Douglas-fir dwarf mistletoe

by James S. Hadfield

Publisher: U.S. Dept. of Agriculture, Forest Service in [Washington, D.C.?]

Written in English
Published: Downloads: 367
Share This


  • Douglas fir -- Diseases and pests -- West (U.S.),
  • Douglas fir -- Diseases and pests -- Canada

Edition Notes

Other titlesDouglas fir dwarf mistletoe.
StatementJames S. Hadfield, Robert L. Mathiasen, and Frank G. Hawksworth.
SeriesForest insect & disease leaflet -- 54.
ContributionsMathiasen, Robert L., Hawksworth, Frank G., 1926-, United States. Forest Service.
The Physical Object
Pagination9 p. :
ID Numbers
Open LibraryOL17595161M

dwarf mistletoe (countable and uncountable, plural dwarf mistletoes) Any mistletoe of the New World genus Arceuthobium, that parasitize conifers. Derived terms [ edit ]. Abstract Douglas‐fir dwarf mistletoe (Arceuthobium douglasii) is a prevalent species in southwestern mixed‐conifer forests, affecting host trees by reducing growth and seed production and increasing mortality. Dwarf mistletoe infections can also form witches' brooms, which are profusely branched, dense masses of distorted host branches in the crowns of infected trees. Description: Douglas-fir dwarf-mistletoe is an obligate parasite with stems mostly cm long and less than 2 mm thick. It is characteristically found on Douglas-fir, producing witches' brooms. Its flattened, olive-green stems are concentrated near the tip of the host-stem branch and are arranged in 1 plane to produce a fan-like appearance.   Douglas-fir dwarf mistletoe (Arceuthobium douglasii) is one of the most serious pathogens of Douglas-fir (Pseudotsuga menziesii) in the western United States and Canada (Hadfield et al., ). This mistletoe is distributed from southern British Columbia through much of the western United States into northern Mexico.

Schellhaas said Douglas fir trees are more likely to be infected by mistletoe and to exacerbate fires than ponderosa pines, the other main tree species on the mountain, Mayor Jill Thompson told the Town Council at the July 20 meeting. For example, Douglas fir dwarf mistletoe lives only on Douglas fir. The same is true for mistletoe infecting ponderosa pine and lodgepole pine. Larch dwarf mistletoe sometimes infects subalpine fir and lodgepole pine. The best way to identify mistletoe is to observe the plants. Some species of mistletoe . N2 - We evaluated wildlife use of witches' brooms associated with infection by Douglas-fir dwarf mistletoe (Arceuthobium douglasii) in 6 mixed-conifer study areas in Arizona and 2 areas in New Mexico. We climbed infected Douglas-firs (Pseudotsuga menziesii) and examined witches' brooms for evidence of wildlife use. Rating Content; Neutral: On , frostweed from Josephine, Arlington, TX (Zone 8a) wrote: Douglas Fir Dwarf Mistletoe, Arceuthobium douglasii, is native to Texas and other States.

Douglas-fir dwarf mistletoe (Arceuthobium douglasii) is a parasitic flowering plant that infects Douglas-fir (Pseudotsuga menziesii) throughout the western United States. Douglas-fir dwarf mistletoe induces the formation of witches' brooms on infected trees which alters the biomass and architecture of branches of the infected host.

Douglas-fir dwarf mistletoe by James S. Hadfield Download PDF EPUB FB2

See: Oak (Quercus spp.)-Mistletoe (a True Mistletoe) Cause Several Arceuthobium spp., parasitic plants, attack important forest species in the PNW. Dwarf mistletoe is an important disease of Douglas-fir (attacked by Arceuthobium douglasii) in southern and eastern Oregon.

Arceuthobium douglasii has also been found occasionally on Pacific silver fir and rarely on grand fir and subalpine fir.

Print book: National government publication: English: Rating: (not yet rated) 0 with reviews - Be the first. Subjects: Douglas fir -- Diseases and pests -- Washington (State) Douglas fir -- Diseases and pests -- Oregon. Dwarf mistletoes. View all subjects; More like this: Similar Items.

Stems olive-green, 3–20 mm long, often forming lines on the twigs. Berry green, 3–5 mm long (Lesica Manual of Montana Vascular Plants. BRIT Press.

Douglas-fir dwarf mistletoe occurs in roughly one-half of the mixed conifer acreage in the region. Other species of dwarf mistletoe have more limited distributions (see table).

