Water during this period if seasonal rains are not adequate or during the winter when the soil is not frozen. It is very important for the trees, especially broadleaf and needled evergreens, to be well watered going into the winter period. Soil should be moist to a depth of 10 to 12 inches after a thorough watering. Plant in a fertile, well-drained soil at the same depth the plants grew in at the nursery and with an adequate supply of organic matter. Water when needed and maintain plant vigor. Scorch can also reduce the health of a plant making it more susceptible to attack by insects and diseases.ġ. In some cases, insect damage such as leafhopper (hopper burn) or specific scorch diseases caused by fungi or bacteria can produce similar symptoms. Winter leaf scorch in evergreen plants usually appears as two long, brown areas paralleling the main leaf vein.Īlthough plants can experience scorch with no insects or disease pathogens involved, insect and disease damage can also affect the plant’s uptake of water. Symptoms may not become apparent for a month or more after the initial injury. Scorch may result from hot, dry weather in summer or from strong, dry winter winds when the ground is frozen. This should not be confused with the browning and shedding of older interior needles. If unfavorable conditions become more severe, browning of needles increases. Leaf scorch on narrow leaf evergreens appears as brown or purple brown discoloration of the needle tips. Symptoms usually appear after drying winds in conjunction with periods of hot, dry weather. Premature dropping of leaves and twig dieback may occur during the late summer. Look for damage to trees and shrubs on the upper portion on the sunny, southern side and on the windy side. Due to environmental causes, leaves may dry, turn brown, and become brittle. Where leaf scorch occurs each year, such annual stress will gradually weaken the plant, making it more susceptible to insects and diseases.īrowning of leaf margins and/or yellowing or darkening of the areas between the main leaf veins are symptoms of leaf scorch. In more severe cases, plants may drop many of their leaves prematurely, although such plants do not die. In mild cases of leaf scorch, the leaves remain attached, and little damage results. Do not spray on windy days to eliminate drift problems and do not allow mist to settle onto trees. Herbicides and pesticides may also contribute to scorch. Anything that affects the plant’s ability to take up water, including insect and disease problems, can result in leaf scorch. ![]() Unfavorable locations, such as sandy or gravelly soil, near obstructions or pavement that restrict root growth, or exposed windy slopes usually promote scorch. ![]() Scorch most often occurs following prolonged periods of dry, windy weather or bright sunshine when the roots are unable to supply water to the foliage as rapidly as it is lost by transpiration from the leaves. It is a widespread noninfectious disease or disorder. Leaf scorch may occur on any species of tree or shrub as well as herbaceous plants. Leaf scorch on Japanese maple leaves ( Acer palmatum)
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