One of the banes of living (or holidaying) in Italy are the mosquitoes. They arrive sometime in May (generally – this year they were a bit late as it was so cold) and keep going through until August/September.
To be honest, as the years go by, I am less affected by them than most but, still, they are a pain in the neck or wherever else they bite.
But, to know whether you should be taking a bottle of spray or 10 with you, you can check out the level of infestation here, at a site sponsored by a mosquito repellent producer.
Happy repelling