动态第852页 - 绿手指 - 养花技巧、花生病了怎么办、花园打理和设计

2017年08月30日

With showy, white flowers that bloom in summer and attractive, glossy evergreen foliage, beauty leaf trees are tropical gems that deserve their name. They grow slowly to a height of up to 50 feet with a lush canopy that spreads 30 to 50 feet. Their intense fragrance and dense shade make them highly desirable specimen trees, but as you’ll see, they aren’t suitable for most North American landscapes.[图片]What is a Beauty Leaf Tree? Beauty leaf tree (Calophyllum inophyllum) is a broadleaf evergreen native to Australia, Eastern Africa and Southern India to Malaysia. According to most Calophyllum tree info, lumber from a beauty leaf is very hard and of high quality. In shipbuilding it is used to make masts and planks, and it is also used to build fine furniture. All parts of the Calophyllum beauty leaf are considered poisonous. The fruit is so toxic that it can be ground and used as rat bait. The sap is fatal when introduced into the blood stream, and was once used as arrow poison.[图片]Beauty leaf trees make a fine windbreak or hedge trees. They excel as street trees in areas that aren’t frequented by pedestrians. Calophyllums can also be used for espalier trees. Calophyllum beauty leaf is a great tree for frost-free coastal areas. Sandy soil, strong winds and salt spray aren’t a problem. High winds give the trunk a lovely, gnarled and twisted character. The branches are strong and don’t break when blown about.[图片]Can You Grow Calophyllum Trees? Beauty leaf trees are only for gardeners in frost-free areas. Rated for USDA plant hardiness zones 10b and 11, they die when exposed to freezing temperatures. If you live in a climate where you can grow a beauty leaf tree, you should consider the impact the fruit has on the landscape before planting the tree. Hard, golf ball-sized fruit drop from the tree when ripe. The fruit serves no useful purpose since it is poisonous and is not attractive to wildlife. Leaves and fruit create a significant litter problem and falling fruit is a hazard to anyone who wants to enjoy the shade of the tree’s dense canopy.

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2017年08月30日

A banyan tree makes a great statement, provided that you have enough space in your yard and the appropriate climate. Otherwise, this interesting tree should be grown indoors. Read on to learn more.[图片]Banyan Tree Info The Banyan (Ficus benghalensis) is a fig tree that begins life as an epiphyte, germinating in the crevices of a host tree or other structure. As it grows, the banyan tree produces aerial roots that hang down and take root wherever they touch the ground. These thick roots actually make the tree appear to have several trunks.[图片]Growing a Banyan Tree Outdoors On average, these trees have high moisture needs; however, established trees are drought tolerant. They enjoy sun to partial shade as well. Banyan trees are easily damaged by frost and are, therefore, best grown in warmer climates such as those found in USDA plant hardiness zones 10-12. Growing a banyan tree requires a lot of space, as mature trees become quite large. This tree should not be planted near foundations, driveways, streets or even your home, as its canopy alone can spread quite far. In fact, a banyan tree can get up to about 100 feet tall and spread over several acres. The leaves of banyan trees can reach anywhere from 5-10 inches in size. One of the largest banyan trees on record is in Calcutta, India. Its canopy covers 420 meters and stands over 80 feet tall, with more than 2,000 roots.[图片]Banyan Tree Houseplant Banyan trees are commonly grown as houseplants and are well adapted to indoor environments. Although the banyan tree is better somewhat pot bound, it’s a good idea to repot this plant at least every two to three years. The shoot tips can be pinched back to promote branching and help control size. As a houseplant, banyan trees prefer well-drained but moderately moist soil. The soil should be allowed to dry out between waterings, at which time it needs to be thoroughly saturated. However, caution should be taken to ensure that it doesn’t sit in water; otherwise, leaves may yellow and drop. Provide the banyan tree with moderately bright light and maintain indoor temperatures around 70 F. (21 C.) during summer and at least 55-65 F. (10-18 C.) throughout winter.[图片]Propagating Banyan Trees Banyan trees can be propagated from softwood cuttings or seeds. Cuttings can be taken from the tips and rooted or by eye cuttings, which require a piece of stem about a half inch below and above a leaf. Insert cuttings into a suitable rooting medium, and within a couple of weeks, roots (or shoots) should begin to develop. As parts of the banyan tree plant are poisonous (if ingested), caution should be used while handling it, as sensitive individuals may be susceptible to skin irritations or allergic reactions.[图片]If choosing to grow banyan from seed, allow seedheads to dry on the plant before collecting. Keep in mind, however, that a growing banyan tree from seed can take some time.

