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Dummer. ゛☀
2017年08月30日
Dummer. ゛☀
The giant dogwood has such an appealing appearance that it’s also known as wedding cake tree. This is due to its tiered branch structure and elegantly variegated white and green leaves. Wedding cake tree care for young plants should be consistent until establishment but mature variegated giant dogwood trees are quite hardy and tolerant provided they are kept moist. Read on to learn more about this interesting flowering dogwood variety.
Giant Dogwood Information The wedding cake dogwood has the grown up moniker Cornus controversa ‘Variegata.’ This lovely tree grows up to 50 feet tall but more commonly 25 to 30 in height. It is a native of Asia, which can be planted in United States Department of Agriculture zones 5 through 8. These trees are easy to grow and susceptible to only a few pests and diseases.
The wedding cake dogwood is a fast growing tree that does well in either partial shade or full sun. The limbs are horizontal, giving the appearance of layering, but as the plant matures they tend to droop a bit. In spring, it produces a brilliant display of creamy white flowers. An interesting nugget of giant dogwood information reveals these flowers to be leaves. The flowers are actually bracts, or modified leaves, that form around the very tiny and mundane real flower. The flowers develop into bluish-black berries that are favorites of birds, squirrels and other animals. In fall, the leaves turn a rich red and in spring the bright green tops of new leaves compliments the variegated silvery white tinged under leaves.
Growing a Giant Dogwood Tree These trees are not found in many nurseries, but if you are lucky enough to find one, take care to situate it in a good location and provide basic wedding cake tree care as it establishes. The best place for variegated giant dogwood trees is in slightly acidic soil where there is dappled lighting. It will also perform well in full sun situations. You can plant it in either clay or loam but the soil should be slightly moist but not boggy. Take care to provide enough space above and on the sides for the adult height and spread of this majestic tree.
Care of the Wedding Cake Dogwood After planting, it is a good idea to stake the young tree for straight strong growth. Provide water weekly for the first few months, and thereafter supplement moisture in very dry periods and in summer with a deep drench every couple of weeks. This tree is resistant to many pests but does occasionally has a problem with dogwood borers and scale. It is resistant to Verticillium but may become prey to canker diseases and root rot. Overall it is a very easy tree to care for and worth having for its many seasons of interest.
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Dummer. ゛☀
2017年08月30日
Dummer. ゛☀
Dogwood is a popular ornamental tree with its flowering bracts, elegant foliage, and bright red fruits. These plants are relatively hardy but they do have their Achilles’ heels. We have all heard the fables about how even the smallest can bring down the mighty. This is true with a host of fungal and bacterial diseases of dogwood or tiny insects that may infect or infest your dogwood tree. The issues affecting dogwood trees are too numerous for this writing, but we can cover some of the most common dogwood problems.
Dogwoods need fertile, moist soil with good drainage. They are understory trees and require dappled lighting with protection from the hottest rays of the day. But even plants with good site conditions, annual fertilizer and adequate water may still encounter dogwood tree problems that destroy their health and vigor.
Diseases of Dogwood Dogwood anthracnose is one of the most common fungal diseases to attack this plant. It starts out with blighted leaves, showing purple margins and tan color around the edges of leaves. Secondary signs may include cankers on twigs and smaller branches. These gradually extend to the trunk of the tree with necrotic weeping areas. Spot anthracnose, septoria leaf spot and powdery mildew are all conditions that affect the leaves. Root rots and canker disease abound and thrive in moist conditions. There are listed fungicides and bacterial agents to combat the various disease issues affecting dogwood trees. Check with your local County Extension office for help in treatment or contact a certified arborist.
Dogwood Tree Pests Hardly any ornamental tree is without its fans. Dogwood trees have several insects and their larvae that call the tree their home. Significant loss of vigor and illness can result when these tiny marauders invade in quantity. The dogwood borer is the most noteworthy pest of the tree. Larvae live in the cambium layer and their travel and eating damage the flow of nutrients and water. Often branches can die. Numerous scale insects are dogwood tree pests. The dogwood sawfly larvae feed on the foliage and the dogwood club gall midge causes spindle-shaped swelling on twigs. In large colonies, the only treatment is pesticide sprays to prevent loss of health in your tree. Read all the directions carefully and use a targeted formulation.
