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Septoria lycopersici infects the tomato leaves via the stomata and also by direct penetration of epidermal cells. [3] Symptoms generally include circular or angular lesions most commonly found on the older, lower leaves of the plant. [1] The lesions are generally 2–5 mm in diameter and have a greyish center with brown margins.
A characteristic useful for identification is that the young leaves emerge downy on the underside. The fall color is variable, from orange-yellow to pinkish or reddish. [5] [6] Flower details. It has perfect flowers that are 15–25 mm (5 ⁄ 8 –1 in) in diameter, with 5 petals, emerging during budbreak in early spring. The petals are white.
Other symptoms include stunting, chlorosis or yellowing of the leaves, necrosis or tissue death, and defoliation. Internal vascular tissue discoloration might be visible when the stem is cut. [2] In Verticillium, the symptoms and effects will often only be on the lower or outer parts of plants or will be localized to only a few branches of a ...
Amelanchier (/ æ m ə ˈ l æ n ʃ ɪər / am-ə-LAN-sheer), [1] also known as shadbush, shadwood or shadblow, serviceberry or sarvisberry (or just sarvis), juneberry, saskatoon, sugarplum, wild-plum [2] or chuckley pear, [3] is a genus of about 20 species of deciduous-leaved shrubs and small trees in the rose family .
Yellowing (Chlorosis) occur in the newly emerging leaves instead of the older leaves and usually seen in the interveinal region. Fruit would be of poor quality and quantity. Chlorosis occurs in younger leaves because iron is not a mobile element, and as such, the younger leaves cannot draw iron from other areas of the plant.
The youngest leaves show chlorosis (yellowing), dwarfing and malformation. Visible deficiency symptoms include: [3] Chlorosis - yellowing of leaves; often interveinal; in some species, young leaves are the most affected, [4] but in others both old and new leaves are chlorotic; [3] [5] Necrotic spots - death of leaf tissue on areas of chlorosis;
The disease starts out as yellowing and drooping on one side of the plant. Leaf wilting, plant stunting, browning of the vascular system, leaf death and lack of fruit production also occur. [8] F. oxysporum f. sp. melonis attacks muskmelon and cantaloupe. It causes damping-off in seedlings and causes chlorosis, stunting and wilting in old plants.
The leaves are oval to nearly circular, 2–5 centimetres (3 ⁄ 4 –2 inches) long and 1–4.5 cm (1 ⁄ 2 – 1 + 3 ⁄ 4 in) broad, on a 0.5–2 cm (1 ⁄ 4 – 3 ⁄ 4 in) leaf stem, with margins toothed mostly above the middle. [5] As with all species in the genus Amelanchier, the flowers are white, [6] with five quite separate petals and ...