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Agathis robusta is a large evergreen tree with a straight cylindrical trunk, which can often reach a height of 30–40 m (98–131 ft), and occasionally 50 m (160 ft). [5] [6] [7] The trunk is usually about 1.2 m (3 ft 11 in) diameter at breast height (DBH), but occasionally may reach 3 m (9.8 ft). [5]
The best evergreen trees include many more options than Christmas trees and needle-shedding pines. Just like annuals and perennials, evergreens come in a variety of shapes, sizes, and colors.
The needles are eaten by some lepidopteran caterpillars, for example the Io moth (Automeris io). Abies balsamea is one of the most cold-hardy trees known, surviving at temperatures as low as −45 °C (−49 °F) (USDA Hardiness Zone 2). Specimens even showed no ill effects when immersed in liquid nitrogen at −196 °C (−320.8 °F). [11]
Infected trees are often identified by "flagging", when all the needles on a branch turn brown and die. Infections often occur on low branches close to the ground on young trees, so pruning of white pine can also be effective in multiple ways, as it improves the quality of timber by creating more knot-free timber, and reduces the likelihood of ...
These beetle species grind through conducting tissues of their hosts. Phloem damage leads pine needles fading from green, to light green, and death of the tree. [26] These trees also face the eastern pine weevil and are susceptible to wind damage. [2] Pinus serotina also faces red heart disease (Phellinus pini), a fungal disease of pines. [27]
Evergreen . In botany, an evergreen is a plant which has foliage that remains green and functional throughout the year. [1] This contrasts with deciduous plants, which lose their foliage completely during the winter or dry season. Consisting of many different species, the unique feature of evergreen plants lends itself to various environments ...
Yews are small to medium-sized evergreen trees, growing 10–20 m (35–65 ft) (exceptionally up to 28 m or 92 ft) tall, with a trunk up to 2 m (6 ft 7 in) (exceptionally 4 m or 13 ft 1 in) in diameter. The bark is thin, scaly brown, and comes off in small flakes aligned with the stem.
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