The arrival of next summer has long been the most desirable. Spring was one of the most difficult years in recent years as the coronavirus pandemic restricted the population to their homes. For this reason, now that the good weather is beginning and the Covid-19 seems to be taking a break, citizens are longing for beaches and terraces.
Flies are one of the main enemies of calm when the temperature rises : they are annoying and can irritate you. There are many tricks to get rid of these insects and one of the most classic and emblematic is hanging bags full of water. Who has never seen a sack of water on a terrace since childhood to scare the big summer flies? One way to perfect this method is to put coins in the bag.
Is it true that it is scary to just hang a transparent bag of water and some parts in the flies? pic.twitter.com/Pi7wrmVEEX
- MIRROR ™? (@ 1retrovisor) June 5, 2020
Although we can think that this is something very Spanish, the reality is that in the United States. USA There was some controversy when some urban and green institutions adopted this trick as the most efficient and cleanest way to keep flies away . For hygienic reasons, keeping them away from restaurants is mandatory as they can transmit infections and the bag trick doesn't. Is scientifically proven.
The main argument of proponents of the water bag to explain its effectiveness is that flies are scared if they are reflected in the bags and therefore flee from the place. The shape of the bag gives the reflected object a distorted look and the insect a strange feeling. The fact is that there are studies showing that flies can show permanent signs of fear and threat prevention. A group of scientists from the California Institute of Technology (Caltech) set out to scare them under different conditions and rhythms. They observed their reaction and their results and showed that the reaction of flies to a visual threat is not just that of a temporary leak, it implies a brain state similar to the fear that a person can feel.
Proponents of the water bag also argue that the fly sees its gigantic reflection and scares it as much as other objects when viewed with the light transmitted from the bag or with coins in it. Inside, they let the insect disappear at maximum speed.
The widespread use of this method has prompted the United States Department of Health and Medicine (FDA) to investigate and ultimately not validate it. A solution that requires restaurants to use others whose effectiveness has been tested.
Experienced entomologists also do not use this method, and although they recognize that seeing is one of the most developed senses of these insects, they have many doubts about the explanation that flies are afraid when they are reflected, even though they are not Have arguments that they could reject categorically . Therefore, it is better to participate in the experiment, and if you have ever hung the water bag on the roof of your terrace, the flies that once lived there will disappear.
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