Mistletoe Lecture Flashcards
DMT is an obligate parasite. describe what this means.
It requires living tissue to survive. Gets all nutrition and water from Host.
What is an added threat to trees infected with DMT
The entry points of the DMT holdfasts allows for Decay Fungus Cankers to bypass tree defenses and utilize the nutrient rich wood.
If a tree has DMT on it and you are cruising, what would that imply.
Implies that the tree is suspect decay
Does a the presence of “brooms” assure the presence of DMT?
No, other pathogens can result in brooming as well.
Which host species exhibit localized brooming/swelling ?
Hw and Lw
Which host species exhibit systemic brooming?
Pl, Fd
How long do aerial shoots survive and what typically can destroy them?
3 - 5 years and are destroyed more often in areas that are subject to snow and ice. (Higher elevations, Northern latitudes)
What is the average horizontal rate of spread of DMT in an even aged stand?
0.5m - 1.0m/year
What is the avg. vertical rate of spread?
0.4m/year
Would mistletoe spread faster in a dense stand like Hw or a less dense stand like Pl?
Less density = Further seed travel, so the less dense stand has a faster rate of spread.
what does LAI stand for?
Leaf area index = density of foliage
In which part of the lifecycle of a stand is DMT spread the fastest?
Juvenile stands have a higher rate of spread due to decreased density.
What slows the rate of spread as trees mature?
- Crown closure due to
- Targets growing and getting closer as well as increasing in density.
- Shade decreases production
Obligate parasites do better on higher branches. Why?
Obligate parasites do better on highly productive branches that recieve more light.
What silvicultural technique could increase the spread of DMT?
Juvenile spacing can deliver light to infected branches that are lower in the canopy, giving the DMT a higher chance of reproducing and spreading.
