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Walnut Twig Beetle

Walnut Twig Beetles  (Pityophthorous juglandis)


Walnut Twig Beetle
Walnut Twig Beetles 
 were found to be killing trees in Colorado as early as 2003. Walnut Twig Beetles vector the disease Thousand Cankers disease caused by a fungus, Geosmithia morbida. This is a newly recognized disease 2008 of primarily Black walnut trees Juglans nigra.  Thousand Cankers disease has produced widespread death of black walnut trees in many western states during the past decade. Other species of walnut such as Arizona walnut, English walnut, and California walnut have all shown varying degrees of susceptibility to this fungus.

Walnut Twig Beetle ScaleThe affected area of the walnut tree is shallow and confined to thephloem so that it can easily be missed if inspection cuts are made too deeply into the sapwood. Minor weeping may occur at points where walnut twig beetles enter the bark but often no symptoms are associated with the beetle attacks aside from minute entry wounds or star shaped cracks. Early symptoms are yellowing of leaves and foliage thinning of the upper crown of the tree. As the disease progresses larger limbs are killed which may have dead, flagging leaves associated  with them. In end stages the fungus may be introduced into the trunk and large cankered areas develop in the trunk. In susceptible hosts, such as black walnut (Julgans nigra), trees usually die within three years after initial symptoms are observed in the crown of the tree.

Lindgren 4-funnel trapA newly recognized fungus, Geosmithia, kills a localized area in the phloem just under the bark in >2cm wood after introduction by the walnut twig beetle. These dead areas often overlap or coalesce from numerous strikes (35 insects per square inch of wood) causing nutrient disruption to foliage and thus leading to branch dieback.

Detecting and Identifying Walnut Twig Beetle Guidlines Walnut Twig Beetle



Installing Walnut Twig Beetle Traps VideoKnowledge Base Videos

 Installing Walnut Twig Beetle Traps (5 mins)
 Maintaining Walnut Twig Beetle Traps (5 mins)

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Walnut Twig Beetle Lindgren Trap, Synergy Semiochemicals

Walnut Twig Beetle Lindgren 4-Funnel Traps, Originally designed by Staffan Lindgren at Simon Fraser University are the most effective and user-friendly beetle traps used worldwide.

Trap Type - Pheromone Trap, Lures Sold Separately
From $36.95

Walnut Twig Beetle Lures

Walnut Twig Beetle Lure

Min. Order 25 lures

Please allow 7 to 14 days for delivery.

From $2.70

BaseLine 23.4% Bifenthrin Insecticide, FMC

BaseLine Insecticide provides long lasting protection against Mountain Pine and other Bark Beetles.

Active Ingredient: Bifenthrin 23.4%

Signal Word - WARNING / AVISO

From $51.95

Bifen XTS 25.1% Bifenthrin Insecticide, Control Solutions

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

Active Ingredient: Bifenthrin 25.1%

Signal Word - WARNING / AVISO
From $39.95

Onyx EC 23.4% Bifenthrin Insecticide, FMC

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

Active Ingredient: Bifenthrin - 23.4%

EPA Signal Word - WARNING / AVISO

From $126.95

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 Group: 3A
Insecticide Class:
Pyrethroids
EPA Signal Word: CAUTION / PRECAUCION
Application Rate Range: (see label)
Container Size(s): 1 Gal.
From $70.95

Tengard SFR Termiticide Insecticide, UPI

Tengard SFR Termiticide and Insecticide for effective broad label control of over 100 insects.

Active Ingredients: Permethrin 36.8%
Insecticide Mode of Action Group: 3A
Insecticide Class:
Pyrethroids
EPA Signal Word: CAUTION / PRECAUCION
Application Rate Range: (see label)
Container Size(s): 1 Qt., 1.25 Gal., 55 Gal.
From $18.45

PyGanic Crop Protection EC 5.0 II Organic Insecticide, OMRI Listed, MGK

PyGanic Crop Protection EC 5.0 II 5% Pyrethrins Organic Insecticide. OMRI Listed.

Active Ingredient: Pyrethrum 5.0%

Signal Word - CAUTION / PRECAUCION
From $143.95

Sevin SL Carbaryl Insecticide, Bayer

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

Active Ingredient: Carbaryl 43.0%

Signal Word - CAUTIION / PRECAUCION

From $115.95

Carbaryl 4L Insecticide (Sevin SL), Loveland Products

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

Active Ingredient: Carbaryl 43.0%

Signal Word - CAUTION / PRECAUCION

From $125.95

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