Other Common Dogwood Problems Dogwoods do not respond well to drought or flooding. They need fertile soil, so in poor soils they will eventually decline. The foliage may burn or turn reddish in summer when there is insufficient water. Use mulch 3 to 4 inches deep and 3 feet around the trunk to conserve moisture. Just be sure it doesn’t touch the trunk. Speaking of trunks, the tree is susceptible to mechanical injury, which will open the gate to insect invasions or fungal issues. Most dogwood tree problems can be avoided by giving adequate care and choosing healthy dogwood varieties that are suited for your area.
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Dummer. ゛☀
2017年08月30日
Dummer. ゛☀
Dogwoods are native ornamental trees. Most flower and fruit, and have dazzling fall displays as the leaves change color. Peeling bark on dogwoods may be the result of serious disease or it could be a natural condition in some species. Knowing the species of your tree is crucial to deciding if a dogwood with peeling bark is in danger or if it is a normal occurrence. Dogwood is both a native and introduced species across North America, especially the cooler climates. The plants may be trees or shrubs in form, but all of them offer extraordinary color and many of them flower.
Many of the varieties are deciduous and provide a rich fall color display followed by bright green, yellow, coral and orange revealed stems. They are quite winter hardy but are sensitive to mechanical injury and a variety of pests and diseases. For this reason, the tree bark flaking on dogwood trees may be the result of a canker, borer, string trimmer or fungal disease, to name but a few.
When a Dogwood with Peeling Bark is Normal The Kousa dogwood is an ornamental tree that is more cold tolerant than flowering dogwood. It has bark which peels off in irregular patches, revealing a mosaic of mottled colors underneath. The dogwood bark peeling off is part of this tree’s appeal, along with its winter interest and fall display of purple leaves. Other times that peeling bark on dogwoods may be normal is when it occurs due to wild herbivores rubbing their antlers or standing on the trunk. Small rodents may also chew on trunks and cause sloughing bark. None of these conditions are good for the tree but would be categorized as wildlife problems and completely normal in certain regions. Sunscald on young trees may also result in peeling bark. It is a good idea to site them where winter sun won’t be aggressive or paint the trunk with latex paint thinned with water. Drought conditions can cause cracked bark near the base. This condition is easily corrected by giving the plant supplemental moisture.
Dogwood Tree Bark is Peeling Due to Disease Dogwood anthracnose is a common disease in the Cornus genus. It causes yellow leaves and twig dieback, as well as sunken discolored areas of tissue. These are common symptoms of branch and crown canker as well. Basal trunk canker will cause splitting and some loss of bark. It also presents with lesions in the tree that weep sap and can seriously affect the health of the tree. It is best to consult an arborist for either of these diseases which cause peeling bark on dogwoods.
Pests that Cause Tree Bark Flaking on Dogwood Dogwood bark peeling off may be the result of tiny insects that do more harm than good. The dogwood twig borer is a nasty pest that gets into the vascular tissue of the tree and undermines the tissue. It lives in the tree’s tissue and causes bark upheaval in infested locations. These invasive creatures may be difficult to detect until widespread damage is done because they hide away from investigative eyes inside the plant. Other borers, like the apple tree borer, also appear to favor Cornus trees and cause similar damage.
Scale insects in high concentration may make it appear that the dogwood bark is peeling. This is because when they mass on a stem, they seem like hard-bodied scabs which can be easily flicked off with a fingernail. They have the appearance of damaged bark but are actually insects subject to pesticides and manual removal.
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Dummer. ゛☀
2017年08月30日
Dummer. ゛☀
The dogwood is a favorite ornamental tree with numerous seasons of interest. As a landscape tree, it offers flowering spring beauty, a fall color show and bright berries in winter. In order to get all these attributes at their peak, it is a good idea to apply fertilizer for dogwoods. But do you know when to feed dogwood trees, or how to fertilize dogwoods? Timing and know how are the key to success in everything. Read on for information to keep your dogwood looking its best.
