Hemlock Wooley Adelgid

Hemlock Wooley Adelgid Hemlock woolly adelgid, commonly abbreviated as HWA, is a true bug native to East Asia that feeds by sucking sap from hemlock and spruce trees. In eastern North America, it is a destructive pest that poses a major threat to the eastern hemlock and the Carolina hemlock. The range of Eastern Hemlock extends north of the current range of the adelgid, but there are fears that the adelgid could spread to infect these northern areas as well.

Accidentally introduced to North America from Asia in 1924, HWA was first found in the eastern United States some decades later. In Pennsylvania, for example, the earliest record is from 1967. The pest has now been established in eleven eastern states from Georgia to Massachusetts, causing widespread mortality of hemlock trees. As of 2007, 50% of the geographic range of eastern hemlock has been impacted by HWA.

The presence of HWA can be identified by its egg sacs, which resemble small tufts of cotton clinging to the underside of hemlock branches. Hemlocks stricken by HWA frequently shift to a grayish-green appearance rather than the dark green of healthy hemlocks. In North America, the hemlock woolly adelgid reproduces asexually and can have two generations per year. Between 100 and 300 eggs are laid in the woolly egg sacs beneath the branches. Larvae emerge in spring and can spread on their own or with the assistance of wind, birds and/or mammals. In the nymph stage, the adelgid is immobile and settles on a single tree.

The hemlock woolly adelgid feeds on the phloem sap of tender hemlock shoots. It may also inject a toxin while feeding. The resulting desiccation causes the tree to lose needles and not produce new growth. In the northern portion of the hemlock's range, death typically occurs four to ten years after infestation. Trees that survive the direct effects of the infection are usually weakened and may die from secondary causes.

RESOURCES:

Treating Hemlock Wooley Adelgid with Safari 20SG

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Arena 50 WDG Insecticide, Valent

Arena 50 WDG Insecticide Provides the best control and the longest-lasting residual out there.

Active Ingredients: Clothianidin 50.0%
Insecticide Mode of Action: 4A
Insecticide Class: Neonicotinoids
EPA Signal Word: CAUTION / PRECAUCION
Application Rate Range: (see label)
Container Size(s): 40 Oz.

State Registrations Not for Sale to: VT

From $709.95

Onyx EC 23.4% Bifenthrin Insecticide, FMC

Onyx EC Bifenthrin Insecticide provides long lasting protection against Mountain Pine and other Bark Beetles.

Active Ingredients: Bifenthrin 23.4%
Insecticide Mode of Action: 3A
Insecticide Class: Pyrethroids
EPA Signal Word: WARNING/ AVISO
Application Rate Range: (see label)
Container Size(s): 1 Qt.

Discontinued Product This product has been discontinued by the manufacturer. Please consider BaseLine Insecticide, FMC.

State Registrations Not for Sale to: VT

Onyx Pro Insecticide, FMC

Onyx Pro Insecticide for Commercial Non-Food Use in Interiorscapes and on Outdoor Ornamentals, Christmas Trees, Nurseries, Lawns, Sod Farms, and Golf Courses.

Restricted Use: Yes
Active Ingredients: Bifenthrin 23.4%
Insecticide Mode of Action: 3A
Insecticide Class: Pyrethroids
EPA Signal Word: WARNING/ AVISO
EPA Registration Number: 279-4269
Application Rate Range: (see label)
Container Size(s): 1 Qt.

This product is a Restricted Use Pesticide and requires an Applicator's License for purchase. The Applicator's License must match the state for shipping.

State Registrations Not for Sale to: VT

From $214.95

Arena 0.25 Insecticide Granules, Valent

Arena 0.25 G Granular Clothianidin Insecticide Provides the best control and the longest-lasting residual out there.

Active Ingredients: Clothianidin 0.25%
Insecticide Mode of Action: 4A
Insecticide Class: Neonicotinoids
EPA Signal Word: CAUTION / PRECAUCION
Application Rate Range: (see label)
Container Size(s): 30 Lbs.

State Registrations Not for Sale to: VT

From $78.95

Merit 0.5 G Imidacloprid Granular Insecticide, Envu

Merit 0.5 G Imidacloprid Granular Insecticide provides the industry’s longest-lasting insect control.

Active Ingredients: Imidacloprid 0.5%
Insecticide Mode of Action: Group 4A
Insecticide Class: Neonicotinoid
EPA Signal Word: CAUTION / PRECAUCION
Application Rate Range: (see label)
Container Size(s): 30 Lbs.

