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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]
The pathogen causes a disease originally named yellow spot but now commonly called tan spot, yellow leaf spot, yellow leaf blotch or helminthosporiosis. [2] [3] At least eight races of the pathogen are known to occur based on their virulence on a wheat differential set. [4] The tan (yellow) spot fungus was first described by Nisikado in 1923 in ...
An array of leaves encircles the base. Each palmate leaf is made up of 6 to 8 leaflets about a centimeter long and a few millimeters in width. The inflorescence is a petite spiral of flowers a few centimeters long just arising past the basal disc of leaves. Each flower is 6 to 8 millimeters long and bright blue in color, generally with a white ...
It has green to gray-green palmate leaves, with 5–12 leaflets per leaf. The leaflets are 2–6 centimetres (0.79–2.36 in) long, often sparsely covered with fine silky hairs. In spring it bears many racemes, 30 cm (12 in) long, of fragrant, soft yellow, pea-like flowers. [1] [2] Both yellow and lilac to purple flowering forms are known ...
Lupinus argenteus plant, with silvery leaves. Lupinus argenteus is a species of lupine known by the common name silvery lupine. [2] It is native to much of western North America from the southwestern Canadian provinces to the southwestern and midwestern United States, where it grows in several types of habitats, including sagebrush, grassland, and forests.
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 flavoculatus is a small, hairy annual herb growing up to about 20 centimetres (7.9 in) tall. Each palmate leaf is made up of 7 to 9 leaflets 1 or 2 centimeters long. The inflorescence is a small, dense spiral of flowers each roughly a centimeter long. The flower is bright to deep blue with a yellowish spot on its banner.
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 ]