WDF Flashcards
White rot is defined as:
a. Decay fungi that breaks wood. It can be recognized by its papery mycelial fans and root-like rhizomorphs.
b. Decay fungi that breaks wood into small cubical pieces with cracks perpendicular to the wood grain. Wood is
brown and crumbly. The wood shrinks abnormally upon drying.
c. Decay fungi that destroys the cell walls. The wood is lighter than normal in color and is stringy when broken and
feels spongy to the touch. There is no abnormal shrinkage.
d. Colored mycelia give the wood a gray or bluish color that cannot be removed by sanding. The wood is decayed.
e. Colored fruiting bodies may have a pink, yellow, green, gray, or black powdery appearance. The wood is not
destroyed.
Decay fungi that destroys the cell walls. The wood is lighter than normal in color and is stringy when broken and
feels spongy to the touch. There is no abnormal shrinkage.
Brown rot is defined as:
a. Decay fungi that breaks wood. It can be recognized by its papery mycelial fans and root-like rhizomorphs.
b. Decay fungi that destroys the cell walls. The wood is lighter than normal in color and is stringy when broken and
feels spongy to the touch. There is no abnormal shrinkage.
c. Colored mycelia give the wood a gray or bluish color that cannot be removed by sanding. The wood is decayed.
d. Colored fruiting bodies may have a pink, yellow, green, gray, or black powdery appearance. The wood is not
destroyed.
e. Decay fungi that breaks wood into small cubical pieces with cracks perpendicular to the wood grain. Wood is
brown and crumbly. The wood shrinks abnormally upon drying.
Decay fungi that breaks wood into small cubical pieces with cracks perpendicular to the wood grain. Wood is brown and crumbly. The wood shrinks abnormally upon drying.
Mildew is defined as:
a. Colored fruiting bodies may have a pink, yellow, green, gray, or black powdery appearance. The wood is not destroyed.
b. Decay fungi that destroys the cell walls. The wood is lighter than normal in color and is stringy when broken and feels spongy to the touch. There is no abnormal shrinkage.
c. Decay fungi that breaks wood. It can be recognized by its papery mycelial fans and root-like rhizomorphs.
d. Colored mycelia give the wood a gray or bluish color that cannot be removed by sanding. The wood is decayed.
e. Decay fungi that breaks wood into small cubical pieces with cracks perpendicular to the wood grain. Wood is brown and crumbly. The wood shrinks abnormally upon drying.
Colored fruiting bodies may have a pink, yellow, green, gray, or black powdery appearance. The wood is not destroyed.
Sap-staining fungi are defined as:
a. Decay fungi that breaks wood into small cubical pieces with cracks perpendicular to the wood grain. Wood is
brown and crumbly. The wood shrinks abnormally upon drying.
b. Decay fungi that breaks wood. It can be recognized by its papery mycelial fans and root-like rhizomorphs.
c. Colored mycelia give the wood a gray or bluish color that cannot be removed by sanding. The wood is not
decayed.
d. Decay fungi that destroys the cell walls. The wood is lighter than normal in color and is stringy when broken and
feels spongy to the touch. There is no abnormal shrinkage.
e. Colored fruiting bodies may have a pink, yellow, green, gray, or black powdery appearance. The wood is not
destroyed.
Colored mycelia give the wood a gray or bluish color that cannot be removed by sanding. The wood is not decayed.
Which is NOT a characteristic of decay fungi?
a. Attach sapwood and heartwood of most tree species.
b. Fruiting bodies may be mushrooms, shelf-like brackets, or crusty, flattened structures.
c. Early decay is more easily noted on weathered, discolored wood than on freshly exposed unseasoned wood
Early decay is more easily noted on weathered, discolored wood than on freshly exposed unseasoned wood
This wood decay fungi usually attacks green wood:
a. Brown rot.
b. Soft rot.
c. White rot.
Soft rot.
This wood decay fungi are the most important of soft woods used in aboveground construction:
a. Brown rot.
b. Soft rot.
c. White rot.
Brown rot.
The symptom of this wood decay fungi includes excessive shrinkage and cross-grain cracking of wood.
a. Brown rot.
b. Soft rot.
c. White rot.
Brown rot
The effect of this wood decay fungi breaks down both lignin and cellulose:
a. Brown rot.
b. Soft rot.
c. White rot.
White rot.
Wood infected with this fungus can be greatly weakened before decay is visible:
a. Brown rot.
b. Soft rot.
c. White rot.
Brown rot.
Wood infected with this wood decay fungi shows normal shrinkage, does not collapse or crack across the grain, and loses strength gradually until spongy to the touch:
a. Brown rot.
b. Soft rot.
c. White rot.
White rot
Wood infected with this wood decay fungi are easily crushed to a brown powder:
a. Brown rot.
b. Soft rot.
c. White rot.
Brown rot.
This wood decay fungi includes a few fungi that can infect relatively dry wood because of water-conducting strands:
a. Brown rot (Poria).
b. Soft rot.
c. White rot.
Brown rot (Poria).
This wood decay fungi breaks down cellulose, but not lignin:
a. Brown rot.
b. Soft rot.
c. White rot.
Brown rot
“Dry rot” refers to brown rot fungi (Poria) infecting completely dry wood.
a. True
b. False
False
