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Dying Cedar Hedges —What Is the Cause?

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Points covered in this factsheet Symptoms Planting problems Physiological effects Environmental, Soil and Climate factors Insect, Disease and Vertebrate agents Dying Cedar Hedges —What Is The Cause? Attractive and normally trouble free, cedar trees can be great additions to the landscape. Dieback of cedar hedging in the landscape is a common prob- lem. In most cases, it is not possible to pinpoint one single cause. Death is usually the result of a combination of envi- ronmental stresses, soil factors and problems originating at planting. Disease, insect or animal injury is a less frequent cause. Identifying The Host Certain species of cedar are susceptible to certain problems, so identifying the host plant can help to identify the cause and whether a symptom is an issue of concern or is normal for that plant. The most common columnar hedging cedars are Thuja plicata (Western Red Cedar - native to the West Coast) and Thuja occidentalis (American Arborvitae or Eastern White ICULTURE, PLANT HEALTH UNIT Cedar). Both species are often called arborvitae. Common varieties of Western Red ce- dar are ‘Emerald Giant’, ‘Excelsa’ and Atrovirens’. ‘Smaragd’ and ‘Pyramidalis’ are com- mon varieties of Eastern White cedar hedging. Species of Cupressus (Cypress), Chamaecyparis nootkatensis (Yellow Cedar or False Cypress) and Chamaecyparis law- soniana (Port Orford Cedar or lawsom Cypress) are also used in hedging. Symptoms The pattern of symptom development/distribution can provide a clue to whether the prob- lem is biotic (infectious) or abiotic (non-infectious). Trees often die out in a group, in one section of the hedge, or at random throughout the hedge. Random distribution is generally an indication of an infectious disorder. If the trees are stunted compared to healthy trees, this is an indication that they have been under stress and declining for several years. It could be abiotic or a combination of abiotic and biotic factors contributing to decline. If damage occurred suddenly with no previous symptoms, it is most likely some change (cultural) or extreme condition (most likely environmental) that occurred recently in the current growing season. If entire trees are dead, this suggests damage to the roots and/or Dying Cedar Hedges base of the tree. Death or discolouration of individual branches can be due to a disease, B.C. MINISTRY OF AGR insect damage or physiological response to abiotic factors. Page 2 DYING CEDAR HEDGES Planting Problems Roots fail to grow out of the root ball sufficiently Girdling: If the root ball has after planting. Trees that survive the first year become pot-bound in a nursery after transplanting may remain stunted and container and is not cut and decline gradually for several years, until another spread open at planting, the stress results in tree death. Common causes of taproot may grow around the root growth failure are : base of the stem and gradually kill the tree. Desiccation: In hot summer weather, root balls Girdling- can easily dry out during transport or at the site roots Soil type, compaction and before the trees are transplanted. This prevents deep planting: If the soil at the new root growth. When dead trees are dug up, a planting site is quite different dry airspace can often be found between the root Twine and Burlap: Some from the soil in the root ball, new ball and the side of the planting hole. Plant new twine may not disintegrate roots may have difficulty growing hedges in cool weather. Watering thoroughly is quickly enough in the soil. If into it. This is particularly true key for helping cedars take root after planting. It the twine is not removed at where the landscape soil has a is important to keep cedars watered during dry planting, it may cut into the high clay content or is weather. A deep thorough watering once or twice stem as it grows, causing compacted from construction. In a week is better than light, frequent watering. decline and death of the tree. addition, by planting too deep, Balled and burlapped plants are more Some burlap sacking is roots die out from lack of oxygen. susceptible to desiccation than plants grown in treated with copper sulfate containers since up to 90% of their root system is (appears blue or green in Excess Fertilizer: Adding too lost at digging. Minimizing drying of the root ball colour) to prevent rot. If much fertilizer can damage roots can prevent tree establishment problems. treated burlap is not removed, and cause browning of foliar tips. the copper sulfate can prevent Lack of fertilizer will also cause new root growth. tree decline. Physiological Effects Discoloured Foliage: Foliage Cedar Flagging/Browning may take on a bronze to reddish (Environmental): Foliage takes on an brown to black colour in cold win- overall brownish or purplish