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2017年08月30日

The Emerald ash tree borer (EAB) is an invasive, non native insect discovered in the U.S. during the last decade. Ash borer damage is significant in all species of North American ash trees that become infected. Susceptible trees include white, green and black ash. Know where your ash trees are located and scout for the pest in June and July as the first step to prevent ash borer from causing serious or deadly damage.[图片]Emerald Ash Borer Characteristics The emerald ash borer is so named for its emerald green color. The insect is about ½ inch long and leaves D-shaped holes when exiting the ash trees interior. The pest lays eggs and leaves the larvae to hatch inside valuable ash trees, where they create serpentine tunnels that interfere with the tree’s ability to move water and nutrients throughout its tissues. Learning how to protect ash trees from ash borer can save your trees.[图片]How To Protect Ash Trees From Ash Borer Controlling the spread of emerald ash borer begins with keeping ash trees healthy and unstressed. The insect is usually spread through human activities, such as moving infested firewood. Prevent ash borer by inspecting firewood closely before purchasing and buy locally when possible. Do not transport firewood if you live in an area that has an ash borer population. Identifying ash trees is another step to lessen ash borer damage. Insecticidal treatments may slow damage to trees that are valued for shade or historic purposes. Ash tree borer treatment should be applied in May before adult insects emerge.[图片]Ash tree borer treatment is not needed until the emerald ash borer is spotted within a 15 mile radius, unless symptoms are visible on your ash trees. Symptoms include canopy dieback, D-shaped exit holes and bark splitting on your ash trees. If you see what appears to be ash tree borer damage, you may contact a certified arborist about how to protect ash trees from ash borer and what ash tree borer treatment works best in your situation. The tree professional may do systemic injections to kill larvae already inside the tree. Visible emerald ash borer characteristics and damage may be lessened with soil treatments and bark and foliage sprays.[图片]For the homeowner who spots ash borer damage and wishes to do their own ash tree borer treatment, a soil application of imidacloprid can be applied, (such as Bayer Advanced). Most chemicals to control ash borer damage require a pesticide applicator license for purchase.

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2017年08月30日

Ash trees make graceful landscape plants, but when your trees are stressed or plagued by pests, they may begin to shed bark in response to the damage they’re experiencing. As a good ash tree owner, it’s your job to determine if ash tree bark peeling is a sign of environmental problems or if the bark coming off ash trees is due to boring beetles. Read on for more information on these common ash tree problems and their management.[图片]Shedding Bark on Ash Trees When your ash tree is shedding bark, it may feel like time to panic, but try to keep your cool, often, this is simply indicating an easily correctable environmental problem. Ash trees typically grow on or near the banks of permanent water sources like streams and ponds. Because of this, they’re not very adaptable when the weather dries out and they can’t get the moisture they require. Often, they’ll shed bark in protest, but quick action on your part can slow or stop your ash tree losing bark. Provide the tree in question with ample water, up to 210 gallons a week during the summer for a tree with a 15-foot wide canopy, being sure to water at the drip line instead of near the trunk. An irrigation system can help keep your thirsty ash tree supplied with water.[图片]Other stressors like a sudden change in environment, such as trenching, removing the grass around the tree, herbicide use, over-fertilization or the failure of your irrigation system can also end in bark shedding. Water a stressed tree well, withholding fertilizer until the tree show signs of improvement.[图片]Ash Tree Losing Bark from Emerald Ash Borers and Sunburn Over-pruning is a common cause of an ash tree bark problem; the removal of branches that once shaded the trunk can lead to sunburn on these previously protected tissues. Sunburned bark may peel and fall off the tree in question and emerald ash borers can find their way to these easy to penetrate areas of tissue. Once sunburn has occurred, there’s no way to repair it but you can prevent it in the future by being careful to prune out less than a quarter of the living branches of an ash tree during any season. Check your damaged tree’s trunk for small holes before dressing the wounded areas with a trunk wrap or painting it with white latex paint mixed with equal parts water. If tiny d-shaped holes are peppered in the areas of peeling bark, you have a much more serious problem on your hands. This is the telltale sign of the emerald ash borer, a serious pest of ash trees. Trees that have been infested a while may have many dying branches and aggressive shoot growth around the base of the tree in addition to the bark peeling and holes in the trunk.[图片]Generally, borers are a death sentence for a tree – these insect pests spend most of their lives inside affected trees, causing a slow decline as they chew through the transport tissues that keep the tree hydrated and nourished. Once these are severed, it’s only a matter of time before the tree dies. A large tree can present a serious hazard to objects and people on the ground below – have your tree evaluated by an arborist if you suspect borers. Removal is typically your only option.