When to Fertilize Dogwood Trees Dogwoods are native to Eurasia and North America in temperate to warm regions. The plants are part of a classic landscaping scheme of natural deciduous trees and shade to partial shade understory plants. The delicate flower-like bracts liven up the garden and lead up to a festive display of colorful berries. Fertilizing dogwood trees in spring will produce good tree health and vitality to ensure the best displays. The key to useful plant feeding is to time it correctly. Fertilizing dogwood trees too late in the season might inadvertently cause a flush of new growth, which would be too sensitive to survive an early cold snap. The better idea is to feed the tree in early spring and again three months later. This will give the plant all the extra nutrients it needs during the growing season.
Dogwood Tree Food The type of dogwood tree food is an important consideration too. New trees need a different ratio than established specimens. Dogwood trees need slightly acidic soil to thrive. Before you apply any fertilizer for dogwoods, it is a good idea to test your soil and see what nutrients it lacks and if the pH is suited to your plant. If the soil is not acidic, you can use an acid lover’s fertilizer suitable for such plants as rhododendron and holly. In most regions, a ratio of 12-4-8 or 16-4-8 will be sufficient. Such a ratio is higher in nitrogen, which is what the plant needs to form leaves and vegetative growth. That being said, too much nitrogen can limit the flowering in dogwoods.
How to Fertilize Dogwoods Young trees should not be fertilized the first year, as they are too sensitive at planting and damage could occur at the root level. If you feel you must fertilize, use an organic tea, diluted to half. Once the tree is at least 6 feet tall, use ¼ cup of fertilizer in February to March, and feed again three months later. The granular form is useful and should be dug in around the edges of the root zone. Make sure you water well after fertilizing.
Mature trees benefit from ½ cup per inch of trunk. You can also gauge the amount by figuring 3 ounces of fertilizer per every 1,000 square feet. Scatter the grains within 100 square feet of the tree and scratch into the soil. The adult tree’s root zone will go out that far from the tree and the wide area will have a better chance of delivering the food to the root system.
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Dummer. ゛☀
2017年08月30日
Dummer. ゛☀
The gray dogwood isn’t a tidy or attractive plant that you would want to plant in a well-groomed garden, but if you are planting a wildlife area or want a shrub for difficult conditions, it may be just what you need. Read on for information about this humble shrub.
Gray Dogwood Information Gray dogwood (Cornus racemosa) is rangy and even a little scraggly, with suckers springing up all around it. The fall leaves are dark reddish purple, and while the color is interesting, you wouldn’t call it attractive. The white winter berries only last a short time and don’t add much to the appearance of the shrub. Although you may not want to plant it in a formal garden, it is right at home in a wildlife area or a location with poor, wet soil. As wildlife plants, gray dogwood thickets provide shelter, hiding places and nesting sites for birds and small mammals. Several species of birds eat the berries, including Eastern bluebirds, Northern cardinals, Northern flickers and downy woodpeckers. The flowers attract butterflies, and some species use them as larval host plants.
Growing Gray Dogwoods Although you can grow it as a tree, a gray dogwood tree soon becomes a multi-stemmed shrub without constant attention in removing the suckers. Growing gray dogwood shrubs in a row provides a screen against unsightly views, strong winds, and harsh sunlight. Gray dogwood care is a snap too. The shrubs thrive in full sun or partial shade and almost any soil. They aren’t bothered by air pollution. These shrubs tolerate dry soil, so they seldom need watering, and never need fertilizer. The biggest task in caring for gray dogwood is keeping the suckers at bay. Pull them up whenever possible. If you have to cut them, cut at the source below the surface of the soil. Partially removed suckers soon return.
Is Gray Dogwood Invasive? Any plant growing in its native range has natural controls to keep it in check, so native plants aren’t invasive. Gray dogwood is a native plant that is not considered invasive in any part of the U.S. In fact, it is recommended as an alternative to invasive shrubs such as non-native honeysuckle.
Gray dogwood can, however, become aggressive in the landscape. It produces multiple suckers that become new stems. Over time, the shrub forms a thicket unless it’s thinned from time to time.
