What Are Spider Mites?

by Jack Grover
Reading time: 9 min Prefer to listen?

Spider mites are one of the most elusive, yet damaging pests that gardeners often grapple with. These tiny arachnids are known for causing extensive harm to a range of indoor and outdoor plants. If you’re curious about the nature of spider mites and looking for effective ways to control and eliminate them, read on.

Key Takeaways

  1. Spider mites are tiny, fast-breeding arachnids known for causing extensive plant damage.
  2. Signs of infestation include yellow spots on leaves, fine webbing, and damaged crops.
  3. Spider mites are difficult to eliminate, owing to their resilience and fast reproduction rate.
  4. Beneficial insects like ladybugs and lacewings can be effective in controlling spider mite populations.
  5. Implementation of natural combat techniques, including the use of neem oil, attracting beneficial insects, and pruning can be effective ways of controlling and eliminating spider mites.

Understanding the Nature of Spider Mites

Spider mites, from the family Tetranychidae, are tiny, suckling pests found commonly in North America. They can damage both indoor and outdoor plants, with greenhouses being particularly vulnerable to infestation.

These mites are not technically insects; they’re arachnids. As small as the period at the end of this sentence, spider mites are reddish-brown or pale and oval-shaped. The immature stages look very similar to adults, but they are even smaller. 

Spider mites reside in colonies, primarily on the underside of leaves. They feed by piercing leaf tissue and drawing out plant fluids. This feeding leaves light spots on the leaves which, after continued feeding, turn yellow and may drop off.

These creatures breed at a fast pace, with eggs capable of hatching in just three days. This rapid reproduction can lead to quick population growth and drastic damage before you even notice their presence. 

Spider mites thrive in hot, dry conditions, especially in environments where their natural enemies have been eradicated by insecticides. Their abundance is often indicated by fine webbing. 

They feed on a variety of host plants, including strawberries, melons, beans, tomatoes, eggplant, and ornamental flowers. Most houseplants and trees are also susceptible to attack. 

Given the destructive nature and rapid rate of infestation, conventional insecticides often prove ineffective against spider mites. Often, the best defense is to nurture natural predatory species and implement natural control methods.

Recognizing the Signs of Spider Mite Infestation

You’ll notice the signs of spider mite infestation when yellow spots appear on the leaves of your plants, accompanied by fine web-like structures.

Spider Mite Infestation


These tiny arachnids are difficult to spot with the naked eye, but their damage is unmistakable. The health of your plants is at stake, so it’s important to take action.

Here’s how:

  • Examine your plants closely: Use a magnifying glass to spot these tiny pests. Look for white specks on the undersides of leaves or assembled on stems.
  • Watch for damage: Yellow spots, leaf drops, or plant death are clear signs of spider mite infestation.
  • Check for affected crops: Annual crops like squash, melons, and watermelons are often targeted by spider mites. Loss of leaves and plant death can diminish the crop yield and cause sunburning.
  • Look for direct damage: Other crops, such as sugar peas and beans, may be directly attacked by spider mites. Any visible signs of damage on these crops can indicate an infestation.
  • Consider aesthetic distress: Spider mites can make your ornamental plants look unattractive. While they might not harm the plant much, if they overpopulate, they can actually kill the plant. 
  • Pay extra attention to roses: Spider mites are notorious pests of field-grown roses. Regular inspection can help in early detection and control of infestation. 

Difficulties in Eliminating Spider Mites

Despite your best efforts, dealing with spider mites can be tough because of their rapid reproduction, and the ineffectiveness of many common insecticides against them.

They’re resilient, resist many pesticides, and reproduce at an alarming rate. You might feel like you’re fighting an uphill battle. But don’t lose heart. You can tackle these pesky critters with a two-pronged approach. 

Let’s delve deeper into these topics in the following sections.

The Role of Beneficial Insects in Spider Mite Control

How effectively are you using beneficial insects to control your spider mite problem? If you’re not, it’s time to start. Beneficial insects are nature’s way of keeping harmful pests in check, and they’re an excellent alternative to harmful pesticides.

  • Ladybugs: These cheerful beetles are voracious predators of spider mites. They’re easy to attract, too. Plant marigolds or calendula, and they’ll come running.
  • Lacewings: Don’t let their delicate appearance fool you. Lacewings are fierce predators and their larvae have a particular appetite for spider mites.
  • Phytoseiulus Persimilis: These tiny mites are spider mite’s worst enemies. They feed exclusively on spider mites and can quickly decimate a population.

Implementing Natural Techniques to Combat Spider Mites

Using natural techniques to combat spider mites is both environmentally friendly and effective. Here are some ways to protect your plants naturally:

Use Neem Oil

Applying neem oil to your plants helps smother spider mite eggs, effectively combating the infestation. This environmentally friendly technique tackles the problem at its source, preventing the pests from multiplying further. 

Remove Lower Leaves

Make it challenging for spider mites to re-infest by removing the lower leaves of your plants. This direct tactic adds to the effectiveness of the neem oil application.

Attract Beneficial Insects

Plant flowers around your garden to attract beneficial insects. This not only adds diversity to your garden but creates an environment that’s unfavorable for spider mites.

Prune Your Plants

Take proactive steps by pruning the leaves, stems, and other infested parts of your plants. Make sure you remove and discard them well beyond the webbing. If necessary, don’t hesitate to pull entire plants to prevent the mites from spreading.

Water Plants Properly

Water-stressed plants tend to be more susceptible to mite infestations. Ensure your trees and garden plants are adequately watered to keep them healthy and resilient.

Use Horticultural Oils

Consider spot-treating heavily infested areas with insecticidal soaps or botanical insecticides. Apply horticultural oil to fruit trees early in the season or late in the fall to destroy overwintering eggs, helping to prevent future outbreaks.


So, you’ve got a handle on spider mites now. You know what they look like, how they harm your garden, and why they’re tough to eliminate.

Remember, the key is to act fast. Don’t overlook beneficial insects; they’re your secret weapon.

Use natural methods to keep these pests at bay. Your garden is a labor of love, and with these tips, you can keep it safe from these tiny invaders.

Was it helpful?

Thanks for your feedback!

You may also like

Leave a Comment

About Us

Inside The Yard is your go-to source for all things lawn and garden, offering expert advice for every corner of your outdoor space, from tractor troubleshooting to the best rose-planting tips, all wrapped up in the nation’s fastest-growing garden blog.

Latest Articles