State Registrations Not for Sale to: VT

From $41.95

Criterion 0.5 G Imidacloprid Granular Insecticide (Merit 0.5G), Bayer

Criterion 0.5 G Imidacloprid Granular Insecticide provides the industry’s longest-lasting insect control. Generic Merit.

Active Ingredients: Imidacloprid 0.5%
Insecticide Mode of Action: 4A
Insecticide Class: Neonicotinoids
EPA Signal Word: CAUTION / PRECAUCION
Application Rate Range: (see label)
Container Size(s): 30 Lbs.

State Registrations Not for Sale to: VT

Mallet 0.5G Granular Insecticide, (Merit 0.5 G), Nufarm

Mallet 0.5 G Imidacloprid Granular Insecticide provides the industry’s longest-lasting insect control.

Active Ingredients: Imidicloprid 0.5%
Insecticide Mode of Action: 4A
Insecticide Class: Neonictionids
EPA Signal Word: WARNING / AVISIO
Container Size(s): 30 Lbs.

State Registrations Not for Sale to: VT

From $37.95

Merit 75 WP Imidacloprid Insecticide, Bayer

Merit 75WP Imidacloprid Insecticide provides the longest-lasting insect control at exceptionally low use rates.

Active Ingredients: Imidacloprid 75.0%
Insecticide Mode of Action:
Insecticide Class:
EPA Signal Word: CAUTION / PRECAUCION
Application Rate Range: (see label)
Container Size(s): 2 Oz.

State Registrations Not for Sale to: VT

Midash 2SC Imidacloprid Insecticide (Merit 2F), Sharda

Midash 2SC T&O/PCO Insecticide/Termiticide has adequate residual activity that applications can be made preceding the egg laying activity of the target pests.

Active Ingredients: Imidacloprid 21.4%
Insecticide Mode of Action: 4A
Insecticide Class: Neonicotinoids
EPA Signal Word: CAUTION / PRECAUCION
EPA Registration Number: 83529-3
Application Rate Range: (see label)
Container Size(s): 1 Gal.

State Registrations Not for Sale to: VT

From $43.95

Imidacloprid 2F Select T/I Insecticide, Prime Source

Prime Source's Imidacloprid 2F Select Termiticide/Insecticide is a multipurpose, non-repellent liquid concentrate that may be used as an insecticide and termiticide.

Active Ingredients: Imidacloprid 21.4%
Insecticide Mode of Action: 4A
Insecticide Class: Neonicotinoids
EPA Signal Word: CAUTION / PRECAUCION
EPA Registration Number: 89442-5
Application Rate Range: (see label)
Container Size(s): 27.5 Oz.

State Registrations Not for Sale to: VT

Important Information Backordered: This Product has been backordered by the manufacturer. It is expected to be available mid-September 2025.

From $20.95

Imidacloprid 4SC Insecticide, Willowood

Willowood Imidacloprid 4SC is designed for protection from listed insects on cotton, potatoes, tobacco, vegetables and small fruit. For use as a soil treatment on Poplars and Cottonwoods. Controls darkling beetles and hide beetles in and around poultry houses.

Active Ingredients: Imidacloprid 40.7%
Insecticide Mode of Action: 4A
Insecticide Class: Neonicotinoids
EPA Signal Word: CAUTION / PRECAUCION
EPA Registration Number: 87290-26
Application Rate Range: (see label)
Container Size(s): 1 Gal.

State Registrations Not for Sale to: VT

Mainspring GNL Insecticide, Syngenta

Mainspring GNL Insecticide uses a novel active ingredient to quickly control chewing and sucking pests such as leafminers, caterpillars and thrips.

Active Ingredients: Cyantraniliprole 18.66%
Insecticide Mode of Action Group: 28
Insecticide Class: Anthranillic diamide
Application Rate Range: (see label)
Container Size(s): 1 Pt.

State Registrations Not for Sale to: VT

From $389.95

Carbaryl 4L Insecticide (Sevin SL), Drexel

Carbaryl 4L Insecticide is for use in Agriculture, Commercial and Residential sites. Carbaryl 4L Insecticide provides broad-spectrum control of more than 130 turf and ornamental pests.

Active Ingredients: Carbaryl 42.6%
Insecticide Mode of Action: 1A
Insecticide Class: Carbamates
EPA Signal Word: CAUTION / PRECAUCION
Application Rate Range: (see label)
Container Size(s): 2.5 Gal.