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Dummer. ゛☀
2017年08月30日
Dummer. ゛☀
There are any number of diseases and pests that can stress your dogwood and cause dogwood leaf drop. It is normal to see leaves falling in autumn but you should not see a dogwood tree dropping leaves in summer. When leaves are falling off dogwood in summer, it could mean a serious illness, improper siting or cultivation problems. Let’s examine proper cultivation and conditions for the trees and see what can be done about treating a diseased dogwood.
Why Leaves are Falling Off Dogwood? Dogwoods are elegant, beautiful ornamental trees with several seasonal displays. Their oval to heart-shaped leaves deepen to crimson and orange in fall. The green leaves add charm and movement during the growing season and set a perfect backdrop for the bright flowerlike bracts. Dogwood leaf drop is not only an unsightly problem but it can spell doom for a plant due to reduced vigor. It is essential to determine the cause and preserve the energy gathering foliage. Dogwood plants need acidic well-drained soil in full to partial shade. Failure to provide these conditions will encourage disease and pest problems.
Pests That Cause Leaf Drop Some of the most common pest causes of a dogwood tree dropping leaves are: Borer insects Scale Dogwood sawfly Insect pests are usually the easiest to diagnose. Borers leave piles of sawdust near the holes they make, scale is visible as little armored bumps along stems and sawfly larvae cause skeletonized leaves with whitish powder coating them. Borers and scale respond to appropriate insecticides while sawfly larvae are large and obvious enough to hand pick and destroy. Treating a diseased dogwood is a bit harder and requires correct diagnosis of the disease.
Treating Dogwood Leaf Diseases Diseases of dogwood are the usual suspects when leaves are falling prematurely and include: Powdery mildew Leaf spot disease Canker Anthracnose One of the most recurring causes of leaf drop is powdery mildew. Many varieties of plants can get this fungal infection, which cause leaves to get a white coating and eventually suffocate and die. If a tree has a lot of powdery mildew, the overall health of the tree is affected due to minimized harvest of solar energy. Fungicides can be effective or you can prune out the infested areas. If the disease is a common problem in your area, it is best to choose a cultivar with powdery mildew resistance.
Leaf spot disease also occurs on twigs and buds. It causes brownish tan spots on foliage, especially on shaded trees after heavy rains in the warm seasons. Prune out affected stems and leaves and destroy the plant material. Crown canker is a serious disease that will eventually girdle the tree, causing not only leaf drop but complete die back. The tree will need to be removed and destroyed.
Anthracnose affects many ornamentals. It is characterized by purple spots on bracts and leaves in spring. Usually no treatment is necessary, but in severe cases, use fungicide at bud break. Follow with the spray every 7 to 14 days until all the leaves have opened.
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Dummer. ゛☀
2017年08月30日
Dummer. ゛☀
Autumn foliage aside, yellow leaves on a tree generally doesn’t signal health and vitality. The flowering dogwood tree (Cornus florida) is no exception. If you see your dogwood tree leaves turning yellow during the growing season, the tree is likely suffering from a pest, disease or deficiency. Read on to find out why your dogwood has yellow leaves.
Avoiding Sick Dogwood Trees When delicate blossoms open on your dogwood tree boughs, you know that spring is on the way. This native tree grows wild throughout the eastern states, and it is also a popular ornamental. The small size works well in home gardens and backyards, but improper culture can cause sick dogwood trees. The best defense against pests or diseases attacking your dogwood is to provide appropriate care for your tree. This is easier when you understand that dogwoods are understory trees in the wild, growing in shade on organically rich soil. You need to provide a similar environment.
Dogwood Tree with Yellow Leaves – Borer Attacks If your tree canopy dies back or the leaves turn fall colors prematurely, it may indicate a dogwood borer attack. This insect is the most common pest of the cultivated dogwood. Adult borers are day-flying moths that lay their eggs wounds or fissures in the tree bark. As the insect larva emerge, they bore into the tree, leaving holes and sawdust-like frass as evidence of their presence. Yellow leaves on dogwood trees can be an early sign of an infection. To prevent a borer attack, plant your dogwood in shade, not direct sun, and provide adequate irrigation to avoid water stress. Don’t weed whack close to the base of the tree or otherwise wound its bark, since wounds provide an entryway for the borers.
