Biology 4218A Lecture Notes - Lecture 17: Moniliophthora Perniciosa, Mycelium, Chlorophyll
13 Dec 2016
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Abiotic disease: environmental (moisture, climate, soil), pesticide, nutritional deficiencies, mechanical means (e. g. lawnmower), water issues, ph, salinity, sunburn, wind, pollution. E. g. black lesion on tomato is b/c of: drought, widely fluctuating moisture conditions, and/or calcium deficiencies. E. g. iron deficiency causes yellowing of leaves (needed in etc) Water: too much is damaging; can hurt plants in anoxic soil; o2 starvation. Oxygen starvation: excess water in soil that it drives out oxygen, basically suffocating roots. Leaf loss goes from inside of plant out, and bottom up. Leaf scorch: necrosis of leaf edges and/or between veins. Needles of evergreens have necrosis from tips downward. Winter desiccation: dry winter winds that result in leaf water loss, and water can"t be replaced b/c soil too cold and roots can"t absorb it. Temperature: below optimal plant growth temp causes plant damage. Freeze injury caused by frost crystals inside/outside plant. Herbicides: cause chlorosis, necrosis, distortion, elongated growth.
