genus of small bark beetles destructive especially to mature conifers
Mountain pine beetles and related bark beetles in the genus Dendroctonus can be distinguished from other large bark beetles in pines by the shape of the hind wing cover (Figure 1, top).
small beetle that bores tunnels in the bark and wood of trees; related to weevils
Mountain pine beetles and related bark beetles in the genus Dendroctonus can be distinguished from other large bark beetles in pines by the shape of the hind wing cover (Figure 1, top).
the immature free-living form of most invertebrates and amphibians and fish which at hatching from the egg is fundamentally unlike its parent and must metamorphose
â€Â¢ Presence of live MPB (eggs, larvae, pupae and/or adults) as well as galleries under bark.
of the insects in the chrysalis (cocoon) or post larval stage
For winter mortality to be a significant factor, a severe freeze is necessary while the insect is in its most vulnerable stage; i.e., in the fall before the larvae have metabolized glycerols, or in late spring when the insect is molting into the pupal stage.
One very effective way to kill larvae developing under the bark (though very labor intensive) is by peeling away the bark, either by hand or mechanically; this exposes the larvae to unfavorable conditions—the larvae will dehydrate, starve and eventually die.
periodic shedding of the cuticle in arthropods or the outer skin in reptiles
For winter mortality to be a significant factor, a severe freeze is necessary while the insect is in its most vulnerable stage; i.e., in the fall before the larvae have metabolized glycerols, or in late spring when the insect is molting into the pupal stage.
an organism of the kingdom Fungi lacking chlorophyll and feeding on organic matter; ranging from unicellular or multicellular organisms to spore-bearing syncytia
A key part of this cycle is the ability of MPB (and other bark beetles) to transmit bluestain fungi.
Leatherman, Colorado State Forest Service entomologist (retired); I. Aguayo, Colorado State Forest Service entomologist; and T.M. Mehall, Colorado State Forest Service forester.
recovering readily from adversity, depression, or the like
This fact sheet was produced in cooperation with the Colorado State Forest Service.
creating diversity in age and structure with result in a healthy forest that will be more resilient and, thus, less vulnerable to MPB. Most mature Colorado forests have about twice as many trees per acre as those forests which are more resistent to MPB. Contact your local forester for more information on forest management practices.
a chalcedony with alternating black and white bands; used in making cameos
Certain formulations of carbaryl (Sevin and others) permethrin (Astro, Dragnet and others), and bifenthrin (Onyx) are registered for use to prevent attacks on individual trees.
a chemical used to kill pests (as rodents or insects)
At present, there are no labeled pesticides for use on MPB.
Solar treatments may be appropriate in some areas of Colorado to reduce beetle populations in infested trees.
any of a class of solid or semisolid viscous substances obtained either as exudations from certain plants or prepared by polymerization of simple molecules
Signs and Symptoms of MPB Attack
â€Â¢ Popcorn-shaped masses of resin, called “pitch tubes,â€� on the trunk where beetle tunneling begins.
a small usually single-celled asexual reproductive body produced by many nonflowering plants and fungi and some bacteria and protozoans and that are capable of developing into a new individual without sexual fusion
Spores of these fungi contaminate the bodies of adult beetles and are introduced into the tree during attack.
hinge joint in the human leg connecting the tibia and fibula with the femur and protected in front by the patella
Mountain pine beetles and related bark beetles in the genus Dendroctonus can be distinguished from other large bark beetles in pines by the shape of the hind wing cover (Figure 1, top).
Trees that are not growing vigorously due to old age, crowding, poor growing conditions, drought, fire or mechanical damage, root disease and other causes are most likely to be attacked.
This fact sheet was produced in cooperation with the Colorado State Forest Service.
creating diversity in age and structure with result in a healthy forest that will be more resilient and, thus, less vulnerable to MPB. Most mature Colorado forests have about twice as many trees per acre as those forests which are more resistent to MPB. Contact your local forester for more information on forest management practices.
â€Â¢ Improper coverage: Spray may not have been applied high enough (up to where the trunk tapers to less that six inches), or spray coverage of the tree did not begin at ground level, or was not applied to the entire circumference of the tree (thus creating “windowsâ€� for beetle attack).
(biology) taxonomic group containing one or more species
Mountain pine beetles and related bark beetles in the genus Dendroctonus can be distinguished from other large bark beetles in pines by the shape of the hind wing cover (Figure 1, top).
using (or as if using) mechanisms or tools or devices
Trees that are not growing vigorously due to old age, crowding, poor growing conditions, drought, fire or mechanical damage, root disease and other causes are most likely to be attacked.
maintained at length without interruption or weakening
For freezing temperatures to affect a large number of larvae during the middle of winter, temperatures of at least 30 degrees below zero (Fahrenheit) must be sustained for at least five days.
a shot in billiards made by hitting the cue ball with the cue held nearly vertically; the cue ball spins around another ball before hitting the object ball
Signs and Symptoms of MPB Attack
â€Â¢ Popcorn-shaped masses of resin, called “pitch tubes,â€� on the trunk where beetle tunneling begins.
dehydrate
