Since most insecticides are rendered ineffective by scale’s protective layer, treating it can be challenging. The best way to control infestations is through natural or mechanical controls. Try the following techniques if scale insects are present:
Monitor:
Keep an eye out for scale on your plants since once the soft or hard shell has formed, no insecticide will work. When the insects are most vulnerable, in the spring, watch for the initial crawler stage; cleanse the area before applying a spray.
Use water:
Use a mild hose blast to loosen eggs, nymphs, or adults from small infestations. To kill them, dispose of in a bucket of soapy water. Those stems or leaves that have sooty mold should be cleaned.
Use natural predators:
Scale-eating insects provide organic pest control. These include ladybugs, soldier beetles, parasitic wasps, and lacewings. Create habitat to draw and maintain these insects. You can order beneficial insects online or at your local garden center.
Apply horticultural oil:
Neem oil, an organic horticultural oil, works on eggs, nymphs, and adults because it coats and suffocates the insects. Don’t forget to adequately cover the entire plant. Applying oil in the spring before leaves appear will help control insects and overwintering eggs. Multiple applications can be required. Carefully follow the directions since some plants could be sensitive and because applying oils requires a specific range of temperature.
Use insecticidal soap:
Use a store-bought insecticidal soap or make your own. The crawler stage, before the scale develops its protective layer, is when this therapy is most effective. Multiple applications can be required.
Can scaling harm succulent plants?
They are parasites that cling to the stems of succulent plants and rob them of nutrients, harming the plant and ultimately killing it if left untreated.
This scale consumes a succulent or cactus by secreting hemolymph, a fluid with high sugar and water content. When you touch scale, they feel glossy or sticky because of this.
They typically cluster together, but if left untreated, they may disperse.
Cochineal scale is one of several scale insects that can harm succulents, although they all have comparable life cycles and common symptoms.
It first manifests as little, black pimples or patches that spread to cover the entire leaf. Scale insects will continue to spread and harm additional leaves if handled.
When feeding off the roots of your plant, scale occasionally appears beneath the soil’s surface!
If there is scale under the soil, you will notice regions that appear to be browning around the base of the plant. When you notice scale, it’s imperative to control it.
What is the ideal method of treating scale on plants?
Despite your best efforts, nature will occasionally take its course and you will need to regard your plant as a scale. The backside of these small insects’ shells reveals that they have securely attached themselves to your plant and are actively draining its sap away, despite the fact that they can resemble benign brown growths on your plants.
Scale can be any color, shape, or size, but it most frequently takes the form of small, brown, spherical lumps on the leaves and stems of your plant. There are two basic categories of scales: unarmored or soft scales and armored or hard scales. The names allude to the insect bodies’ protective shell-like covers. The protective scale that the insect is covered with makes control difficult, as it is with mealybugs. Scales can be round, oval, or oyster shell shaped, and they can be up to 1/8 inch long. They are primarily brown in color, but they can also be white or black.
Under their shells, females can lay hundreds of eggs, which hatch into 1/100-inch-long, translucent worms. The initial few seconds of a scale’s life are spent moving around until they cling onto a plant’s leaf permanently. These defenseless crawlers, however, go on to fresh feeding grounds where they affix to the plant and create their own protective shells. Since it’s uncommon for a plant to have only one scale, there probably are more lurking beneath the surface. Treat your plant as soon as you see any symptoms to save it from becoming overwhelmed.
The safest way to start treating scale, whether it has a soft or hard shell, is to start by removing the pests with your fingernail, a soft toothbrush, or even a Q-tip bathed in rubbing alcohol. Soft shell scale bugs can be receptive to insecticide. Most can be easily taken off the plant with a little bit of push, while tougher adults can sometimes be more resistant. To get rid of any stray bugs you may have plucked off but dropped into another area of the plant, rinse the plant under the sink or shower faucet. While doing so, take care not to moisten the soil excessively.
In order to treat any remaining larvae, the next step is to apply an insecticide. It’s crucial to treat the entire plant with your selected insecticide even if you manually removed every bug because the larvae are so minute they may still be present. Neem oil is recommended as an all-natural, organic therapy and preventative measure, but insecticidal soap may be more effective for severe infestations. Simply use either mixture to evenly mist the entire plant from top to bottom, then use paper towels to clean the foliage. Please take note that sunlight mixed with the insecticide might burn a plant, thus insecticide should only be used at night or when the plant is out of direct sunlight.
a severe infestation of scales. Notice the buildup of scale close to the stem, which is the leaf’s juicier and more nutrient-rich area.
While it heals, keep the afflicted plant separate from the rest of your collection, taking extra care to make sure that none of its leaves touch those of any other plants. Continue using this method every 7 to 10 days until the scale bugs stop appearing. Make sure to periodically and completely inspect all plants for future prevention. A nice addition to regular plant maintenance is dusting leaves and checking for pests.
Does potting soil include scale?
- If you experience recurrent infestations, consider carefully removing the top inch of soil from the pot and replacing it with new potting soil because scale can hide in the soil of a houseplant.
- Crawlers have the ability to leave the plant and later return to reinfest it. Remove the plant from the area and clean any cracks where plant pests might be hiding to avoid this. Inspect the plant tray and pot’s outside lip, interior corners, and bottom for any scale insects that might be hiding there.
- Trim any plant leaves that are seriously infested, and discard them (outside of your home). * Avoid over-trimming to avoid killing your plant.
- Be cautious to sanitize the pot before reusing it if you wish to repot a plant after treating it for scale. Houseplant scale insects can readily infest any plant that is potted in that container by hiding on the rim or the edges. Use hot, soapy water to thoroughly clean the pot.
