Why check out the local competition.......... Go one better than them. Its too easy to sit back and say that there are too many Pesties in an area i won't bother.
Market yourself correctly and the business will grow....Dont worry about who else is around you.
Establishing that there is a market for your business is the first step in any business plan
If the area is already saturated with pest controllers, it's worth considering whether it's worth investing time, money, blood sweat and tears in a business that is going to struggle.
We can only presume he has checked