Updated at: 30-12-2022 - By: Sienna Lewis

Spider mites on orchids can be eliminated using four different methods. Insecticidal soaps and sprays can be used in conjunction with other methods like as prevention, isolation, and spraying. With this in mind, you realize that spider mite control requires a comprehensive approach to management and prevention.

In the greenhouse, dealing with pests is easier since you have more control over the environment. Spider mites, which are minuscule and difficult to detect, are the exception to the rule when it comes to getting rid of pests. Regardless of whether you have orchids indoors or outdoors, the following methods are more appropriate.

Orchids are infested by three varieties of mites, as well. There are two types of mites that are known as spider mites or two-spotted mites. While flat mites and fake spider mites exhibit similar symptoms, they do not produce a web of their own.

Finally, if you detect yellowing on the leaves of your orchids, you may have a broad mite infestation.

Life Cycle

In order to produce one tiny nymph at a time, the female adult only ever lays one big egg every cycle. It takes a couple more molts to return to adulthood. Adult to adult can be completed in a week at high temperatures, which speeds up the life cycle..

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In overcrowded colonies, winged forms arise and fly to start new ones. Only temperature has an effect on the pace of development of the insects in a greenhouse, thus they can maintain a continuous cycle.

The females begin to produce a few males in the autumn. It is common for females born at the same time to produce offspring for the next year by mating and laying eggs.

Types of Mites

The Brevipalpus californicus A mite that feeds on orchid leaves causes the first visible damage to appear as silvery spots that later sink and turn brown. The leaves of heavily diseased plants will turn yellow and fall off. People of this species can’t be seen since they lie flat against the leaf and move slowly, but cast skins can be used to detect a population.

Mites from the genus Phalaenopsis (Tenuipalus pacificus) These are bogus spider mites, which don’t build webs. In California, Florida, Panama, and other European countries, this mite is a nuisance. These mites feed on plants, causing dark patches and eventually causing tissue death. The mite’s life cycle is at least 64 days long; the incubation phase is 18 to 23 days, and each of the developing stages is 14 to 15 days long.

Red Spider Mite, also known as the Red Spider Mite, is a two-spotted spider mite (Tetranychus urticae) The mites are greenish yellow, wingless, eight-legged invertebrates with a dark mark on either side of their body. They turn a deep red color as the days get shorter in the fall. You’ll notice webs and aggregations of mites at various spots on the plant as their number grows. Their diet consists of sucking plant cells’ chlorophyll out of their undersides.

When plants are under stress in hot, dry circumstances, these mites thrive, but they are less of a concern when the humidity level is high. When it comes to fresh growth and thin-leaf orchids, you’re more likely to find Two-spotted Spider Mites.

As many as five eggs a day are laid by an adult female two-spotted spider mite. In just three weeks, an adult female can generate more than 100 eggs. They multiply at an alarming rate: ten spider mites in May can become one thousand by June and one hundred thousand by July. As temperatures rise, the incubation and adolescence-to-adulthood times for eggs and other organisms shorten. Developing from egg to adult takes less than a week at 86 F and about 14 days at 70 F. In just a few days, a small population of mites can quickly grow into a full-blown infestation.

Adding to the problem is the fact that red spider mites can hibernate through the winter and re-infest plants in the spring and summer, even though artificial illumination can prevent the mites from hibernating.

General Prevention

Implement cultural management measures like prevention, cleanliness, and plant inspection to decrease orchid pest problems. Pests are less likely to thrive in an environment with the right amount of water, temperature, light, fertility, and humidity. Make sure you’re familiar with the specific cultural customs of the orchids you’re growing.

Another way to keep orchid pests at bay is to keep the environment clean. Remove any and all plant detritus, as well as the previous potting soil. Remove the old leaf sheaths to prevent pests from hiding in them. Keep an eye out for spider mites by inspecting the underside of leaves.

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Methods of Control

Mites can be prevented by increasing the humidity in the developing area. During the winter, when the air is dry and mites have no natural enemies to keep them in check, mites can be particularly troublesome on plants in heated greenhouses or indoors. One technique to reduce the population is to wash the plants completely, wiping each leaf clean. Plant sap is so dilute that mites must suck sap from individual cells on the leaf’s surface in order to obtain nutrients they need and eliminate water they don’t. When the air is dry, it is easier for them to get rid of the water, thus they perform better.

The natural enemies in the garden, along with the more demanding environment, is typically enough to get rid of the problem. If the time of year permits, put the plants outside.