How can you naturally treat plant scales?
These sap-sucking bugs cling to host plants’ twigs, leaves, branches, and fruits. Learn about the least-toxic ways to control the scale here.
Over 1,000 species of scale insects are found in North America, and they are frequently seen on houseplants, ornamental shrubs, backyard trees, and greenhouse plants. They are so strangely formed, stationary pests that they frequently resemble bumps, not insects. In many instances, severe infestations develop undetected before plants start to experience damage. It’s possible for large populations to cause poor growth, diminished vigor, and chlorotic (yellowed) leaves. A host that has been infected could die if the infestation is not stopped.
Identification
There are two categories of scale insects:
Armored (Hard)
secrete a tough, non-body-attached coating (1/8 inch long) to protect themselves. Under this spherical armor, the hard scale feeds and lives, but it does not move around the plant. No honeydew is secreted by them.
A waxy film, up to 1/2 inch long, that is a component of the body is called SoftSecrete. They frequently have the ability to travel small distances (though they do so infrequently) and make a ton of honeydew. Soft scales can be flat or nearly spherical in form.
Life Cycle
Under their protective covering, adult females lay eggs that take one to three weeks to hatch. The newly hatched nymphs (known as crawlers) emerge from this covering and travel around the plant until they find an appropriate eating place. Young nymphs pierce the plant with their mouthparts and start to feed. As they get older and become immovable adults, they eventually construct their own armor. They do not pupate and, especially in greenhouses, may have numerous overlapping generations per year.
It should be noted that many species’ males grow wings as adults and resemble little gnat-like insects. They don’t eat vegetation and are rarely spotted. Females frequently procreate without sex.
Control
- Pruning and discarding infected branches, twigs, and leaves will help get rid of scale insects.
- When scale counts are low, they can be manually rubbed or plucked from plants.
- When infestations are mild, dabbing individual pests with a cotton swab dipped in alcohol or a leaf shine containing neem will also work.
- Ladybugs and lacewings, two helpful insects that are sold commercially, are predators of the immature larval or “crawler stage.”
- The larvae can also be eliminated with natural insecticides such as d-Limonene and insecticidal soap. The environment does not retain these compounds very well, thus many treatments throughout egg hatching will be necessary for efficient control.
- The main insecticidal component of neem oil, azadirachtin, may be found in Azamax. With its numerous modes of action and organic approval, this concentrated spray essentially eliminates the possibility of pest resistance growing. The best part is that it doesn’t harm honey bees or many other useful insects.
- All pest life phases, including adults that are shielded from most other pesticides by their armor coats, are controlled with horticultural oils and other safe, oil-based insecticides.
- As a last option, quick-acting natural pesticides should be utilized. These natural insecticides, which are derived from plants with insecticidal qualities, have less negative side effects than synthetic chemicals and degrade more quickly in the environment.
Advice: Ants will defend these pests from their natural predators and eat on the honeydew that sucking insects produce. To naturally get rid of ants, apply Tanglefoot Pest Barrier to the trunks of trees or the stalks of woody plants.
What does a succulent’s scale resemble?
Succulents’ scale is simple to spot. Small lumps resembling scale infestations are common. The distribution of the bumps can vary depending on the size of the infestation.
Alcohol can I spray on succulents?
Aphids and mealybugs are the most frequent pests of succulent plants. Neem oil, insecticidal soaps, rubbing alcohol in a spray bottle, or cleaning the infected regions with water can all be used to control them. The bugs are promptly killed by a fine, light spray of rubbing alcohol that doesn’t harm succulent foliage.
Which pesticide works best against scale insects?
Scale crawlers are the ideal target for pesticides. Check the scale-infested plant at least once a week until you see the crawlers because they can take up to 4 weeks to fully emerge. Because crawlers from a single generation might hatch over a period of many weeks, you may need to apply insecticides two to four times at 5- to 7-day intervals for effective control.
No matter how many treatments are required, the plant must be completely covered each time, especially when using contact insecticides. All of the twigs, branches, and leaves should be completely covered.
Dormant oils should be used when temperatures are over 45 degrees F for 24 to 48 hours prior to the start of spring growth. To apply the pesticide and dilute it, follow the directions on the product label.
When it’s less than 90 degrees for 24 to 48 hours, use summer sprays. When the crawlers are active, spray twice to four times at intervals of seven to ten days. Sprays with emulsifiable concentrates (EC) are preferable. You can use summer oils on their own or in conjunction with other insecticides.
Apply systemic insecticides like imidacloprid around the base of scale-infested trees, shrubs, or potted plants when scales are on plants that are actively growing. Observe the dilution and application rate recommendations on the product label.
You can use a commercially available insecticidal soap to control scale infestations on houseplants or create your own soap solution by diluting a moderate dishwashing detergent. If at all possible, completely coat all plant parts with the soap solution using a hand-held sprayer; if not, do so.
In order to successfully control the scales, you might need to reapply the soap. Systemic insecticides can also be used, and the proper solution should be applied all around the plant’s base. The application and dilution rates are listed on the product label.
Use cotton balls or swabs to wipe rubbing alcohol onto small houseplants to eradicate smaller scale infestations.
On houseplants, contact insecticides can also be employed, but their effectiveness is short-lived. Examples include aerosol sprays containing pyrethrins and permethrin. Apply them again every one to three days until the scales are under control. Any aerosol should be sprayed at least 12 inches away from the plant.
Check the results of treatments to see if any additional applications are necessary. Slide your thumb across a set of scales to check if you’ve effectively controlled them. Scales that are dead will be dry, hollow, and easy to peel off.