Live rat sightings are a sure sign that an infestation is in progress, but may not occur until an infestation has become severe. Instead, be alert for the signs of rodent infestation. Addressing infestations early will save you time, money, and effort.
The US Environmental Protection Agency has a wealth of information on integrated pest management for schools. You can access this information, including webinars and other training information, on their website at www.epa.gov.
For information on preventing mosquitoes on farms and ranches, please consult Managing Mosquitoes on the Farm (a publication of the University of California Division of Agriculture and Natural Resources).