The arborvitae is a beautiful tree that is native to the Northern Hemisphere and can be found in North America, Europe, and Asia. It has been used for centuries by humans, and is often referred to as the “tree of life.” It’s hardy, it’s beautiful, and it smells amazing, but it can be hard to keep arborvitae alive. Arborvitae can suffer from insect infestations if they’re not cared for properly, which can lead to their death.
Arborvitae pests and diseases can be a problem for the landscape. You may have heard on the news lately that whiteflies are one of those arborvitae pests which have been affecting many people in and around Maine. News reports have also featured another common arborvitae pest, aphids. Arborvitae insects can be just as troublesome as insects in other parts of your yard, so it’s important to know what to do about them.
We have gotten several inquiries this year regarding the arborvitae leaf miner, Argyresthia thuiella. This leaf-mining pest is a caterpillar (Lepidoptera) that primarily feeds on arborvitae (Thuja spp.).The adults are tiny, silver to gray moths with a wingspan of only 1/3 inch. The forewings contain brown and black markings. The legs and abdomen are light brown. The moths can be found flying around in June.
Power Spray Arborvitae Pest Control
Foliage damaged from arborvitae leaf-miner feeding is very easy to distinguish from healthy foliage. Hold damaged leaves up to the light to see the larvae and frass within the leaf tissue. Although plants generally survive the attack, continued feeding by heavy arborvitae leaf-miner populations may kill twigs and branches. The larvae overwinter within the mined leaves and feed for a short period of time in the spring before entering a pupa stage, which lasts approximately 3 to 5 weeks. Adults chew an exit hole from the mined leaves in late spring to early summer. There is one generation per year in Illinois.
Arborvitae leaf miners are attracted to Thuja planted in shady locations, so placing plants in the sun will help alleviate problems. In addition, pruning out heavily infested twigs or branches and placing debris in a sealed bag or other container removes leaf-miner larvae. Arborvitae leaf miner is highly susceptible to natural enemies, such as parasitic wasps (parasitoids), because they cannot escape being located within the plant tissues. However, the natural parasitoid populations may not provide sufficient control. As a result, the use of insecticides may be warranted. Insecticides recommended for controlling arborvitae leaf miners include abamectin (Avid), acephate (Orthene), and chlorpyrifos (Dursban). These materials are able to penetrate through the leaf surface and kill the larvae.
How Do You Treat Arborvitae Disease?
Arborvitae disease is a fungal disease that affects arborvitae trees, and it can be difficult to treat. The best way to treat arborvitae disease is with a fungicide called Benomyl. You can apply the fungicide by spraying the tree, but this method will likely result in damage to other plants and may not be effective.
A preferable approach is to inject the fungicide into the tree’s root system. To do this, you need to dig around the tree’s base and place a plastic container under it so that you can collect water from its roots as they drain. Then mix up some Benomyl and inject it into the container. You’ll want about one part water for every two parts Benomyl; this ratio will depend on how much of an area has been affected by arborvitae disease.
Will Damaged Arborvitae Grow Back?
Yes, damaged arborvitae will grow back. But, you have to be careful with how you treat them because they are very sensitive to damage. If you’re looking at a broken tree that has been injured by something like a storm or animal attack, you should understand that the tree may not grow back in the way you expect.
The first question to ask yourself is whether or not the damage restricts the ability of the plant to produce new growth. If so, then your best bet is to remove it entirely and start over with a new sapling. If not, then there’s hope for a comeback.
A lot of people think that if they break off a branch from arborvitae, it will grow back as long as it’s green. This isn’t always true; if the branch was broken near its base and had been growing for many years before being damaged, there might not be enough energy stored up in its internal system to create new growth from just one tip or bud from that limb. In this case, it’s best just to cut off any remaining parts and let them dry out before composting them away, they won’t come back anyway.
What Is the Best Spray for Bagworms on Arborvitae?
The best spray for bagworms on arborvitae is insecticidal soap. This product can be purchased at your local garden store and can be used to kill the bagworm larvae that are eating away at your plant’s leaves. The soap will not harm any other types of insects, so it’s the perfect solution for preventing them from taking over your plants.
The best way to use this product is by spraying it directly onto any leaves that have been damaged by insects. If you want to make sure that all of the larvae are killed, you should spray all parts of your plant, including stems and branches as well as leaves.
How Do I Increase My Arborvitae Growth?
Arborvitae is a type of evergreen that grows horizontally, making it a good choice for tight spaces and areas where you don’t have room for a standard tree. It’s also known for its hardiness and resistance to pests and disease.
If you want more growth from your arborvitae, there are some simple steps you can take.
First, make sure the soil around the tree is moist but not too wet. Arborvitae likes well-drained soil, so if the area is prone to flooding or is otherwise lacking in drainage, consider adding gravel or other drainage material to improve the situation.
