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Scorching occurs with atmospheric pollution, inappropriate irrigation, nutrient deficiency, root failure, and vascular disease.

Specifically, an sulfur dioxide-laden atmosphere causes foliage to "burn." Overhead watering encourages leaves to "scorch" while drying in the sun. The lack of certain nutrients, such as boron, is identifiable by the sun-dried look of leaf margins. Problems in oxygen intake from compacted or filled soil, gas leaks, overwatering, and root knot nematodes may change the soil pH, make certain nutrients such as aluminum unavailable, and obstruct intake of moisture and nutrients from the soil. Fusarium, oak and verticillium wilt plug the entry points for soluble nutrients to enter and circulate through the plant for life-sustaining activities.

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11y ago

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