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The undersides of leaves have spots that look water-soaked or gray, and as they expand, blight forms and the leaf is destroyed within a few days. [2] Symptoms occur in a day/night pattern where water soaked areas expand during the night and then dry out during the day. As a result, additional water marks form leading to increasingly larger lesions.
A COLE value of 0.06 means that 100 inches of soil will expand by 6 inches when wet. [2] Soils with this shrink-swell capacity fall under the soil order of Vertisols . [ 6 ] As these soils dry, deep cracks can form on the surface, which then allows water to penetrate to deeper levels of the soil. [ 7 ]
Expansive clays have an expanding crystal lattice in a 2:1 ratio; however, there are 2:1 non-expansive clays. [2] Mitigation of the effects of expansive clay on structures built in areas with expansive clays is a major challenge in geotechnical engineering. Some areas mitigate foundation cracking by watering around the foundation with a soaker ...
The symptoms of Drechslera leaf spot are mostly small, dark-brown, or purplish spots on the leaves. [1] The spots eventually expand and become lighter-brown or ashy in the middle (usually having dark margins around the center). Once the spots run together, girdling of the entire leaf blade occurs.
Late blight of potato, caused by the water mold Phytophthora infestans (Mont.) de Bary, the disease which led to the Great Irish Famine; Southern corn leaf blight, caused by the fungus Cochliobolus heterostrophus (Drechs.) Drechs, anamorph Bipolaris maydis (Nisikado & Miyake) Shoemaker, incited a severe loss of corn in the United States in 1970 ...
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Causally known as Sclerotial blight, [4] Agroathelia rolfsii survives in the soil as sclerotia, and in infected decomposing plant material as mycelia. [5] Collar rot that is caused by the oomycete Phytophthora is causally called Phytophthora collar rot, and is a common disease of fruit and nut trees, [5] [6] as well as other flowers [7] and crops.
Acne symptoms and signs. Acne blemishes are most common on the face, chest, back, shoulders and neck, but they can appear almost anywhere. With acne, you might have pimples, blackheads, papules ...