وبلاگ دانشجویان مهندسی چوب دانشگاه تهران

Wood-destroying Organisms

Click on the links below or scroll down for pictures and descriptions of typical wood-destroying organisms

Subterrean Termites
Dampwood Termites
Drywood Termites
Anobiid Beetles
Wood Decay Fungus
Carpenter Ants

Subterranean Termites

This species is restricted to the West, ranging from British Columbia to Mexico.

These insects are swarmers. They are about 3/8" long including wings. Bodies are dark brown to almost black. Fontanelle (frontal gland pore) is present and they have front wings with two dark, hardened veins in the front portion. The wings are brownish gray with a few barely visible hairs. Their front wing scale is distinctly larger than the hind wing scale. Legs have a slightly darkened tibia and a pale tarsus.

Dampwood Termites

As their name implies, dampwood termites locate their colonies in damp, sometimes decaying wood. Representatives of three termite families (Kalotermitidae, Rhinotermitidae, Termopsidae) are included in this distinct habitat group. These termites vary in appearance from family to family. Almost all are larger than the eastern/western, desert subterranean termites with the nymphs being up to 3/4" (20 mm) long and the swarmers up to 1" (25 mm) long, including wings. They occur in the Pacific Coastal and adjacent states, the desert or semi-arid Southwest, and Southern Florida.

Drywood Termites

These insects live in wood which has a relatively low moisture content (12% or less), in the Western United States, Northwestern Mexico, and Florida. They are swarmers 7/16" to 1/2 " long including wings. Their heads and pronotums are orange brown, abdomens are dark brown, and wing membranes and hardened veins are blackened. They have Antenna with 10-11 segments. They are not hairy, their tibia exhibit no spines along their length and they have no pad between their claws.

Carpenter Ants

Several species of carpenter ants, Camponotus spp., are capable of damaging wood in buildings and other structures. Carpenter ants cause problems mainly in mountainous areas and in forested rural areas along the central and northern coastlines of California; they may also invade buildings in urban locations.

Anobiid Beetles

Anobiids Beetles are the most commonly encountered of the powderpost beetles. They are also called Deathwatch beetles because of a tapping sound they make when mating. Heard in the quiet of the night by people sitting with an ill person, this tapping was believed to indicate that death was near.

Adults are from 1/32 to 3/8" long. Their shape is variable but usually elongated and cylindrical. Their color is reddish brown to black, sometimes with lighter areas of pale hairs. Prothorax hoodlike enclosing head. Antennae are not symmetrical, last three segments lengthened and expanded. Larvae are white and C-shaped. Signs of infestation are round holes in wood with piles of powdery waste below.

Wood Decay Fungus

Wood Decay fungus (poria incrassata)
For a great discussion of this problem, we recommend the following web site.

More information on poria incrassata

منبع: northwesttermite

موضوع مطالب: آناتومی و حفاظت چوب - مقالات و مطالب به زبان انگلیسی

+ نوشته شده در دوشنبه بیست و سوم شهریور 1388ساعت 23:58 توسط سینا حشمتی |

Wood Anatomy

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موضوع مطالب: آناتومی و حفاظت چوب

منبع:North Carolina State University

wood anatomy in utswe

بخش جدید آناتومی چوب در بردارنده ۱۷ قسمت است که به بررسی ساختار میکروسکوپی چوب میپردازد و به تدریج در هر بار یک قسمت از آن بر روی سایت گذاشته میشود. برای ذخیره کردن هر قسمت بر روی نام موضوع راست کلیک کرده و گزینه save target as را انتخاب نمایید.

در ضمن برای دسترسی سریع به بخش Wood Anatomy میتوانید از تقسیم بندی موضوعی ویلاگ نیز استفاده نمایید .

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متن کامل

جمع آوری توسط: سینا حشمتی - سیروس نصیری

موضوع مطالب: آناتومی و حفاظت چوب

ادامه مطلب

+ نوشته شده در جمعه بیست و ششم تیر 1388ساعت 15:14 توسط سینا حشمتی |

Astragalus stella Gouhan

Morphology

therophyte 3-5cm

Ecology

mediterranean dry meadow

Chorology

SW-european

Xylem

Only one ring, vessels mostly in groups vessels thick-walled, simple perforations, round and scalariform intervessel pits, vessel diameter 40-70 µm, parenchyma paratracheal, pervasive, ray width 4-12 cells, homocellular, prostrate cells, ray cells unlignified, crystals absent.

Phloem

With ray dilatations, radial rows of sclerenchyma cells, crystals absent

موضوع مطالب: معرفی گونه

+ نوشته شده در سه شنبه هجدهم فروردین 1388ساعت 19:4 توسط سیروس نصیری |

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