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2017年08月30日

Homeowners love the claret ash tree (Fraxinus angustifolia subsp. oxycarpa) for its fast growth and its rounded crown of dark, lacy leaves. Before you start growing claret ash trees, be sure your backyard is big enough since these trees can grow 80 feet tall with a 30 foot spread. Read on for more claret ash tree information.[图片]Claret Ash Tree Information Claret ash trees are compact, fast growing, and their deep green leaves have a finer, more delicate look than other ash trees. The trees also offer a terrific autumn display, since the leaves turn maroon or crimson in fall. Claret ash growing conditions influence the ultimate height of the tree, and cultivated trees rarely exceed 40 feet in height. Generally, the tree’s roots are shallow and do not turn into problems for foundations or sidewalks. However, it is always wise to plant ash trees a good distance from homes or other structures.[图片]Claret Ash Growing Conditions Growing claret ash trees is easiest in USDA plant hardiness zones 5 through 7. When it comes to providing good claret ash care, don’t worry too much about the type of soil in your backyard. Claret ash trees accept sandy, loamy or clay soil. On the other hand, sunlight is critical. Plant claret ash trees in full sun for fastest growth. If you read up on claret ash tree information, you’ll find that the tree will not tolerate frost, high winds or salt spray. However, this ash is quite drought tolerant once established. Take care not to weed-whack around your young tree. Ash bark is very thin when the tree is young and it can be easily wounded.[图片]Raywood Claret Ash When you are growing claret as trees, you should consider ‘Raywood,’ an excellent Australian cultivar (Fraxinus oxycarpa ‘Raywood’). This cultivar is so popular that the claret ash is also called the Raywood ash tree. ‘Raywood’ thrives in USDA hardiness zones 5 through 8. It grows to 50 feet high with a 30 foot spread. You should use the same cultural practices for ‘Raywood’ that you would use generally for claret ash care, but be a little more generous with irrigation.

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2017年08月30日

Ash trees are popular and attractive landscape trees. However, pruning ash trees is essential if you want healthy, vigorous specimens. Cutting back ash trees appropriately helps to establish a strong branch structure around a central leader. It can also reduce diseases and limit pest damage. Read on to learn how to prune ash trees.[图片]Reasons for Pruning Ash Trees Ash trees are handsome deciduous trees, native to North America. They offer attractive, rounded crowns in the growing season and beautiful autumn colors. The wood is hard, but agile, and most baseball bats are made of ash. Ash trees have an opposite branching structure. The opposing branch growth usually requires pruning to keep the tree balanced. In addition, the tree can be attacked by diseases and pests that can be controlled by pruning.[图片]Cutting Back Ash Trees Trimming your tree is not difficult, but it helps if you follow a few ash tree pruning tips. When to Prune Ash Trees When to prune ash trees depends in part on why you are making the particular pruning cut. Unless you are pruning to remove dead and diseased branches, you should take care to prune in late winter, while the tree is still dormant. For example, if you must remove live branches to allow additional sunlight and air to circulate inside the tree crown, wait until winter to act.[图片]Prune out broken, diseased, infected or dead ash tree branches whenever you spot them. The sooner you remove these branches, the less likely it is that decay-producing fungi spread to other areas of the tree. When you inspect the tree for problem branches, be sure to look at the underside of tree bark for an S-shaped pattern. This indicates the presence of the Emerald Ash wood-boring beetles, a pest that can quickly kill the tree. If you notice defoliation of some branches, it may be a sign of anthracnose. Any signs of brown areas on leaves or cankers on the branches should be your call to start pruning back ash trees in the very near future. These pests weaken the tree and can create serious problems if not addressed quickly by trimming back ash trees.[图片]How to Prune Ash Trees Use a three-step trimming method to remove branches from an ash tree. First, make a cut on the underside of the diseased or damaged branch. This cut should pass a quarter of the way through the branch about half a foot from the branch collar. Next, cut off the branch completely, making the cut one inch past the initial cut. This cut should be made from the top side of the branch. When you finish this cut, the branch will fall away. As a final step, remove the branch stump.