State Registrations Not for Sale to: VT

From $202.95

Azera Gardening Insecticide, OMRI Listed, MGK

Azera Gardening Insecticide is a premium organic product with multiple modes of action that provide excellent control of the hardest-to-kill, hard-bodied pests as well as quick knockdown and kill of the most destructive soft-bodied insects.

Organic Certification(s): OMRI
Active Ingredients: Azadirachtin 1.20% + Pyrethrum 1.40%
Insecticide Mode of Action: UN + 3A
Insecticide Class: Pyrethrins
EPA Signal Word: WARNING / AVISO
Application Rate Range: (see label)
Container Size(s): 8 Oz., 1 Qt.

State Registrations Not for Sale to: VT

Important Information Discontinued: This Product has been discontinued by the manufacturer.

Sevin XLR Plus Insecticide, Tessenderlo Kerley, Inc.

Sevin XLR Plus Insecticide provides broad-spectrum control of dozens of important pests including beetles, weevils and worms in tree fruit, nut, vine, citrus vegetable and other crops.

Active Ingredients: Carbaryl 44.1%
Insecticide Mode of Action: 1A
Insecticide Class: Carbamates
EPA Signal Word: CAUTION / PRECAUCION
EPA Registration Number: 61842-37
Application Rate Range: (see label)
Container Size(s): 2.5 Gal.

State Registrations Not for Sale to: VT

Important Information Manufacturer Change: This Product was previously made by Bayer. It is now produced by Tessenderlo Kerley, it is the same product.

From $189.95

Pointer (Imidacloprid) Insecticide, Wedgle Direct-Inject

Pointer Imidacloprid Insecticide is one of the most widely used and proven-effective insecticides on the market today. Pointer provides reliable systemic insect control on a wide variety of landscape ornamentals.

Active Ingredients: Imidacloprid 5.0%
Insecticide Mode of Action: 4A
Insecticide Class: Neonicotinoids
EPA Signal Word: WARNING / AVISO
EPA Registration Number: 69117-1
Application Rate Range: (see label)
Container Size(s): 120 ml., 1000 ml.

Ships From Manufacturer This product is drop-shipped by the manufacturer and will be shipped UPS Ground regardless of method chosen at checkout.

This product is a state Restricted Use Pesticide and requires an Applicator's License for purchase in: NY. The Applicator's License must match the state for shipping.

State Registrations Not for Sale to: VT

From $262.95

Retriever (Acetamiprid) Insecticide, Wedgle Direct-Inject

Retriever Acetamiprid Insecticide for tree injection application using the Wedgle direct-inject system to ornamental or non-bearing fruit and nut trees. Retriever Insecticide may be applied by injection directly into ornamental or non-bearing fruit and nut trees.

Active Ingredients: Acetamiprid 8.5%
Insecticide Mode of Action: 4A
Insecticide Class: Neonicotinoids
EPA Signal Word: CAUTION / PRECAUTION
Application Rate Range: (see label)
Container Size(s): 120 ml., 1000 ml.

Important Information This product is drop-shipped by the manufacturer and will be shipped UPS Ground regardless of method chosen at checkout.

This product is a state Restricted Use Pesticide and requires an Applicator's License for purchase in: NY. The Applicator's License must match the state for shipping.

State Registrations Not for Sale to: VT

From $288.95

Tree Tech, Microinjection Insecticides

The Tree Tech Microinjection Insecticides set a new standard for economical and environmentally safe tree health care. As traditional methods of applying chemicals and pesticides become less suited for environmentally sensitive uses, particularly in urban areas, the Tree Tech microinjection system continues to gain acceptance and wider use.

Sold Individually, Case Qty. = 25 Micro-injectors

State Registrations Not for Sale to: VT

From $5.00

Astro Termiticide Insecticide, FMC

Astro Permethrin 36.8% Termiticide and Insecticide provides effective broad label control of over 100 insects.

Active Ingredients: Permethrin 36.8%
Insecticide Mode of Action: 3A
Insecticide Class: Pyrethroids
EPA Signal Word: CAUTION / PRECAUCION
Application Rate Range: (see label)
Container Size(s): 1 Gal.

Product Suggestion We recommend the use of a spray adjuvant that helps break down waxy cuticle on leaf surfaces like Cide-Kick II with this product.

State Registrations Not for Sale to: VT

From $95.95

BaseLine Insecticide, FMC

BaseLine Bifenthrin Insecticide is approved for effective control of general pests. Featuring a concentrated version of the trusted active ingredient Bifenthrin in Onyx and Talstar insecticide. BaseLine Insecticide provides long lasting protection against Mountain Pine and other Bark Beetles.

