Which of the following arachnids are generally not considered agricultural pests in Nevada?

Spiders are not generally considered agricultural pests in Nevada because they play a beneficial role in the ecosystem. They are natural predators of many agricultural pests, including insects that can harm crops and plants. By controlling the population of these unwanted insects, spiders contribute positively to agricultural health and can help reduce the need for chemical pest control methods.

Ticks, mites, and centipedes, on the other hand, can have more direct negative impacts on agriculture. Ticks may pose health risks to livestock and humans, leading to economic losses. Mites can damage crops directly by feeding on plant tissues and can also transmit diseases. Centipedes, while primarily predatory toward insects, can sometimes also impact crop systems in ways that may be considered harmful.

In conclusion, spiders are recognized for their role in pest control and ecological balance, which distinguishes them from the other arachnids listed, making them not typically classified as agricultural pests.