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2017年08月30日

Many native deciduous trees, like ash, can leak sap as a result of a common bacterial disease called slime flux or wetwood. Your ash tree may ooze sap from this infection, but you might also see, coming from the bark, foaming white material that does not look at all like sap. Read on for information about why an ash tree is dripping sap.[图片]Why is My Tree Leaking Sap? The bacterial infection called slime flux results when bacteria grows inside a wounded tree. Several types of bacteria are implicated, although botanists have not identified a main culprit. These bacteria generally attack an ill tree or one that is stressed from too little water. Usually, they enter through a wound in the bark. Inside the tree, fermentation occurs from the bacteria and carbon dioxide gas is released. The pressure of the gas release pushes the ash tree’s sap through the wound. Sap spills out, making the outside of the tree trunk look wet. An ash tree leaking sap is very likely infected by these bacteria. This is especially true if there is foam mixed with the sap.[图片]Why is My Ash Tree Oozing Foam? The wet areas of sap on the outside of your ash tree become breeding grounds for other organisms. If alcohol is produced, the sap foams, bubbles and produces an awful smell. It looks like an ash tree oozing foam. You may see many different types of insects and insect larva coming to dine on the spilled sap and foam. Don’t be alarmed, since the infection cannot be spread to other trees by means of insects.[图片]What to Do When an Ash Tree is Dripping Sap The best offense in this case is a good defense. Your ash tree is far more likely to get infected by slime flux if it suffers from drought stress. In addition, the bacteria usually seeks a wound to enter. You can help the tree to avoid this infection by watering it regularly when the weather is dry. One good soaking every two weeks is probably enough. And take care not to wound the tree trunk when you are weed-whacking nearby. If, despite these precautions, your tree continues to ooze sap, there is little you can do to help the tree. Remember that most trees with slime flux do not die of it. A small infected wound is very likely to heal on its own.[图片]Other Reasons My Ash Tree is Dripping Sap Ash trees are often are infested by aphids or scales, both small but common insects. It is possible that the liquid you identify as sap is actually honeydew, a waste produce produced by aphids and scales. Honeydew looks like sap when it falls like rain from a tree badly infected with these bugs, coating bark and leaves. On the other hand, don’t feel you need to take action. If you leave aphids and scale alone, no grand harm comes to the tree and predator insects usually step up to the plate. Other insects affecting this tree, and possibly causing it to leak sap, include the emerald ash borer.

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2017年08月30日

Ash yellows is a devastating disease of ash trees and related plants. It can infect lilacs as well. Find out how to recognize the disease and what you can do to prevent it in this article.[图片]What is Ash Yellows? Ash yellows is a newly discovered plant disease, first detected in the 1980’s. It probably existed long before that, but wasn’t detected because the symptoms are so similar to those of other plant diseases. In many cases, you won’t be able to get a firm diagnosis without laboratory tests. A tiny, mycoplasma-like organism that we call the ash yellows phytoplasma causes the infection. A disease that infects members of the ash (Fraxinus) family, ash yellows only exists in North America. The symptoms are similar to those of environmental stress and opportunistic fungi. Although we see it most often in white and green ash trees, several other species of ash can also become infected.[图片]Symptoms of Ash Yellows Ash yellows doesn’t discriminate about location. We find it in commercial woodlots, natural forests, home landscapes and urban plantings. Dieback may be rapid or very slow. Although it may be several years before the tree deteriorates to the point where it is unsightly or a danger to your landscaping and buildings, it’s best to remove it promptly to prevent the spread of disease. Replace it with trees that aren’t members of the ash family. It may be as long as three years after infection before the symptoms of ash yellows appear. An infected tree usually grows at about half the rate of a healthy tree. Leaves may be smaller, thinner, and pale in color. Infected trees often produce tufts of twigs or branches, called witches’ brooms.[图片]There is no effective ash yellows disease treatment. The disease is spread from plant to plant by insects. The best course of action if you have a tree with ash yellows is to remove the tree to prevent the spread to other trees. Does this mean that you have to give up ash trees and lilacs in the landscape? If you know there is a problem with ash yellows in the area, don’t plant ash trees. You can plant lilacs as long as you choose common lilacs. Common lilacs and hybrids of common lilacs are known to resist ash tree yellows.

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2017年08月30日

White ash trees (Fraxinus americana) are native to the eastern United States and Canada, ranging naturally from Nova Scotia to Minnesota, Texas, and Florida. They are big, beautiful, branching shade trees that turn glorious shades of red to deep purple in the fall. Keep reading to learn white ash tree facts and how to grow a white ash tree.[图片]White Ash Tree Facts Growing a white ash tree is a long process. If they don’t succumb to disease, the trees can live to be 200 years old. They grow at a moderate rate of about 1 to 2 feet per year. At maturity, they tend to reach between 50 and 80 feet in height and 40 to 50 feet in width. They also tend to have one leader trunk, with evenly spaced branches growing in a dense, pyramidal fashion. Because of their branching tendencies, they make very good shade trees. The compound leaves grow in 8- to 15-inch long clusters of smaller leaflets. In the fall, these leaves turn stunning shades of red to purple. In the spring, the trees produce purple flowers that give way to 1- to 2-inch long samaras, or single seeds, surrounded by papery wings.[图片]White Ash Tree Care Growing a white ash tree from seed is possible, though more success is had when they’re transplanted as seedlings. Seedlings grow best in full sun but will tolerate some shade. White ash prefers moist, rich, deep soil and will grow well in a wide range of pH levels.[图片]Unfortunately, white ash is susceptible to a serious problem called ash yellows, or ash dieback. It tends to occur between 39 and 45 degrees of latitude. Another serious problem of this tree is the emerald ash borer.

