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An illustration dated 1902, showing a variety of insect pests affecting eastern white pine. Because the eastern white pine tree is somewhat resistant to fire, mature survivors are able to reseed burned areas. In pure stands, mature trees usually have no branches on the lower half of their trunks.
Many pine trees turn yellow this time of year because of normal “needle drop” on the inside branches.
Several features are used to distinguish the subgenera, sections, and subsections of pines: the number of leaves (needles) per fascicle, whether the fascicle sheaths are deciduous or persistent, the number of fibrovascular bundles per needle (2 in Pinus or 1 in Strobus), the position of the resin ducts in the needles (internal or external), the ...
The diet of adult white pine weevils consists of the needles and shoots of both pine and spruce trees. [2] Holes in the bark of a tree as a result of this feeding habit are evident as a white pine weevils will eat through the bark in order to reach the terminals. [5] Feeding occurs in the spring, when white pine weevils emerge from ...
Western white pine is a large tree, regularly growing to 30–50 metres (98–164 ft) tall. It is a member of the white pine group, Pinus subgenus Strobus, and like all members of that group, the leaves ('needles') are in fascicles (bundles) of five, [5] with a deciduous sheath. The needles are finely serrated, [5] and 5
The most infected needles are prematurely shed by December. Because the infected needles are within the interior of the tree, the newer needles on the outer surface of the pines are flushed green and resistant to the disease. However, the premature shedding of needles in the interior can extend outwards leading to a loss in overall growth.
The first instar larvae are gregarious and consume the surface layer of the needles but later instars spread out through the foliage and consume the whole needle. They feed on both old and young pine needles; [2] heavy infestations can seriously defoliate the tree and isolated clumps of white pine can be killed. [5]
White pine blister rust is the only rust of white pine. [15] Of the five needle pines, sugar pine ( Pinus lambertiana ), eastern white pine ( Pinus strobus ), and western white pine ( Pinus monticola ) are the most economically important for timber harvest and nursery stock.
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