Active Ingredients: Bifenthrin 23.4%
Insecticide Mode of Action: 3A
Insecticide Class: Pyrethroids
EPA Signal Word: WARNING / AVISO
Application Rate Range: (see label)
Pack Size(s): 1 Gal.

State Registrations Not for Sale to: VT

Important Information Currently Unavailable: This Product is currently unavailable in sizes above 1 Gal. Please give us a call at (303) - 747 - 6414 if you have any questions.

From $224.95

Bifen XTS Insecticide (25.1% Bifenthrin), Control Solutions

Bifen XTS Bifenthrin insecticide provides long lasting protection against Mountain Pine and other Bark Beetles.

Active Ingredients: Bifenthrin 25.1%
Insecticide Mode of Action: 3A
Insecticide Class: Pyrethroids
EPA Signal Word: WARNING / AVISO
Application Rate Range: (see label)
Pack Size(s): 1 Qt., 1 Gal.

State Registrations Not for Sale to: VT

From $46.95

Carbaryl 4L Insecticide (Sevin SL), Loveland Products

Carbaryl 4L Insecticide provides broad-spectrum control of more than 130 turf and ornamental pests.

Active Ingredients: Carbaryl 43.0%
Insecticide Mode of Action: 1A
Insecticide Class: Carbamates
EPA Signal Word: CAUTION / PRECAUCION
Application Rate Range: (see label)
Container Size(s): 2.5 Gal.

State Registrations Not for Sale to: VT

From $202.95

CoreTect Tree & Shrub Tablets, Bayer

CoreTect Tablet Insecticide contains the world's #1 tree and shrub insecticide found in Merit plus fertilizer.

Active Ingredients: Imidacloprid
Insecticide Mode of Action: 4A
Insecticide Class: Neonicotinoids
EPA Signal Word: CAUTION / PRECAUCION
Fertilizer Analysis: 12-9-4
Application Rate Range: (see label)
Container Size(s): 250 Tablets

State Registrations Not for Sale to: VT

Important Information Backordered: This Product has been backordered by the manufacturer. It is in the middle of switching from Bayer to Envu. Once we sell out of what we have left in stock there is no current ETA for new product.

From $2.95

Mallet 2F T&O Imidacloprid Insecticide (Merit 2F), Nufarm

Mallet 2F T&O Imidacloprid Insecticide, Generic Merit 2F provides lasting insect control at low use rates.

Active Ingredients: Imidacloprid 21.4%
Insecticide Mode of Action: 4A
Insecticide Class: Neonicotinoids
EPA Signal Word: CAUTION / PRECAUCION
Application Rate Range: (see label)
Container Size(s): 1 Pt., 1 Gal., 2.5 Gal.

State Registrations Not for Sale to: VT

From $23.95

Mallet 75 WSP Imidacloprid Insecticide, (Merit 75 WSP)

Mallet 75WSP Insecticide a broad-spectrum insecticide for use on turf, ornamentals and crops.

In stock, ships within 24 hours.

Active Ingredients: Imidacloprid
Insecticide Mode of Action: 4A
Insecticide Class: Neonicotinoids
EPA Signal Word: CAUTION / PRECAUCION
Application Rate Range: (see label)
Container Size(s): 4 x 16 Oz. Pkg, 4 x 4 x 16 Oz. Case

Discontinued Product This product has been discontinued by the manufacturer.

State Registrations Not for Sale to: VT

Merit 2F Imidacloprid Insecticide, Envu

Merit 2F Imidacloprid Insecticide provides the longest-lasting insect control at exceptionally low use rates.

Active Ingredients: Imidacloprid 21.4%
Insecticide Mode of Action: 4A
Insecticide Class: Neonicotinoids
EPA Signal Word: CAUTION / PRECAUCION
EPA Registration Number: 432-1312
Application Rate Range: (see label)
Container Size(s): 1 Gal.

State Registrations Not for Sale to: VT

From $67.95

Merit 75WSP Imidacloprid Insecticide, Bayer

Merit 75WSP Imidacloprid Insecticide provides the longest-lasting insect control at exceptionally low use rates.

Active Ingredients: Imidacloprid 75.0%
Insecticide Mode of Action: 4A
Insecticide Class: Neonicotinoids
EPA Signal Word: CAUTION / PRECAUCION
EPA Registration Number: 432-1318
Application Rate Range: (see label)
Container Size(s): 4 x 1.6 Oz. Pkg.

