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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]
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 variegation of the leaves arises from the distinct white veins contrasted with the dark green of the leaf. The stems emerge from creeping rhizomes, growing 10–25 cm (4–10 in) tall. The nearly round flowers, which appear in early summer, are found on top of tall stalks. They are white or pinkish and are insect pollinated. The flowers ...
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The bands start yellow but turn brown/red and can become purple with spots on the upper or lower surface of the needle. [3] Signs of Rhabdocline pseudotsugae include apothecia that mature below epidermis where swelling is visible. These fruiting bodies are present on the underside of needles.
Reddish lesions at first then enlarges and becomes white to light brown in the centre. Circular and varying in size. Can appear concentric with red margins. Leaf spot on most cereals and grasses, field crops, vegetables, ornamentals, and trees. Myrothecium roridum: Target-like spots with light brown centres and dark circumference on Gardenia ...
Bidens alba is a species of flowering plant in the family Asteraceae, commonly known as shepherd's needles, beggarticks, Spanish needles, or butterfly needles. [1] Bidens means two- toothed, describing the two projections found at the top of the seeds, and alba refers to the white ray florets. [ 2 ]
Nothophaeocryptopus gaeumannii is a species of fungus that occurs as an endophyte inside the needles of Douglas-fir trees. It is responsible for causing the nonlethal disease known as Swiss needle cast, which results in needle loss and reduction in growth in Douglas-fir.