Next, consider adding fertilizer to your arborvitae’s soil in March or April after it has lost its leaves but before new growth begins to appear. Arborvitae will grow up to six inches per year when fertilized appropriately.
List Of Insecticide For Arborvitae
Arborvitae is a coniferous evergreen shrub that requires minimal maintenance and care. However, it can be susceptible to insect infestation, causing damage to the plant and reducing its lifespan. The following is a list of insecticides for arborvitae:
BIOADVANCED 701287A 3 in 1 Insect, Disease, and Mite Control for Plants, 32 Ounce, Ready-to-Spray
- 3-in-1 FORMULA: Insect, disease, and mite control for use on roses, flowers, shrubs, and trees
- INSECT KILLER: Armyworm killer. Also kills Aphids, Spider Mites, Japanese Beetles, Caterpillars, and more
- DISEASE CONTROL: Fungicide controls Blackspots, Powdery Mildew, and more
- RAINPROOF PROTECTION: Systemic rainproof protection lasts up to 30 days
- COVERAGE AREA: Treats up to 190 rose bushes with the easy hose-attachment applicator
- RESTRICTIONS: Not for sale in NY, CT, MD & VT
Additional Info :
BioAdvanced 701900B 12-Month Tree and Shrub Protect and Feed Insect Killer and Fertilizer, 4-Pound, Granules
- 12-MONTH PROTECTION: With just one application, kills listed insects and prevents new infestations for up to a year
- INSECT & PEST KILLER: Kills Japanese Beetles, Emerald Ash Borers, Adelgids, Leafminers, Aphids, and more
- SLOW-RELEASE FERTILIZER: Plant food and fertilizer improve the health of your trees and shrubs
- SYSTEMIC PROTECTION: Protects your potted and outdoor trees and shrubs from the roots to the stem of every leaf
- RESTRICTIONS: Not for sale in CT, MD & VT. Not for sale, sale into, distribution, and or use in Nassau, Suffolk, Kings and Queens counties of NY
Additional Info :
Garden Safe Brand Multi-Purpose Garden Insect Killer, Ready-to-Use, 24-Ounce
- CONTAINS BOTANICAL INSECTICIDES: Spray on roses, vegetables, houseplants, ornamentals, trees, shrubs and flowers right up to the day of harvest.
- KILLS ON CONTACT: Kills aphids, tomato hornworms, green fruitworms, and other listed insects.
- PROTECTS YOUR WHOLE GARDEN: Use both indoors and outdoors.
- READY-TO-USE PEST CONTROL: Spray upper and lower leaf surfaces – no mixing required.
- APPLY AS NEEDED: Treat weekly or apply as needed to control infestations (up 10 to times per season).
Additional Info :
Garden Safe 511038 Garden SafeFungicide, 24 oz – 1 count
- FOR ORGANIC GARDENING: Can be used up to the day of harvest – OMRI (Organic Materials Review Institute) Listed.
- INSECTICIDE/FUNGICIDE/MITICIDE: Three garden products in one.
- READY-TO-USE SPRAY: Spray for complete coverage of all plant tissue.
- FOR USE ON: Roses, flowers, houseplants, ornamental trees, and shrubs, fruits, and vegetables.
- PREVENTS LISTED FUNGAL DISEASES: Apply weekly to every 2 weeks until the potential for disease is no longer present.
Additional Info :
Ortho Home Defense Insect Killer for Indoor & Perimeter2: With Comfort Wand, Kills Ants, Cockroaches, Spiders, Fleas & Ticks, Odor Free, 1.1 gals.
Price: $14.49 ($0.10 / Fl Oz)
- Ortho Home Defense Insect Killer for Indoor & Perimeter2 with Comfort Wand kills ants, cockroaches, spiders, fleas, ticks, and other listed bugs; the formula is odor free, won’t stain, and keeps listed bugs out
- KILLS BUGS INSIDE: Kills those annoying home-invading insects, including ants, cockroaches, spiders, fleas, ticks, scorpions, beetles, silverfish, centipedes, and millipedes
- KEEPS BUGS OUTSIDE: Creates a bug barrier that will kill bugs you have and prevents new bugs for up to 12 months (applies to ants, roaches, and spiders indoors on non-porous surfaces)
- NO STAINING OR STINK: This spray can be used indoors and out, leaves no residue, and has no odor; people and pets may re-enter treated areas after the spray has dried
- WAND MAKES APPLICATION EASY: The Comfort Wand eliminates hand fatigue, and there’s no pumping required, making it easy to spray along your home’s perimeter–indoors and outside
Additional Info :
With a little bit of effort and a lot of patience, you can treat your arborvitae tree for scale insects. You just need to know what products are safe for use on this type of plant and how to apply them. The most important thing is to be sure that you’re using an insecticide that is labeled for use on arborvitae trees. If you don’t see it listed on the label, don’t use it.
You also must apply the insecticide at exactly the right time of year, early spring or fall is best, and only when your tree is actively growing so that it can take in nutrients from the soil more easily.