Mosquitoes are, at best, horrible annoyances. At worst? They are genocidal maniacs, responsible for more than half a million deaths a year, transmitting malaria and other diseases. Were causing extinction subject to popular vote, mosquitoes would win in a landslide.
All of that, relative to the moment, is the good news. Now, the bad.
Mosquitoes laugh at your so-called repellant.
Well, they don't laugh, as such, lacking the capacity for forced expulsion of air from their probosci and, likewise, any sense of humor. Point is, the most common chemical used to repel the little idiots is losing its effectiveness. From Smithsonian.com:
A group of researchers from the London School of Hygiene and Tropical Medicine discovered that three hours after an exposure to DEET, many Aedes aegypti mosquitoes were immune to the chemical, ignoring its typically noxious smell and attempting to land on irresistible human skin. …
So why did the mosquitoes, as a whole, overcome their dislike of DEET? Previous studies by this group and others have found particular mosquitoes with a genetic mutation that made them innately immune to DEET, but they say that this case is different, because they didn’t demonstrate this ability from the start.
They suspect, instead, that the insects’ antennae became less chemically sensitive to DEET over time, as evidenced by electroantennography on the mosquitoes’ odor receptors after each of the tests -- a phenomenon not unlike a person getting used to the smell of, say, the ocean or a manufacturing plant near his or her house.
In other words, all picnics should now be scheduled for two hours, 55 minutes in length.