Oct 23

Don't Invite Them In

Posted on October 23, 2019 at 1:04 PM by Alicia Doran

Fall is the time of year that mice and rats are looking for a place to be protected from the elements.  

Ways to Discourage Rodents
  • Keep food in sealable containers
  • Remove trash and garbage from inside your home
  • Remove vegetation and leaves from the perimeter of your home
  • Keep compost piles away from your home
  • Don’t leave pet food outside
  • Clean up any spilled birdseed from around bird feeders
  • Fill any cracks, openings or voids around your home 
Prevention is your best defense!

Aug 01

Douglas Fir Tussock Moth

Posted on August 1, 2019 at 8:45 AM by Alicia Doran

Doug Fir Tussock Moth - caterpillar

Douglas Fir Tussock Moth

Douglas fir tussock moth (DFTM) is a native insect whose populations are increasing in the southern portion of Jefferson County. In 2016 we saw over 24,000 acres defoliated near the Buffalo Creek area. According to the Colorado State Forest Service many of those trees will recover. Landowners in the affected area should monitor their properties and not move items infested with DFTM.

At this time of year DFTM is overwintering in the egg stage.
Landowners in the forested areas in southern Jeffco should be looking for egg masses now to determine if there is a possibility for large numbers of DFTM on their properties. Egg masses can be found on branches and the trunks of trees. The eggs are in a mass of very small pearl like eggs surrounded by grayish brown hairs. The eggs will hatch into very small caterpillars around late May, at the same time the trees will begin to bud. Landowners may decide to treat their trees if they find large numbers of egg-masses. The time to treat is in early spring when trees are growing new needles and the caterpillars first emerge Treatment is not effective after they get larger than about ¼ inch long.
?Treatment is not always necessary if the landowner can tolerate some impact to their trees. DFTM populations tend to subside within a few years. Trees will sometimes rebound but weakened trees may be attacked by bark beetles such as the Douglas-fir bark beetle or Ipps beetle. The Colorado State Forest Service has recently published a factsheet
Jul 27

Western Spruce Budworm

Posted on July 27, 2019 at 5:04 PM by Alicia Doran

We are seeing an outbreak of Western Spruce Budworm in the southern part of the county in the Foxton area.

Western Spruce Budworm (WSBW) is a native moth with one generation a year.  In recent years, Colorado has seen an increase in WSBW outbreaks.  In 2018, CSFS had seen about 150 acres affected in Jeffco.  WSBW defoliates the branch tips of Douglas-fir, true fir (e.g., subalpine fir and white fir) and spruce trees.

Repeated defoliations may kill the tree or make it more susceptible to other insects.  High value trees may be treated with insecticide early when the larva first emerge (mid-May) but forest-wide treatment is usually not a recommended option.  Link to Fact Sheet


Western_spruce_budworm_larva  Western_spruce_budworm_damage