Yellow Leaves on Dogwood Trees – Chlorosis Another possible cause of yellow leaves on dogwood trees is chlorosis. Dogwood trees are susceptible to iron chlorosis, which means that the trees are not uptaking sufficient iron to manufacture chlorophyll, the green pigment in leaves. You should suspect chlorosis if the yellow first shows up in the area between the leaf veins, leaving the veins green. In more severe cases, the entire leaves turn pale yellow.
To prevent chlorosis in your dogwood tree, check the soil acidity before planting. Dogwoods cannot absorb the iron in the soil if it is too alkaline, that is, if the pH is above 7.5. While you are doing soil testing, check for magnesium, manganese and boron levels as well, since deficiencies in these minerals can also cause chlorosis. When you see your dogwood tree leaves turning yellow because of chlorosis, make sure you are watering appropriately. Overwatering the tree (or poor drainage) can also cause chlorosis. Likewise, root damage, girdling roots and trunk wounds all make it more difficult for the tree to transport nutrients.
Dogwood Has Yellow Leaves – Other Issues If your dogwood has yellow leaves, the tree might also suffer from some other disease. For example, leaves with powdery mildew can turn yellow. Identify the disease by the white powder on foliage. Similarly, scale infection can also cause yellow leaves on dogwood trees. Scales are legless insects that look like small brown bumps on foliage or stems. Kill adults and eggs by spraying horticultural oil in spring.
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Dummer. ゛☀
2017年08月30日
Dummer. ゛☀
Dogwood trees are beautiful, iconic landscaping trees that come from the forest understory. Although they’re great for adding lots of curb appeal, they’ve got a few serious problems that can spoil the idyllic feel of your yard. It’s never good news when a tree gets sick, especially when it’s your stately dogwood tree. Dogwood tree blight, for example, is a fungal infection of dogwood trees that can turn these valuable visual assets into serious detriments. Read on to find out about dogwood tree blight and what you can do to help your plant through this rough time.
Dogwood Anthracnose Information Dogwood blight, also known as dogwood anthracnose for the fungal pathogen that causes the disease, is a fairly new problem. It is believed to have started in the northeastern United States about 25 years ago, but has been spreading southward ever since. The early symptoms are similar to leaf spot diseases, with purple-bordered soft, wet spots appearing on leaves, especially around the margins. Once the disease spreads to leaf petioles and twigs, however, it becomes more obvious. Leaves attached to these infected areas will shrivel and turn black. In very advanced disease, lower branches may die, cankers may form on the limbs and trunk sprouts will increase in number.
Controlling Dogwood Blight Dogwood blight control is difficult, but if you catch it early, you may be able to save the tree by cutting out all diseased tissues. That means all leaves, all twigs and all branches showing signs of infection must be removed and destroyed promptly. Small trees may be saved with a fungicide spray applied every 10 to 14 days as long as cool, moist weather persists. Prevention of dogwood blight is the best tool you’ve got to keep your landscaping trees healthy. Keeping your dogwood properly watered and fertilized is the first line of defense, two to four inches of mulch spread over the root zone will help maintain soil moisture. Removing spent leaves, pruning low branches, opening up a dense canopy and trimming water sprouts in the fall will create intolerable conditions for the fungus.
If you’ve lost a tree to dogwood blight, consider replacing it with Oriental dogwood (Cornus kousa). It has a high tolerance to anthracnose. White dogwoods seem to be less susceptible to the infection than their pink counterparts; there are also new cultivars of the Appalachian dogwood series that are bred to be anthracnose resistant. Whatever you do, don’t transplant a wild dogwood into the landscape – this is how many infections started.
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Dummer. ゛☀
2017年08月30日
Dummer. ゛☀
Also known a swamp dogwood, silky dogwood is a mid-size shrub that grows wild along streams, ponds and other wetlands across much of the eastern half of the United States. In the home landscape, silky dogwood bushes work well in moist, naturalized areas and do a good job at stabilizing the soil in erosion-prone sites. Mature height generally ranges from 6 to 12 feet. Read on for additional silky dogwood information.