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2017年08月30日

Ovoid to nearly heart shaped, covered in knobby gray/blue/green hues that look almost like scales on the outside and inside, sections of glistening, creamy-white flesh with a shockingly pleasant aroma. What are we talking about? Sugar apples. What exactly is sugar apple fruit and can you grow sugar apples in the garden? Read on to find out about growing sugar apple trees, sugar apple uses and other information.[图片]What is Sugar Apple Fruit? Sugar apples (Annona squamosa) are the fruit of one of the most commonly grown Annona trees. Depending upon where you find them, they go by a plethora of names, amongst them include sweetsop, custard apple and the apropos scaly custard apple. The sugar apple tree varies in height from 10-20 feet with an open habit of irregular, zigzagging twigs. Foliage is alternate, dull green on top and pale green on the underside. Crushed leaves have an aromatic scent, as do the fragrant flowers which may be single or in clusters of 2-4. They are yellow-green with a pale yellow interior borne off of long drooping stalks. Fruit of sugar apple trees is as about 2 ½ to 4 inches long. Each fruit segment typically contains a ½-inch long black to dark brown seed, of which there may be up to 40 per sugar apple. Most sugar apples have green skins, but a dark red variety is attaining some popularity. Fruit ripens 3-4 months after flowering in the spring.[图片]Sugar Apple Information No one is exactly sure where sugar apples hail from, but they are commonly cultivated in tropical South America, southern Mexico, the West Indies, Bahamas and Bermuda. Cultivation is most extensive in India and is wildly popular in the interior of Brazil. It can be found growing wild in Jamaica, Puerto Rico, Barbados and in the drier regions of North Queensland, Australia. It’s likely that Spanish explorers brought seeds from the New World to the Philippines, while the Portuguese are thought to have brought the seeds to southern India prior to 1590. In Florida, a “seedless” variety, ‘Seedless Cuban,’ was introduced for cultivation in 1955. It does have vestigial seeds and has a less developed flavor than other cultivars, grown primarily as a novelty.[图片]Sugar Apple Uses The fruit of the sugar apple tree is eaten out of hand, separating the fleshy segments from the outer peel and spitting the seeds out. In some countries, the pulp is pressed to eliminate the seeds and then added to ice cream or combined with milk for a refreshing beverage. Sugar apples are never used cooked. The seeds of the sugar apple are poisonous, as are the leaves and bark. In fact, powdered seeds or dried fruit has been used as a fish poison and insecticide in India. A seed paste has also been used pasted on the scalp to rid people of lice. The oil derived from the seeds has also been used as a pesticide. Conversely, the oil from sugar apple’s leaves has a history of use in perfumes. In India, the crushed leaves are snorted to treat hysteria and fainting spells and topically applied to wounds. A leaf decoction is used throughout tropical America to treat a multitude of symptoms, as too is the fruit.[图片]Can You Grow Sugar Apple Trees? Sugar apples need a tropical to near tropical climate (73-94 degrees F. or 22-34 C.) and are unsuited to most areas of the United States with the exception of some areas of Florida, although they are cold tolerant to 27 degrees F. (-2 C.). They thrive in dry areas except during pollination where high atmospheric humidity seems to be an important factor. So can you grow a sugar apple tree? If you are within that climactic range, then yes. Also, sugar apple trees do well in containers in greenhouses. The trees do well in a variety of soils, provided they have good drainage. When growing sugar apple trees, propagation is generally from seeds that may take 30 days or longer to germinate. To hasten germination, scarify the seeds or soak them for 3 days prior to planting.[图片]If you live in a tropical zone and wish to plant your sugar apples in the soil, plant them in full sun and 15-20 feet away from other trees or buildings. Feed young trees every 4-6 weeks during the growing season with a complete fertilizer. Apply a 2- to 4-inch layer of mulch around the tree to within 6 inches of the trunk to retain moisture and regulate soil temperature.

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