Pine Beetle in our Community - Brochure
1. ALL species,
ages, and sizes of healthy pine tree trunks
should be sprayed, from the ground to the top of the tree, with
an insecticide labeled for Mountain Pine Beetle (MPB) before June
1st each year. Spray spruce tree trunks also.
2. All trees infested with MPB and other bark beetles should
be removed and properly disposed of before June
1st each year.
a. Assistance is available for removing
bark beetle infested trees for lower income, owner occupied, property
owners in the City
of Cheyenne. Call the Cheyenne Urban Forestry office at 637-6428 for more information.
3. Properly dispose of infested wood at the Cheyenne Compost
Facility - 3714 Windmill Road.
4. Do not bring firewood from the mountain forests into
Cheyenne until October. Burn all firewood before
April each year.
Pine Beetle Information from Colorado State Forest Service
State Forest Service Summary of Products for Use Against Mountain
Certified Pesticide Applicators - Licensed in Cheyenne
Arborists Licensed for Tree Removal and Pruning
Ten Points on Bark Beetle Management
Detailed Information on Mountain Pine Beetle
and Ips Bark Beetle
All Photos: Cheyenne Urban Forestry
Popcorn like globs of sap or pitch
oozing out of entrance holes made by
Mountain Pine Beetle (MPB) in Scotch Pine.
Ponderosa pine showing numerous
"hits" by MPB, with sap or pitch oozing out. Not all
attacked trees will show pitch or sap around the entrance hole.
Sometimes the most visible evidence of MPB attack will be boring
dust (looks like saw dust) at the base of trees.
oozing out of entrance holes made by MPB. Open
holes in the trunk and wood boring dust mixed with sap may indicate
a successful attack.
Pine Beetle constructing the new home.
Woodpecker activity in a tree is a good indicator
of the presence of bark beetles.
Even the "bugs"
have "bugs". Mites on the back of a Mountain Pine Beetle.
Ten Points about Mountain
Pine Beetle Management:
1. Keep your pines healthy. Water trees
year-round, especially evergreens. Do not cut the tree roots.
Reduce or eliminate the use of weed killers near the tree.
Do not compact the soil around the tree. Mulch the
soil under the tree crown with coarse organic mulch, such as dry
wood chips or bark chips. ODC (Organic Disease Control) Colloidal
Chitosan can be used to enhance plant vigor. Avoid pruning pines. If pruning is required, remove dead, weak and broken limbs in late fall. Do not prune conifers February through September.
2. All pine trees over 1 inch in trunk diameter
are susceptible to attack by bark beetles including Mountain Pine
Beetle. The beetles will attack all species and sizes of pine
3. By June 1st, have
the trunks of all your pines greater than 1 inch in diameter,
sprayed with an insecticide labeled for killing or repelling mountain
pine beetle and other bark beetles (primarily, insecticides with
these active ingredients Permethrin, Carbaryl, Bifenthrin and
specifically labeled for mountain pine beetle). Spray only green,
healthy, pines that have not been attacked by Mountain Pine Beetle.
4. Remove Mountain Pine Beetle and other bark
beetle infested pine and spruce trees no later than June
1st each year. Take infested pine
trunks and limbs to the City of Cheyenne Compost Facility at 3714
Windmill Road. Limbs and trunks must
be cut into lengths of 6 feet long or less with a trunk or limb
wood diameter of 12 inches.
5. Removal and Disposal of infested trees: Tree
maintenance companies can chip smaller diameter trunk sections
and limbs. Trunks too large to chip must either have the bark
stripped off or burned by June 1st.
6. Spraying the trunks of already infested pine
trees is not an effective method of killing emerging beetles.
Standing pine trees that are successfully attacked, but still
have green or fading green to yellow needles on the branches,
will have many beetles emerge in June through September attacking
the same pine or other nearby pines.
7. Mountain pine beetle and other bark beetles
can carry blue stain fungus, which assists bark beetles in successfully
attacking a pine or spruce tree by possibly clogging the water
transport cells in the tree, and possibly providing food or nutrients
for the beetle and/or larvae.
8. Do not bring into the Cheyenne area any firewood
or store firewood from beetle killed forest trees or local trees
during the growing season, April - October.
9. Burn all firewood from beetle killed trees
before April each year.
10. Any left over firewood should have the bark
removed by June 1st. Destroy
bark containing mountain pine beetle life stages.