Silky Dog Information Silky dogwood (Cornus amomum) is named for the silky gray hairs that cover the undersides of leaves and twigs, which turn purplish in spring and reddish-brown in autumn. It is from these silky hairs that make silky dogwood identification fairly easy. Clusters of tiny creamy white flowers bloom in late spring and early summer. The plant is often found in shade or semi-shade but tolerates moderate sunlight. Silky dogwood bushes may not be the best choice if your goal is a tidy, manicured garden, but the shrub’s rather unkempt, rounded appearance fits well into a natural setting. Birds love the pale blue fruit that shows up in late summer.
Growing Silky Dogwood Shrubs A relative of dogwood trees, silky dogwood bushes are suitable for growing in USDA plant hardiness zones 5 through 8. The shrubs are adaptable plants that tolerate either dry or wet sites, but prefer moist, well-drained soil. Although silky dogwood withstands alkaline soil, the plant is better suited to slightly acidic conditions.
Caring for Silky Dogwoods Water young shrubs regularly until the roots are well established. Once the shrubs are settled in, caring for silky dogwoods requires little effort. For example, you can water the shrub – or not. A 2- to 3-inch layer of mulch will keep the soil moist and cool. No fertilizer is required.
Remove suckers if you want to limit growth, or allow the shrubs to grow unrestrained if you want to form a naturalized screen or thicket. Prune silky dogwood as needed into any size or shape you like, and be sure to remove dead or damaged growth.
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Dummer. ゛☀
2017年08月30日
Dummer. ゛☀
At maturity, it looks a bit like an elongated, bright red cherry and, in fact, its name references cherries, but it isn’t related to them at all. No, this isn’t a riddle. I’m talking about growing cornelian cherries. You may not be familiar with cornelian cherry cultivation and wonder what the heck is a cornelian cherry plant? Keep reading to find out how to grow cornelian cherry trees, uses for cornelian cherries and other interesting facts about the plant.
What is a Cornelian Cherry Plant? Cornelian cherries (Cornus mas) are actually members of the dogwood family and native to areas of Eastern Europe and Western Asia (they even survive in Siberia!). They are shrub-like trees that can grow up to 15-25 feet in height if left unpruned. The plant can live and be fruitful for up to 100 years. They bloom early in the season, even prior to forsythia, and bloom for an extended period of time, carpeting the tree in a yellow haze of tiny blossoms. The bark of the tree is flaky, gray-brown to brown. Bright green glossy leaves turn purplish-red in the fall.
Are Cornelian Cherries Edible? Yes, cornelian cherries are very edible. Although the plant is known primarily as an ornamental in the United States, ancient Greeks have been growing cornelian cherries for 7,000 years! The ensuing fruit is initially very tart and looks much like olives. In fact, the ancient Greeks pickled the fruit much like olives. There are actually a myriad of other uses for cornelian cherries such as for syrups, jellies, jams, pies and other baked goods. Russians even make it into a cornelian cherry wine or add it to vodka.
How to Grow Cornelian Cherry Trees While historically significant, cornelian cherries have not been mass produced due to the elongated pit inside the fruit that is difficult to remove, as it is firmly entrenched in the pulp. More often, the trees are seen as ornamental specimens, popular and planted around the 1920’s. Cornelian cherry cultivation is suited to USDA zones 4-8. The trees do best in full sun to part shade and while they do well in a variety of soils, they prefer fertile, well-draining soil with a pH of 5.5-7.5. This adaptable plant is winter hardy to -25 to -30 degrees F. (-31 to -34 C.). The tree can be pruned and trained into a single stemmed tree if desired and is primarily insect and disease resistant with the exception of dogwood anthracnose.
Cultivars include: ‘Aero elegantissima,’ with its variegated creamy-white leaves ‘Flava,’ with sweet, large, yellow fruit ‘Golden Glory,’ which bears large flowers and large fruit on its upright branching habit
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