Search results
Results From The WOW.Com Content Network
Pine-pine gall rust is also an important disease for nursery owners growing pines to look out for because young trees and seedlings are particularly susceptible. Severe outbreaks in natural stands and plantations of Pinus contorta , P. ponderosa , P. banksiana , and P. sylvestris have been observed in regions of Canada .
For premium support please call: 800-290-4726 more ways to reach us more ways to reach us
Once the needles are infected, the fungus quickly destroys the tissues within the needle which is the cause for the shoot and needles to become stunted and die after only a small amount of growth. The growth of the fungus is quick and deadly to the needles, traveling “through the needle, then to the stem, and finally into adjacent needles”.
Cyclaneusma has been seen on ponderosa pines in North Dakota and Nebraska. [1] During early autumn, needles within the interior of the infected tree begin to develop yellow spots. As the fall progresses and the temperature drops, the infected needles become darker while brown horizontal bands appear on the needles’ surface. [2]
The symptoms give the disease its name. The first signs of infection that can be seen are yellow and brown spots that develop on the living needles, [7] [8] which soon turn red. This infection starts on the base of the crown on older needles, which then turn a brownish red at the tip, while the rest of the needle remains green. [9]
Pinus ponderosa, commonly known as the ponderosa pine, [3] bull pine, blackjack pine, [4] western yellow-pine, [5] or filipinus pine, [6] is a very large pine tree species of variable habitat native to mountainous regions of western North America. It is the most widely distributed pine species in North America.
Cronartium quercuum, also known as pine-oak gall rust is a fungal disease of pine (Pinus spp.) and oak (Quercus spp.) trees. Similar to pine-pine gall rust , this disease is found on pine trees but its second host is an oak tree rather than another pine.
Fusarium circinatum is a fungal plant pathogen that causes the serious disease pitch canker on pine trees and Douglas firs (Pseudotsuga menziesii).The most common hosts of the pathogen include slash pine (Pinus elliottii), loblolly pine (Pinus taeda), Monterey pine (Pinus radiata), Mexican weeping pine (Pinus patula), and Douglas fir. [1]