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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 ]
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]
The exact temperature which evergreen roots can handle depends on the species, for example, Picea glauca (White Spruce) roots are killed at −10 °F (−23 °C). [7] In areas where there is a reason for being deciduous, e.g. a cold season or dry season, evergreen plants are usually an adaptation of low nutrient levels.
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 ]
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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Prickles on a blackberry branch. In plant morphology, thorns, spines, and prickles, and in general spinose structures (sometimes called spinose teeth or spinose apical processes), are hard, rigid extensions or modifications of leaves, roots, stems, or buds with sharp, stiff ends, and generally serve the same function: physically defending plants against herbivory.
Rhytisma acerinum is the teleomorph of tar spot. In the spring, needle-shaped ascospores are released from overwintering apothecia in fallen leaf debris. [2] [7] These spores are disseminated by the wind and have a sticky coat to attach to new healthy leaves. [4] Once on the leaves, the spores germinate and penetrate through the stoma. [2]
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