8/30/2023 0 Comments Picture of sugar maple leafGrowth produces new leaves that offsets the loss of the damaged leaves. Frequent watering during periods of drought help to maintain growth and tree vigor. Good cultural practices that improve general tree health and promote good root growth will reduce the risk and severity of leaf scorch. While you cannot control the weather and there is no “cure” once the damage has been done, there are steps that can minimize the effects of leaf scorch. (Click photos to enlarge.)Ĭlose up of scorched leaves showing the tree is continuing to grow – new leaves are present on the branches. Trees were exposed to 32 days without any measurable rainfall, 2 hot spells, each with several days with temperatures above 32 degrees Celsius and warm, drying winds. Leaf Scorch can reduce the health of the tree making it more susceptible to disease and insect attack.Įxample Photos – All trees were watered every 5 – 7 days with 45 litres or more per tree per watering since planting. Premature dropping of leaves and twig dieback may occur during late summer. Leaves on the same branch often show similar symptoms but an entire tree may not be uniformly affected. Scorched leaves are more evident on the sides of the trees most exposed to prevailing winds and strong sunlight. Entire leaves may curl and wither when leaf scorch is severe. Browning of dead tissue often appears without any previous yellowing, extending into the leaf area between the veins. Since these parts are the last to be supplied with water from the roots, they are usually the first to be affected. Leaf scorch typically appears in July and August as a yellowing between leaf veins and along margins and a browning of the leaf tips. They are still getting established in their new environment. Trees planted within the past two years are particularly susceptible to leaf scorch as their roots have not regenerated sufficiently to supply the moisture demands of the foliage. Trees begin to wilt and suffer drought stress when the transpiration rate exceeds water take-up. Plants draw in water from the soil, use it for plant growth, and then release it in the form of a vapour, from stems and leaves through a process called transpiration. Leaf Scorch, a noninfectious, environmental condition, occurs when young trees experience prolonged periods of dry, windy weather, low rainfall and high temperatures with bright sunshine when the trees roots are unable to supply water to the foliage as rapidly as it is lost by transpiration from the leaves.
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