Mites are one of the most difficult garden pests to control. These tiny arthropods are closely related to spiders and ticks. When temperatures are high and humidity is low, mite populations grow rapidly. Since they are so tiny and difficult to see, you may not notice them until they are out of control. Sometimes miticidess are useful when these pests get out of hand. Keep reading to learn about the types of miticide available, tips for choosing a miticide and how to use miticide sprays on plants.