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Most of the breeding efforts for five-needle pine resistance are currently focused in North America, on P. strobus, P. monticola and P. lambertiana. [18] The means of resistance in rust-resistant five-needle pine varieties involve various mechanisms, such as abortion of infected leaves and slow development of canker symptoms. [7]
Pinus albicaulis is the only type of tree on the summit of Pywiack Dome in Yosemite National Park. Pinus albicaulis, known by the common names whitebark pine, white bark pine, white pine, pitch pine, scrub pine, and creeping pine, [4] is a conifer tree native to the mountains of the western United States and Canada, specifically subalpine areas of the Sierra Nevada, Cascade Range, Pacific ...
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
An elongated white scale insect, the pine needle scale feeds on the needles causing fluffy white patches on the twigs and aphids also suck sap from the needles and may cause them to fall and possibly dieback. Mites can also infest the blue spruce, especially in a dry summer, causing yellowing of the oldest needles.
The leaves ('needles') are, uniquely for a pine, usually single (not two or more in a fascicle, though trees with needles in pairs are found occasionally), stout, 4–6 cm (1 + 1 ⁄ 2 – 2 + 1 ⁄ 4 in) long, and grey-green to strongly glaucous blue-green, with stomata over the whole needle surface (and on both inner and outer surfaces of ...
The healthy pine trees were killed—especially Japanese red pine (Pinus densiflora) and Japanese Black pine (P. thunbergii). However, Jack pine (P. banksiana), Loblolly pine (P. taeda), Sugi redwood (Cryptomeria japonica), and Hinoki cypress (Chamaecyparis obtusa) trees were able to survive. [7] In 1971, the researchers concluded that the ...
Pinus dalatensis is a medium-sized evergreen tree growing to 30 to 40 metres (98 to 131 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, with a deciduous sheath. The needles are finely serrated, and (3-)5–14 cm long.
Pinus pungens is a tree of modest size (6–12 metres or 20–39 feet), and has a rounded, irregular shape. The needles are in bundles of two, occasionally three, yellow-green to mid green, fairly stout, and 4–7 centimetres (1 + 1 ⁄ 2 –3 in) long. The pollen is released early compared to other pines in the area which minimizes hybridization.