Spider Mites – Tiny Bugs That Cause Big Problems

Spider MitesSpider mites are a common enemy of anyone who cares about their landscape plants. Classified as arachnids, these tiny bugs are less than 1/20 inch long when fully mature and look like moving dots to the naked eye. Despite their size, our arborists warn that mites will start being a huge problem for homeowners in the next few weeks. Their ability to rapidly reproduce allows large populations to develop fast and severely harm your plants before you even realize you have a problem. Learn what the signs of spider mites look like, what plants they attack, when they appear, and how to keep them from destroying your property’s landscape.

When to Keep an Eye Out:

Spider mites reproduce rapidly in hot weather. In our area, we typically see a lot of mite activity from June through September.

Susceptible Trees/Shrubs

Spider mites prefer hot, dusty conditions. Plants that are not watered enough and are experiencing drought stress are most susceptible. In addition, our arborists commonly see these mites on junipers, Boxwoods, Cryptomeria, Arborvitae, and Leyland Cypress’.

Once one plant is infected, mites can spread throughout your landscape without difficulty. In fact, they use the wind and their webbing to easily sail from one plant to another.

Spider Mite Damage

Spider mites cause damage by sucking cell contents from the leaves. You most likely will not notice anything odd when mites are at low populations; however, when they continue to grow to a high population you will start seeing the damage. Injury from spider mites can lead to the death of your plants.

  • Stippling of light dots on leaves/needles
  • Leaves/needles turning yellow or reddish
  • Leaves/needles dropping off
  • Webbing covering leaves/needles and twigs
  • Tiny moving dots on underside of leaves/needles (what these mites look like to the naked eye)
Spider Mite Damage

Webbing From Spider Mites

Webbing From Spider Mites

spider mite damage

Getting Rid Of Spider Mites

When it comes to spider mites you have a couple options. Discuss with you Arborist which approach is best for you and your property.

Organic Control Through Beneficial Insects:

Spider mites have many natural enemies including, predatory mites, minute pirate bugs, and lacewing larvae. We can release these predators on your property in order to control the population of these mites. This is a great option for homeowners that are worried about chemicals on their property or have kids that would love to be involved in releasing the bugs on the property.

Foliar Spray:

High populations of spider mites can be taken care of by applying a foliar spray specifically for mites.


Make sure your trees and shrubs get enough water during the upcoming hot summer days. As discussed above, spider mites like to prey on plants that are suffering from drought stress. Watering your trees and shrubs correctly and keeping them healthy overall is your first step in combatting spider mites.

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Samantha Huff

Samantha Huff is the marketing coordinator at RTEC Treecare. She enjoys learning about the technical aspects of trees and the insects and diseases that prey on them. She hopes that these articles can help homeowners gain control of their tree and shrub maintenance by being aware of the signs and symptoms of unhealthy trees.

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