State Registrations Not for Sale to: VT

Important Information Backordered: This Product has been backordered by the manufacturer. It is in the middle of switching from Bayer to Envu. There is no current ETA for this product.

From $31.95

PyGanic EC 1.4 II Insecticide, MGK

PyGanic EC 1.4 II with 1.4% Pyrethrins Insecticide offers immediate insect control for organic production. PyGanic Crop Protection is an organically-compliant, broad-specturm contact insecticide.

Organic Certification(s): OMRI
Active Ingredients: Pyrethrum 1.4%
Insecticide Mode of Action: 3A
Insecticide Class: Pyrethrins
EPA Signal Word: CAUTION / PRECAUCION
Application Rate Range: (see label)
Container Size(s): 1 Qt., 1 Gal.

State Registrations Not for Sale to: VT

From $56.45

PyGanic EC 5.0 II Insecticide, MGK

PyGanic EC 5.0 II 5% Pyrethrins Organic Insecticide.

Organic Certification(s): OMRI
Active Ingredients: Pyrethrum 5.0%
Insecticide Mode of Action: 3A
Insecticide Class: Pyrethrins
EPA Signal Word: CAUTION / PRECAUCION
Application Rate Range: (see label)
Container Size(s): 1 Qt., 1 Gal.

State Registrations Not for Sale to: VT

From $166.45

Safari 20SG Dinotefuran Systemic Insecticide, Valent

Safari 20SG's new generation active ingredient, dinotefuran, controls a broad range of difficult pests including: Emerald Ash Borer, Adelgids, Japanese Beetles, Leafminers, Scales, Thrips, Whiteflies and more.

Active Ingredients: Dinotefuran 20.0%
Insecticide Mode of Action: 4A
Insecticide Class:
EPA Signal Word: CAUTION / PRECAUCION
Application Rate Range: (see label)
Container Size(s): 12 Oz., 3 Lbs.

Compare Product and Actives to: Zylam Liquid (PBI Gordon)

State Registrations Not for Sale to: VT

From $1.95

Hemlock Wooley Adelgid

Arena 50 WDG Insecticide, Valent

Onyx EC 23.4% Bifenthrin Insecticide, FMC

Onyx Pro Insecticide, FMC

Arena 0.25 Insecticide Granules, Valent

Merit 0.5 G Imidacloprid Granular Insecticide, Envu

Criterion 0.5 G Imidacloprid Granular Insecticide (Merit 0.5G), Bayer

Mallet 0.5G Granular Insecticide, (Merit 0.5 G), Nufarm

Merit 75 WP Imidacloprid Insecticide, Bayer

Midash 2SC Imidacloprid Insecticide (Merit 2F), Sharda

Imidacloprid 2F Select T/I Insecticide, Prime Source

Imidacloprid 4SC Insecticide, Willowood

Mainspring GNL Insecticide, Syngenta

Carbaryl 4L Insecticide (Sevin SL), Drexel

Azera Gardening Insecticide, OMRI Listed, MGK

Sevin XLR Plus Insecticide, Tessenderlo Kerley, Inc.

Pointer (Imidacloprid) Insecticide, Wedgle Direct-Inject

Retriever (Acetamiprid) Insecticide, Wedgle Direct-Inject

Tree Tech, Microinjection Insecticides

Astro Termiticide Insecticide, FMC

BaseLine Insecticide, FMC

Bifen XTS Insecticide (25.1% Bifenthrin), Control Solutions

Carbaryl 4L Insecticide (Sevin SL), Loveland Products

CoreTect Tree & Shrub Tablets, Bayer

Mallet 2F T&O Imidacloprid Insecticide (Merit 2F), Nufarm

Mallet 75 WSP Imidacloprid Insecticide, (Merit 75 WSP)

Merit 2F Imidacloprid Insecticide, Envu

Merit 75WSP Imidacloprid Insecticide, Bayer

PyGanic EC 1.4 II Insecticide, MGK

PyGanic EC 5.0 II Insecticide, MGK

Safari 20SG Dinotefuran Systemic Insecticide, Valent

Treegator Original Slow Release Watering Bag

Ooze Tube Professional Tree Establishment Systems

MCH 500mg and 1000mg (High Output) Bubble Caps, Synergy Shield Douglas-fir and Spruce Beetle Repellent

Verbenone 5.88gm and 7.84gm XR (Extended Release) Pouch, Synergy Shield Beetle Repellent, Synergy Semiochemicals

AXXE Herbicide, 2.5 Gal.

Grandevo WDG Bioinsecticide Miticide, OMRI Listed, Marrone Bio Innovations