Cockroaches are almost invincible and can even survive intense ionising radiation. When they are stressed, as in squashed with a broom or boot, or poison food or spray, they immediately espress eggs that later hatch into a new generation. There have been experiments where they have been deprived of food and water for many months and they still survive. As a last resort they survive by using up the energy from their brown body colour and become translucent. If they are then offered food, they only eat tiny morsels and hardly move until their colour returns. Some say that if all life is destroyed on the planet, the last to die will be the cockroach. There is an aerosol spray called BV2 that kills them quickly but they return again after the eggs hatch. There are also residual crawling insect/spider sprays that can be sprayed around the base of your house or on fences walls etc and this keeps working for up to 3 months, but new generations will keep their life cycle alive. They love sewers, so check for any possible ways that they can get out of the sewer, loose inspection covers, and air vents without screening are good places to check. Floor drains/scuppers in bathrooms, and other drains have water traps but if not used often the water can evaporate, providing the perfect path for the cockroaches to escape. Local utility providers can “smoke test” your sewers and give you a better idea where escape paths might be. Cockroaches also like warm environments and as our weather is getting warmer, (so they tell me), we have had an explosion in numbers where I live. A couple of starving chickens in the back yard might clean up some of them. Good luck with the battle.

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