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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]
Pycnidia can be found in the center of the said lesions. Pycnidia are fruiting bodies of the fungus. When the lesions become numerous often the leaves turn yellow, then brown, shriveling up and eventually dropping off the plant altogether. [1] Tomato leaf with septoria leaf spot symptoms of dark spots and yellow surrounding region
The basal leaves are much more numerous with the 7–30 centimeter long leaf stems [3] spreading in every direction to from a rounded tuft of leaves. [2] Each leaf is made up of 8–13 small leaflets, [ 3 ] each leaflet is 4–8 centimeters long and rarely less than 10 millimeters wide. [ 4 ]
Pyrenophora tritici-repentis and Drechslera tritici-repentis is a necrotrophic plant pathogen of fungal origin, phylum Ascomycota. [1] The pathogen causes a disease originally named yellow spot but now commonly called tan spot, yellow leaf spot, yellow leaf blotch or helminthosporiosis.
Lupinus excubitus is a small shrub with gray-green foliage. The fan-shaped leaves are borne on the stem and may be clustered at the base. Generally covered with silvery hairs, each is made up of 7 to 10 narrow 5–50 millimetres (0.2–2.0 in) leaflets. The raceme inflorescence is a tall stalk of rich purple flowers, each with a bright yellow spot.
While these plants are relatively low maintenance, it’s not unusual for peace lily leaves to turn yellow here and there due to stress, pests, or other issues. This guide explains the most common ...
Lupinus polyphyllus, the large-leaved lupine, big-leaved lupine, many-leaved lupine, [2] blue-pod lupine, [3] or, primarily in cultivation, garden lupin, is a species of lupine (lupin) native to western North America from southern Alaska and British Columbia [4] and western Wyoming, and south to Utah and California.
Lupinus lepidus is a small hairy perennial that reaches 10 to 61 centimetres (4 to 24 inches). [3] Palmately compound leaves extend up the stem, but most are basal . [ 3 ] The inflorescence is a dense spike-like raceme , with pink, purple, or blue flowers that often have a yellowish spot. [ 3 ]