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The preapical white spot similar to that on the upperside, lacks the blue outline and continus posteriorly as a transverse series of small postdiscal white spots. Additionally, there is an inner and an outer transverse series of white lunules, separated by a sinuous black line, followed by a terminal black line.
Cultivars have been selected for their shape and size, and especially for the color and pattern of the leaves. Many have white or cream-colored stems. Some have also been developed to tolerate colder temperatures. [3] The most common cultivar is 'Silver Queen', [3] which has gained the Royal Horticultural Society's Award of Garden Merit. [6] [7]
Aglaonema costatum, called the spotted evergreen, is a species of flowering plant in the genus Aglaonema, native to Bangladesh, Thailand, Peninsular Malaysia, Laos, Cambodia and Vietnam. [2] In these areas, the plant is typically found growing in the understory of tropical rain forests. [ 3 ]
Yucca filamentosa, [1] Adam's needle and thread, [2] is a species of flowering plant in the family Asparagaceae [3] native to the southeastern United States. Growing to 3 metres (10 feet) tall, it is an evergreen shrub valued in horticulture.
The narrow, needle-like, evergreen leaves are quite sharply pointed and may be dull green, blue, or pale white. [9] Each of the needles is four sided with stomata on every side, stiff, and 1.6–3 centimeters (3 ⁄ 4 – 1 + 1 ⁄ 4 in) long. [6] The needles are attached radially to their shoots, but curve upward. The leaf buds are golden ...
Leaf spots can vary in size, shape, and color depending on the age and type of the cause or pathogen. Plants, shrubs and trees are weakened by the spots on the leaves as they reduce available foliar space for photosynthesis. Other forms of leaf spot diseases include leaf rust, downy mildew and blights. [4]
Plumbago auriculata is an evergreen shrub, often grown as a climber, ascending rapidly to 6 m (20 ft) tall by 3 m (10 ft) wide in nature, though much smaller when cultivated as a houseplant. [6] The leaves are a glossy green and grow to 5 cm (2 in) long. [3] [4] The stems are long, thin, and climbing. The leaves alternate and are 2–5 cm.
Symptoms include needles developing yellow spots, horizontal brown bands around the needles, swelling of needles, and off-white fruiting bodies formed on infected needles. [ 2 ] [ 3 ] Because Cyclaneusma is an ascomycete it produces two spore types, an asexual ( conidiomata ) and sexual ( ascomycota ) spore.