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In systematic virus infections leaf spots caused by viruses show a loss of green colour in leaves, due to chlorosis which is a repression of chlorophyll development. [1] Leaves may yellow and have a mottled green or yellow appearance, show mosaic (e.g. chlorotic spotting) and ringspots (chlorotic or necrotic rings). [7]
Salvia rosmarinus (/ ˈ s æ l v i ə ˌ r ɒ s m ə ˈ r aɪ n ə s /), [3] [4] commonly known as rosemary, is a shrub with fragrant, evergreen, needle-like leaves and white, pink, purple, or blue flowers. It is a member of the sage family, Lamiaceae.
Overwatering and underwatering are, hands down, the most common causes of peace lily leaves turning yellow, and these two issues can cause leaf drop and wilting, too.
The spots, which may be as much as 12 mm across, are generally circular and have an irregular edge often with a yellow halo. Leaves frequently turn yellow and fall early. Sometimes new leaves are produced, and these may also become affected. Continual defoliation will cause weakness, dieback or death of the plant. Some very susceptible species ...
The frequency of fire in scrub depends, in part, on the productivity of the soil. Sites with very poor soil tend to support rosemary scrubs (sometimes called "rosemary balds"), which rarely burn. The death of older rosemary bushes leaves open spots where new rosemary seedlings or sand pine seedlings may start growing.
The growth form is a rounded shrub with dense branching. Dark green leaves are needle-like, eight to twelve mm long and one mm wide, and smell like the herb rosemary. The yellow to brown flowers are small. The green or yellow fruit is 3 millimetres (1 ⁄ 8 in) in diameter, and is a juicy drupe containing two seeds. [7]
The reddish stems of this herbaceous perennial are usually simple, erect, smooth, 0.5–2 metres (1 + 1 ⁄ 2 – 6 + 1 ⁄ 2 feet) high with scattered alternate leaves. [2] The leaves are spirally arranged, entire, narrowly lanceolate, and pinnately veined, the secondary leaf veins anastomosing, joining together to form a continuous marginal vein just inside the leaf margins. [3]:
Mycosphaerella musicola was first reported from Java in 1902 and by 1962 was found in most banana growing regions of the world. Although it is spread over short distances by conidia and ascospores, over long distances it is the movement of infected germplasm such as diseased leaves and suckers that is likely to be responsible.