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twig girdler control

July 17, 2012 By Tech Support

 

Every spring and fall I find these skinny beetles with heads like grasshoppers that chew on my dogwood and redbuds. They seem to cut around the branches making a cut which goes deeper and deeper. Sometimes the branch is cut off and then I find them doing this to another branch! Why are they cutting down my tree? I don’t see them eating any of the leaves or the bark. It’s like they’re just gnawing on the limbs and branches.


TWIG GIRDLER BIOLOGY

These are either twig girdlers or twig pruners. They typically target trees like basswood, Bradford pear, cherry, dogwoods, elm, hickory, honey locust, hackberry, oak, pecan, persimmon, poplar, redbud, wisteria and various other hardwood or fruit trees. Twig pruners are more active in the spring and twig girdlers are mostly active in the fall. Both are cutting branches so they can lay eggs because their young eats wood when they hatch.

TWIG GIRDLER
TWIG GIRDLER

 

TWIG GIRDLER DAMAGE

So after she cuts (or girdles) the branch, females will lay eggs in the fresh pulp down toward the center of the branch. Many times the branch will fall off the tree as it dies and rots. When the egg hatches, the larvae will feed on the dead branch (cellulose). They need the wood to be dead which is why the female cuts or girdles the limbs. This ensures the twig will die and be good food.

Here is what twig girdler damage looks like. Notice the limb targeted is less than 1 inch wide.

TWIG GIRDLER DAMAGE
TWIG GIRDLER DAMAGE

The larvae of both species will feed for a month or two and then go into a stage known as the pupae. The pupae typically hatch out adults which want to continue the cycle. Trees which experience activity will tend to have more and more activity. This happens because females leave a scent that other girdlers and pruners can smell. Twig girdlers can detect these scents from great distances and will come from far and wide to take advantage of a good tree to girdle.

 

TWIG GIRDLER TREATMENT

To stop the damage, you’ll need to spray the targeted trees. Treatments usually only need to be done once in the spring just before the activity starts and then again in late summer before they start their fall egg laying. There are two products that work well for this; one is a natural insect repellent and the other is a true pesticide that will last a lot longer and provide the best protection.

 

ORGANIC TWIG GIRDLER REPELLENT

The organic option is to apply some NBS INSECT REPELLENT to the limbs they want to girdle. It’s made from plant oils and insects will stay off treated surfaces. This spray won’t kill anything and is perfectly safe to spray on any tree, shrub or other targeted plants. Treatments will last 3-6 weeks and usually, two treatments will be needed with girdlers are active in either the fall or spring.

Add 3 oz per gallon of water and spray to the point of runoff on trees you want to protect. Retreat as needed; once a month is usually required when girdlers are active.

NBS Paint Additive
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BEST TWIG GIRDLER SPRAY

The second option is to spray a good true insecticide concentrate known as MAXXTHOR EC. This product will provide a long-lasting residual and keep both twig girdlers and twig pruners off treated surfaces for 4-8 weeks.

Be sure to spray the limbs they’ll target when treating. These are usually the smaller sized limbs toward the outside edges of the tree and not so much the sections close to the middle trunk of the tree.

Add .5 oz of Maxxthor per gallon of water and spray to the point of runoff. Treat as needed or once every 30-60 days to keep them away when active.


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Use a good PUMP SPRAYER to make the application; ours can reach up about 15 feet.

 

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If you need to reach up 20 feet or more,  a good HOSE END SPRAYER will usually do the job. Our sprayer will use the power of your garden hose to reach as high as your water pressure can reach. Add 2.5 oz of Maxxthor to the sprayer and fill to the 5 gallon line. This amount will let you treat 2-4 trees.

20 GALLON HOSE END SPRAYER
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CONTACT US

Give us a call if you need further help. Our toll-free is 1-800-877-7290 and we’re open Monday through Thursday, 8:00 AM to 7:00 PM. On Friday, 8:30 AM to 5:00 PM and on Saturday, 9:00 AM to 2:00 PM (Eastern Standard Time).

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Filed Under: Uncategorized Tagged With: branch cutter, girdling damage, twig girdler, twig pruners

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