Mosquitoes tend to be the most active in the early morning and early evening. In fact, during a warm summer night, biting females can emerge in droves. Spray the underside of bushes and shrubs in late morning. If your customer has a misting system, have it timed to spray in the early morning and late afternoon.
Populations can resurge more quickly than expected, so try to eliminate breeding areas such as standing water bird baths. For mosquito contracts, expect to visit the property at least every two to three weeks. Mosquito work can be good as an ad hoc add-on service; however, for year-long service, writing a separate service agreement is a good idea.