Biological control is also an option. Pest-controlling predator mites are introduced onto afflicted plants, where they prey on disease-carrying mites. Only a small number of mites will prevent predators from catching up with this method. The catalogs of biological control suppliers should be consulted for mite natural enemies. If you are employing biological controls to regulate mite populations, do not use pesticides because they will also kill beneficial mites.

For mite management, a number of compounds (referred to as acaricid or miticides) have been produced particularly. These can be effective in reducing mite populations that are out of control. To get the best results, use these chemicals with caution and spray them carefully. Some insecticides and miticides cannot be used on orchids, so be cautious while using them. For this reason, it is always best to test any new chemical on a small sample of plants before applying it to the entire collection, especially if they are in bloom.

Alternatively, a pint of 409 home cleaner mixed with a pint of rubbing alcohol to form a gallon of spray can be used. This technique is particularly useful in the prevention and treatment of minor infestations. Apply a thick layer of miticide to the undersides of leaves, whether it’s handmade or bought. For a total of six to eight applications, reapply every three to four days. Adults and hatchlings will be eradicated as a result of this.

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In order to get rid of spider mites, prevention is the first step. Preventative measures are still necessary even if you see indicators of mite infestation. The American Orchid Society, for example, stated that these pests love a warm and dry climate.

This is where a greenhouse comes in handy because you can keep an eye on the temperature and humidity levels inside. The society even said that spider mites are more comfortable to deal with in high humidity, which suggests that managing humidity and wetness in the greenhouse might slow down their activity. Mist your plant frequently to keep pests under control, avoid damage, and make cleanup easier.

Avoid overwatering the orchids and give them a warm shower once a month to keep spider mites at bay. If you lower the temperature, it will also be beneficial. Ensure that orchids are kept at the correct temperature, but keep an eye out for conditions that spider mites enjoy.


The University of Florida recommends that infected orchids be isolated as soon as possible. This will make it easier for you to control the spider mite population and activity when you carry out the next treatments. Allow for an area of isolation, and you may subsequently use this space to store fresh orchids as well.

When inspecting plants that have been infected, you should also check the soil around them. To avoid recontamination, remove the old media and repot to avoid the growth of spider mites in the earth. Before repotting, take sure to rinse the roots of the orchid plants with distilled water.


Homemade spider mite control methods include spraying or brushing the affected plant. To eliminate the minute mites from the leaves of the orchid, begin by spraying the plant with water. Under the leaves is a common hiding place for mites, so be sure to examine here as well.

To get rid of any concealing mites, wet a soft sponge with water. In addition, you should do everything you can to remove the webs and eggs. As long as the problem remains, spraying the affected orchids with water can continue for up to six weeks.

A soapy mixture can also be used before rinsing to further reduce the quantity of spider mites on the foliage of your plants. Alcohol and cotton swabs are even recommended by the American Orchid Society for cleaning difficult to reach spots. If that doesn’t work, you can also use a light liquid soap and alcohol spray.

Alcohol is sufficient for mild infestations, but be careful with powerful solutions to prevent harming orchids. Rub alcohol should be avoided on tender or thin-leaved plants. Using 1 part rubbing alcohol, 1 part Murphy’s oil soap, and 2 parts water is a good starting point.

Insecticidal soaps and horticultural oils

Insecticides and insecticidal soaps can be used if the preceding three methods fail. To be safe, it’s recommended to read the product instructions on the label before using it. Insecticidal soaps and horticultural oils are safer and more effective than insecticides and pesticides.

Since they’re less harmful to the environment, they’ll be more effective when an infestation is just getting started. Spider mites can only be killed by direct contact, thus they must fully soak the orchids. Neem oil mixed with water and plant-safe detergent is a reasonable alternative.

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Miticides can be used to control mite infestations that are difficult to control if the label recommendations are followed. Make sure you know how often and for how long you should use the insect repellent to avoid an overpopulation. Keep in mind that not every insecticide can be used on orchids, and always transfer the plants outside to ventilate the fumes.


When we see orchid pests, we feel like we’re going into a panic mode. There are, however, four techniques to rid orchids of spider mites. Controlling the mite population is the first step in preventing subsequent infestations.

Water or alcohol may be used to treat the plants if they are still infected. Insecticides or insecticidal soap may be used if necessary. The main thing to keep in mind when using these cures is that you must always read the directions carefully.