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Chionaspis pinifoliae, the pine needle scale insect, is a common species of scale insect found on pine, spruce and other conifers across Canada and throughout the United States. [1] The species is particularly persistent on planted spruce in the Prairie Provinces in both rural and urban settings. In heavy populations, the needles may appear to ...
Fiorinia externa, the elongate hemlock scale, was accidentally introduced into North America from Japan and is now established in most parts of the north-eastern U.S. [2] It has become a serious pest of hemlock (Tsuga) and some related conifers from the family Pinaceae. Dense colonies of the scale insect result in yellowing, shedding of leaves ...
This fungal disease affects the needles of conifers, but is mainly found on pine. Over 60 species have been reported to be prone to infection and Corsican Pine (Pinus nigra ssp. laricio) is the most susceptible species in Great Britain. [3] It was first recorded in Britain on Corsican pine in 1954 in a nursery in Dorset.
Red band needle blight is a fungal disease which affects coniferous trees, particularly pine, with a worldwide distribution. The disease is caused by the fungi Dothistroma septosporum . Since the late 1990s its appearance in the United Kingdom has increased, among the most affected species is Corsican pine and the disease has been a significant ...
The leaves are needle-like, 7 to 25 mm (1 ⁄ 4 to 1 in) long and 1 to 1.5 mm (1 ⁄ 32 to 1 ⁄ 16 in) broad, soft, blunt-tipped, only slightly flattened in cross-section, pale glaucous blue-green above, and with two broad bands of bluish-white stomata below with only a narrow green midrib between the bands; they differ from those of any other ...
Poison hemlock is a stout, erect plant with a center stalk and light green stems and fern-like leaves that can grow up to 12 feet tall in Washington state’s temperate climate and rich volcanic ...
On older trees, it darkens and develops scales and furrows. The leaves are needle-like, flattened, 1–4.5 centimetres ( 3 ⁄ 8 – 1 + 3 ⁄ 4 in) long and 2 millimetres ( 1 ⁄ 16 in) wide by 0.5 mm ( 1 ⁄ 32 in) thick, dark green above, [ 4 ] and with two white bands of stomata below, and slightly notched at the tip. [ 6 ]
Phaeolus schweinitzii, commonly known as velvet-top fungus, dyer's polypore, dyer's mazegill, or pine dye polypore, is a fungal plant pathogen that causes butt rot on conifers such as Douglas-fir, spruce, fir, hemlock, pine, and larch. [1]