Hosts: See table (below) Symptoms/signs: Aerial shoots of dwarf mistletoe plants vary by species in size, color, and pattern of branching. For example, southwestern. Hadfield JS; Flanagan PT, Dwarf mistletoe pruning may induce Douglas-fir beetle attacks.

Western Journal of Applied Forestry, 15(1); 16 ref. Hawksworth FG, Rate of spread and intensification of dwarf mistletoe in young Lodgepole Pine stands. Journal of Forestry, Hawksworth FG, The 6-class dwarf mistletoe.

Arceuthobium douglasii is a species of dwarf mistletoe known as Douglas fir dwarf is native to western North America from British Columbia to Texas to California, where it lives in forest and woodland as a is found mostly on Douglas fir (Pseudotsuga menziesii) trees, but occasionally on fir (Abies spp.), as well.

This greenish shrub is visible as a network of scaly. Introduction. This study was established in to measure Douglas-fir dwarf mistletoe (Arceuthobium douglasii) spread, intensification, and impact on Douglas-fir (Pseudotsuga menziesii) growth and mortality in pre-commercially thinned stands.

All plots were located near the South Fork of Lolo Creek, Lolo National Forest, Montana on a Douglas-fir/Ninebark Habitat Type.

Most dwarf mistletoes are native to western North America, from Alaska south through the western United States, Mexico and Central America.

Dwarf mistletoe, a common problem in Colorado forests, predominantly affects ponderosa and lodgepole pines, although they Douglas-fir dwarf mistletoe book attack Douglas-fir, piñon, limber and bristlecone pines.

A parasitic plant sometimes utilizing P. menziesii is Douglas Fir dwarf mistletoe (Arceuthobium douglasii). The leaves are also used by the woolly conifer aphid Adelges cooleyi; this mm long sap-sucking insect is conspicuous on the undersides of the leaves by the small white "fluff spots" of protective wax that it produces.

This is an original press photo. Twisted spriglets of dwarf mistletoe grow between the toothpick-like needles of a Douglas fir; sapping the tree of its energy.

Delbert Wiens, a University of Utah biology professor, holds a clump of dwarf mistletoe in front of an infested Douglas fir Seller Rating: % positive. pression of dwarf mistletoe populations was achieved by these early treatments in many cases.

In the early 's, and at several intervals thereafter, chem.-icals were tested to control dwarf mistletoes on both timber producing and recreational areas (Quick ). Unfortu-nately, no successful chemical control of dwarf mistletoe was found. Douglas-fir, pinon and limber pine are damaged in some parts of the state.

Nursery and ornamental plantings seldom are affected; but the parasite can be introduced into an area by planting trees already infected with dwarf mistletoe. Dwarf mistletoe is a small, leafless, parasitic flowering plant (Figure 1. The effect of dwarf mistletoe infection on Douglas-fir diameter growth continued to follow the trends observed after the ten year re-measurement.

Diameter growth of lightly infected Douglas-firs (bvr ) was no different than that of uninfected Douglas-firs, but was slightly less in trees with bvr 3 and continued to decline for trees with. douglasii (Douglas-fir dwarf mistletoe) • Douglas-fir: Ave = m (10 ft) Throughout eastern Oregon, Washington, and portions of southwest Oregon.

Generally uncommon in the Coast Range, or north of the Oregon Calapooya Divide on the west slopes of the Cascades. Effects for a given DMR are greater than other mistletoes. Produces very. COVID Resources. Reliable information about the coronavirus (COVID) is available from the World Health Organization (current situation, international travel).Numerous and frequently-updated resource results are available from this ’s WebJunction has pulled together information and resources to assist library staff as they consider how to handle coronavirus.

Douglas-fir dwarf mistletoe Arceuthobium douglasii Englem. About This Subject; View Images Details; View Images; Image subid Scientific Name Common Name Autid photographer Org Baseimgurl landscape Description; Forestry Images is a.

Insects. Bark beetles. Douglas-fir beetle Furniss, M.M.; and Kegley, S.J. Douglas-fir beetle. Forest Insect & Disease Leaflet 5 (revised). USDA Forest. Pseudotsuga menziesii var.

menziesii, also known as Coast Douglas-fir, Pacific Douglas-fir, Oregon pine, or Douglas spruce, is an evergreen conifer native to western North America from west-central British Columbia, Canada southward to central California, United Oregon and Washington its range is continuous from the Cascades crest west to the Pacific Coast Ranges and Pacific Ocean.

that the rate at which Douglas-fir dwarf mistletoe infections increased depended on tree diameter and mistletoe abundance. Mathiasen et al. () found that tree growth decreased and the level of mortality increased as dwarf mistletoe infection in Douglas-fir increased.

