Scorpions Spiders Mites and Ticks: Arachnida

Spiders help control insect pests in gardens and parks and among field crops. Some mites eat other mites and are used to control the populations of mites that harm crops. However, many ticks and mites act as parasites on people and other animals and spread diseases. Despite their reputation, only a few spiders and scorpions have venoms strong enough to harm people. The venomous bites and stings of such spiders and scorpions are dangerous to humans, especially young children, elderly persons, or people who are already in poor health.