colour in ters. This is natural and the trees early spring. This colour may change will green up as the growing sea- rapidly. Healthy plants will green-up as son progresses. the season progresses. It is very com- A few varieties have a natural mon on Western Red Cedar and less bronze or blue tinge in certain frequent on Eastern White Cedar. Flag- seasons. Some cedars appear ging may be more severe in hot, dry blue when flowering. weather but is not harmful to the tree. Dying tree—Root rot, Flagging or Nutritional? Environmental, Soil and Chemical Factors Heat: Foliage can become dull or bronzed in pH: Thuja spp. prefer a soil pH mid-summer from heat and desiccating winds. Prolonged flooding and of 6.0 to 6.5, but will grow well overwatering can also cause in soils up to 7.5. Soils that are root death from lack of oxy- too acidic can results in nutrient Water Stress: Cedars are relatively shallow- gen in the root zone. Water deficiency symptoms (browning rooted trees. They are susceptible to drought can accumulate under hedg- or yellowing of foliage) and stress especially on well-drained, sandy soils. es that are planted downhill eventual tree decline. The extreme of very wet soil in the fall and from watered lawns. Excess winter, followed by a hot, dry summer, is very moisture can encourage root stressful for the roots. Hedges should be wa- rots caused by water molds. Mechanical: Caused by injury tered regularly during very dry periods. Mulch- to the base of the trees from ing will help to maintain even soil moisture. mowers and trimmers. UPDATED MARCH 2015 Page 3 Herbicide: Runoff or drift from herbicides may injure cedar hedges. It may take some time for an entire tree to gradually die after exposure to a systemic herbicide, such as ROUNDUP (glyphosate). Road Salt: Road salt can damage foliage if slush splashes up onto trees. It can also kill roots by accumulating under hedges in snow melt water or runoff. The damage is uniform along the hedge seen in the lower section. Insect, Disease and Vertebrates Insects and Mites evident below the flagged Scales are round to oval, Cypress Tip Moth (Leaf miner): Adults (6mm, portion of the branch. white and 1.5 mm long. silvery tan moths) are active in early June. Damage can occur from Direct management against Eggs are inserted into the green tips of one March to July. Larvae may the newly-hatched crawlers and two year-old twigs. Infested twigs turn feed on roots and crown in mid-June. yellow, then brown in late winter. White, spun causing serious damage on cocoons can be found on leaf scales in early landscape plantings. June. Western Red Cedar is not affected. Juniper Scale: Juniper Mites: Overall yellowing or browning of foliage scales attack juniper, with speckling may be due to mite infestation. arborvitae, cedar and A few mites are usually not a problem, but in cypress. Cones, twigs and hot, dry weather they can build up to damag- needles are attacked. Heavy ing levels. Monitor by gently shaking the infestations deplete plant foliage above a sheet of white paper. Miticides sap resulting in grey or are available for management. yellow foliage, reduced growth over time and Root Weevils: Adults may girdle twigs a few possible death of young Root Weevil feeding damage in the cm from tips and turn the foliage brown, similar branches. crown area to flagging. Notching of the stem will be Vertebrates Mice and Rodents: Chewing injury can often Dog Urine: Small yellow, be found on twigs just below dead leaves. brown to black patches of Damage is often worse at the base of the dead foliage at the base of tree, but can occur quite high up. Bark can the trees. Dogs generally also be chewed or stripped off at the base of make an arch urinating on the tree. This may cause death of the branch- the foliage. Foliage affected es on one side, or, if the trunk is girdled, may by this eventually turns kill the tree entirely. Dogs have also been black and dies. known to chew lower branches and strip bark from trunks. Woodpecker damage—Photo by Becca MacDonald, Sault College, Bugwood.org Diseases Root Rot: Armillaria root rot is sometimes found in cedar hedges. Branches turn brown, Phytophthora is a weak often starting on one side of the tree. Fans of pathogen on Thuja, invading white fungal mycelium can be found under roots that have been dam- the bark at the base of dead trees and in the aged by water stress or roots. Black ‘strings’ called rhizomorphs other factors. Western Red spread the fungus from one tree to another. Cedar is resistant to Phy- There is no cure for Armillaria. Rogue out Armillaria root rot –white tophthora root rot but the and burn diseased plants taking care to mycelial mats Eastern White Cedar, espe- remove all traces of tree roots and fungal cially ‘Smaragd’, may be Phytophthora root rot: ‘rhizomorphs’ before replanting with resistant somewhat more susceptible.
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