Costs$312.89

  • 2 Space heaters

  • 6 Polystyrene sheets

  • 2 Box fans

  • 1 Oscillating fan

  • 2 Thermometers

  • 2 Extension cords; power strip

  • Duct or packing tape


Set up of heat chamber for bed bug control
Set-up of heat chamber for bed bug control

Foam insulation

Heater

Fan

Bed

Fan

Heater

Foam insulation


Power considerations one circuit for each fan and heater
Power ConsiderationsOne circuit for each fan and heater

  • Heater

    • Draws ~12 amps

  • Fan

    • Draws ~3 amps

  • Total

    • ~15 amps

20 amp circuit breakers



Important points for heat treatment
Important Points for Heat Treatment

  • Check amperage of outlets

    • Plug heaters into 2 separate circuits

  • Position of thermometers is important

    • Place where heat will take longest to get hot

    • Like cooking a turkey

  • Heat containment/circulation is important

    • Like a convection oven

    • Floor & box insulation

    • Fans to create most turbulence

  • Treat room with residual product



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