There have been extensive studies done on the topic already, the planet does not need mosquitos.
https://science.howstuffworks.com/science-vs-myth/what-if/what-if-mosquitoes-went-extinct.htm
https://www.nicd.ac.za/what-would-happen-if-all-the-mosquitoes-in-the-world-disappeared/
The amount of ecologically horrifying acts that our species has already done, I’d be willing to add “got rid of mosquitos” to the pile.