The. canopy light and the distribution of hemlock dwarf mistletoe (arceuthobium tsugernse [rosendahl] g.n. jones subsp.

tsugense) aerial shoots in an old-growth douglas-fir/western hemlock forest [shaw, david c & weiss, stuart b] on *free* shipping on qualifying offers. canopy light and the distribution of hemlock dwarf mistletoe (arceuthobium tsugernse [rosendahl] g.n.

jones : Stuart B Shaw, David C & Weiss. ac/yr annual loss Arceuthobium bark beetles black spruce acres California Region caused by dwarf CD CD CD CL CM CM CM r-l commercial black spruce commercial forest land Continental Divide cubic foot volume cubic-foot volume loss Douglas-fir and Western due to dwarf dwarf mistletoe caused dwarf mistletoe National Edminster Estimate of.

Douglas-fir dwarf mistletoe: A. douglasii Hosts: Douglas-fir, occasionally corkbark fir. Distribution: Throughout most of the host range in Arizona and New Mexico, northward into Canada and south into Mexico. The smallest species of dwarf mistletoe in western North America, but.

We investigated the distribution and severity of trees infected with western hemlock dwarf mistletoe (Arceuthobium tsugense (Rosendahl) G.N. Jones subsp. tsugense) in an old-growth Douglas-fir (Pseudotsuga menziesii (Mirb.)Franco) western hemlock (Tsuga heterophylla (Raf.)Sarg.) forest.

Douglas-fir dwarf mistletoe, Arceuthobium douglasii Engelm., is a destructive native parasite of Douglas-fir and is the primary disease agent affecting this tree over most of its range. With the exceptions noted below, its distribution essentially coincides with that of Douglas-fir from southern British Columbia to central Mexico.

The. Douglas-fir dwarf mistletoe Arceuthobium douglasii Douglas-fir white fir, subalpine fir, Engelmann spruce, blue spruce Primary Host: Pseudotsuga menzeisii Occasional Hosts: Abies concolor, Abies lasiocarpa, Picea engelmannii, Picea pungens Shoots are olive green, mean shoot height 2 cm, with fan-like branching, fruit is an ovoid berry, olive green/.

Take a video tour of Bogus Basin Mountain Recreation Area’s dying trees. The ski area near Boise, Idaho, is losing most of its Douglas fir trees to a combination of dwarf mistletoe and bark beetles. A parasitic plant sometimes utilizing P. menziesii is Douglas-fir dwarf mistletoe (Arceuthobium douglasii).

The leaves are also used by the woolly conifer aphid Adelges cooleyi ; this mm long sap -sucking insect is conspicuous on the undersides of the leaves by the small white "fluff spots" of protective wax that it produces.

(Douglas-fir dwarf mistletoe) • Douglas-fir: Ave = m (10 ft) Throughout eastern Oregon, Washington, and portions of southwest Oregon. Generally uncommon in the Coast Range, or north of the Oregon Calapooya Divide on the west slopes of the Cascades.

Effects for a given DMR are greater than other mistletoes. Spraying for Mistletoe on Pine Trees. Dwarf mistletoe (Arceuthobium spp.) is a big problem in Douglas County, with many older properties full of infestation that can easily be transferred over to healthier new trees on your property.

Mistletoe removal is a challenging task. Spraying for Mistletoe on pine trees gives you an option to get to this parasite in hard to reach areas. – Douglas-fir dwarf mistletoe Subordinate Taxa. This plant has no children Legal Status.

Wetland Status. Interpreting Wetland Status. Related Links. More Accounts and Images; ARS Germplasm Resources Information Network (ARDO) Integrated Taxonomic Information System (ARDO).

Call Us: Toggle menu. Search ; USD.Douglas-fir dwarf mistletoe occurs only west of the Continental Divide. Ponderosa pine dwarf mistletoe is found near Coeur d'Alene, Idaho.

Damage. Witches brooms often form on infected branches (figs. 76, 77). Stem cankers or swellings sometimes result from stem infections by dwarf mistletoe. Height and diameter growth reductions Identification.affecting dwarf mistletoe population dynamics.

In terms of acres affected, the major tree species impacted by dwarf mistletoes in the Northern and Intermountain Regions are lodgepole pine, Douglas-fir, and western larch (See page 11). Features of dwarf mistletoes that make them relatively easy to .