Detailed Information on
Mountain Pine Beetle:
pine beetle (MPB) attacks Scotch or Scots pine, Lodgepole pine,
Ponderosa pine, Limber pine, pinyon, bristlecone, and Austrian
pine. A Norway spruce found in Cheyenne, late summer 2007,
had been heavily attacked by a bark beetle. Several spruce trees
succumbed to bark beetle attack in 2010. Initially trees are attacked
by MPB and Ips bark beetle that are under stress from drought,
root or trunk damage, soil compaction, or herbicide damage. Healthier
trees are being attacked as the insect population increases in
the Cheyenne area.
your coniferous evergreen trees healthy, water them year-round.
emerge from attacked trees in mid-June through early-October.
Mid-August on average seems to be the peak emergence time
for beetles in Cheyenne. The adults fly to green pine trees
and chew a hole into the bark. Sometimes the sap oozing
out of the tree "pitches-out" the beetle. Trees
under drought stress or in poor health may not ooze sap. If the
bark beetle attack is successful, a beetle pair mates and the
female chews a vertical tunnel under the bark where up to 75 eggs
are laid. The eggs hatch and the larvae feed horizontally
away from the vertical egg gallery. The feeding of hundreds
if not thousands of larvae will girdle the tree, cutting off the
flow of food and water throughout the tree trunk. MPB adults
typically carry spores of blue stain fungus on their bodies. The
blue stain fungus helps weaken the tree by growing in tree cells
that function in water transport. Blue stain fungus may
also provide food or nutrients to the beetles and/or their larvae.
The growth of the fungus aids a successful beetle attack
by possibly slowing or stopping the sap flow in the tree. Heavily
attacked pines will not be visibly dead immediately. A dying
tree can have a green or a fading green color for up to 8 to 12
months after a MPB attack. MPB spends the winter protected under
the bark in larvae stage and sometimes in adult stage. In
the spring the larvae begin to feed again. The larvae
enter pupae stage in June and July. Adult beetles emerge
from the pupae stage and chew their way out of the tree and fly
to green pines. Several adult beetles may use the same exit
hole. In Cheyenne, Mountain Pine Beetles seem to have one
generation per year.
your evergreen trees year-round to help keep them healthy.
Hire a commercial
pesticide applicator to spray all living pines and spruces not
attacked by MPB by June 1st
with carbaryl (Sevin SL or XLR ®, and others), permethrin
(Astro®, Dragnet®, and others), or bifenthrin (Onyx®,
and others). The formulation of the pesticide used needs to be
specifically labeled for Mountain Pine Beetle control. Thoroughly
coat the tree trunk top to bottom and around the entire circumference
with the insecticide spray to the point of runoff. Some
insecticides labeled for Mountain Pine Beetle are restricted use
and must be applied by a professional spray applicator licensed
by the State of Wyoming. A spray application by June
1st should provide protection for one adult flight
period or one growing season. Permethrin insecticides may require
a second application of spray in mid to late July.
Read the entire insecticide label and follow
the directions closely before using any pesticide.
evergreen trees year-round to help keep them healthy
of Infested Wood:
beetle infested tree trunks and limbs to the City of Cheyenne
Compost Facility at 3714 Windmill Road to be chipped, destroying
the beetle habitat and most of the beetle larvae in the process.
Limbs and trunks must be cut into lengths of 6 feet long or less
with a trunk or limb wood diameter of 12 inches.
Storing or Transporting Firewood:
Ideally, pine and spruce tree trunks destined
to be firewood should have stood in place in the forest for at
least one year after the needles have fallen off of the tree (two
years after bark beetle attack), or be well seasoned or dry. Otherwise,
it should be assumed that any pine tree or spruce wood has a possible
life stage of MPB or other bark beetle under the bark. Pine and
spruce trunks with the bark peeled off can be stored as
firewood without being covered. Transporting firewood during
the adult beetle flight period, mid-June through early October,
could spread the beetle from the mountain forest to your yard.
help keep evergreen trees healthy, water them year-round.
Take all necessary precautions from spraying
your pine tree trunks to carefully selecting and storing your
firewood, or next year's firewood may come from your own yard.
Information adapted from Cheyenne Urban Forestry
experience and from articles by: Colorado
State University Extension
State University Extension
possible, take a couple of digital photos of your tree or shrub
and include them with your questions. One photo should be a close
up of the problem area. The second photo should be of the entire
tree if possible.