In a room that has fleas, if nothing enters said room, how long will fleas live without blood. The room is in the temperate zone.
Although a great theory, this just does not work. Here's some interesting reading info for you:
Do NOT leave any room empty for any length of time hoping to "starve" the fleas. Flea pupae are motivated by movement and body heat. They will not hatch out if a room is void of activity. In fact, oneway of getting them to hatch out quicker than theyare inclined is the use of a vacuum. Daily vacuumingwill excite them. A vacuum with a beater-bar doesa great job of getting them to come out. An ordinaryvacuum will do well too. In bad cases, customers havesped the hatching process up by walking around in white socks. The white will reflect light and appearshot to a flea. Hot means blood and this will causethe cocoons to hatch. Immediately after walking aroundfor awhile, vacuum. The effect of vacuuming and the spray in the carpet will knockdown that many more fleaswhich will not be able to bite. Do this everyday untilyou can do so without seeing any fleas. Although thisstep may sound like a lot of work, maybe this will motivate you. FLEA COCOONS CAN LIVE OVER A FULL YEAR WAITING FOR A TARGET. Yes, a full year. This is why vacation homes that have been left vacant for 8-12 months have been found to have hundreds of fleas hatching out of the carpet when vacationers open the doors and get themselves settled. The pupae have been doing nothing but lying in wait for a target. This can happen in your home if you close a room up for a month or two expecting the fleas to simply die off. Don't waste your time waiting.
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