绿手指
首页
动态
文章
百科
花园
设置
简体中文
已关注
+
关注
花园 (6)
动态 (3585)
Dummer. ゛☀
2017年09月13日
Dummer. ゛☀
This common fungal disease of tomatoes and potatoes first appears as dark brown spots on leaves. On close examination, the spots show a pattern of concentric brown rings. Spots may enlarge and merge, and the leaves will turn yellow and die. Infected plants slowly lose leaves from the bottom up as the disease progresses. Tomato plant stems may also be infected, and eventually tomato fruit will display leathery black lesions. If the disease progresses relatively slowly, gardeners can usually expect to harvest usable fruit, but the quality and yield will be reduced. When potatoes suffer from early blight, their leaves display similar black spots and the tubers become covered with brown, corky spots.
The early blight fungus overwinters in plant residues in the soil; the disease spreads rapidly in warm, humid conditions.
Prevention and Control Grow blight-tolerant tomato varieties and purchase disease-free seeds and plants. If space allows, rotate susceptible crops. Destroy any volunteer potato or tomato plants that sprout in your garden, as they may already be infected. Keep foliage as dry as possible. Use drip irrigation or soaker hoses rather than overhead watering. Keep tomato plants staked to encourage good air circulation and minimize contact between plants and soil. Mulch tomato plants early in the season to slow the disease spread. Pick off and destroy infected leaves. If the disease continues to spread, uproot and destroy or deeply bury the diseased plants. After harvest, remove all potentially infected plant debris from the garden and destroy it. Compost the material only if you maintain a “hot” compost pile that will reach 150 degrees F for several days.
0
0
文章
Dummer. ゛☀
2017年09月13日
Dummer. ゛☀
Irregular brown or yellow spots on leaves are an early symptom of this fungal disease, which can infect many vegetable crops. Check the undersides of affected leaves; presence of a hairy white or purple mold confirms the diagnosis. Severely infected leaves may die, and the disease can eventually spread to stems, flowers, and fruit.
The fungus overwinters on plant debris. Downy mildew is a host-specific disease. Thus, if your cucumber plants become infected, that doesn’t necessarily mean your onions will succumb.
Prevention and Control Grow mildew-resistant varieties such as Fanfare cucumber and Allstar melon. Late-season crops tend to be more vulnerable to downy mildew. Plant disease-free seeds and plants. Space plants widely to promote good air circulation. This will help leaf surfaces stay dry, which inhibits infection. Keep foliage as dry as possible by using drip irrigation or soaker hoses rather than overhead watering. Control weeds, such as wild mustard, that can harbor the disease.
0
0
文章
Dummer. ゛☀
2017年09月13日
Dummer. ゛☀
Northern corn leaf blight appears on corn leaves as distinct, grayish green to tan blotches or streaks up to 6″ long. Southern corn leaf blight causes smaller tan spots with reddish brown borders. Young corn plants are most susceptible to these fungal diseases, and if the infection is severe the plants may die.
Corn leaf blight is usually associated with commercial corn plantings. Wet, humid weather favors the spread of the disease and under these conditions corn leaf blight may also infect backyard corn plantings. The fungus overwinters on infected plant debris in the soil.
Prevention and Control Plant blight-resistant varieties, such as Sugar Buns. Purchase only certified disease-free seed. Rotate corn to avoid planting it in the same location more than once every three years. Clean up the garden at the end of the growing season Compost infected cornstalks in a hot compost pile (material must reach the disease-killing temperature of 150 degrees F for several days) or destroy them.
0
0
文章
Dummer. ゛☀
2017年09月13日
Dummer. ゛☀
An early symptom of bacterial wilt is drooping leaves on squash or cucumber vines — even when the plants have been well watered. This happens because the wilt bacteria clog the vascular systems of plants, blocking the flow of water and nutrients from the roots to the leaves. If infected stems are cut open, they may release a milky sap. As the disease spreads, leaves turn brown. Eventually the entire plant shrivels and dies.
Bacterial wilt can occur in all plants in the squash family except watermelons; another type of bacterial wilt can infect tomatoes and beans. There’s a direct link between bacterial wilt and insects. The bacterium overwinters in the gut of cucumber beetles and grasshoppers; when these insects emerge the following spring, they spread the bacterium as they feed. The severity of disease is typically proportional to the amount of feeding by the host insects.
Prevention and Control Plant disease-free seed, and choose wilt-resistant cucumber varieties such as County Fair. Prevent cucumber beetle from feeding on susceptible plants. Keep plants in good health; cucumber beetles are more likely to target weakened plants. Uproot and destroy infected plants or add them to a hot compost pile.
0
0
文章
Dummer. ゛☀
2017年09月13日
Dummer. ゛☀
This disease produces small, dark irregular spots on tomato and pepper leaves; leaves eventually turn yellow and drop off. This defoliation weakens plants and exposes developing fruits to sunscald. Small, dark, wartlike raised spots with slightly sunken centers may appear on green fruits. Rot organisms are able to enter the fruit at these spots and cause decay. Bacterial spot symptoms are similar to, and often indistinguishable from, bacterial speck.
Very warm, wet weather encourages the development of the disease. The bacteria overwinter in plant residues. This disease is a problem mainly in the East and Midwest.
Prevention and Control Purchase certified disease-free seeds. Remove volunteer tomato and pepper plants, which may harbor the bacteria. Use a three- to four-year crop rotation for susceptible crops. Space plants well apart and support vines to ensure good air circulation. Use drip irrigation or soaker hoses instead of overhead watering to keep foliage as dry as possible. Keep the soil surface covered with mulch to prevent spores from splashing up from the soil surface. Remove infected plant parts from the garden and destroy them or add them to a hot compost pile.
0
0
文章
Dummer. ゛☀
2017年09月13日
Dummer. ゛☀
In the vegetable garden, bacterial blight is most often a problem on snap beans and lima beans. (Note that other crops also suffer from bacterial diseases that may be called bacterial blight.) Symptoms of infection are large, water-soaked, pale green spots on leaves that later turn brown. These spots may also appear on pods and can produce a yellowish ooze in wet weather. Leaves infected with halo bacterial blight develop many small dead spots with yellow halos around them; spots on pods produce a cream-colored ooze.
The bacterium overwinters on plant debris and in the soil. High humidity and wet weather promote the spread of the disease.
Prevention and Control Use a three-year crop rotation for beans. Space rows and seeds more widely than usual to allow good air circulation among plants. Don't work in the garden when plants are wet. Splashing water spreads bacteria among plants. Use drip irrigation or soaker hoses rather than overhead watering. Uproot infected plants and destroy them. Do not save and plant seeds from infected plants.
0
0
文章
Dummer. ゛☀
2017年09月13日
Dummer. ゛☀
Water-soaked lesions between the veins of leaves are a telltale symptom of this bacterial disease, which infects cucumbers, summer squash, and melons. Symptoms often first appear on the underside of leaves. As infected areas in the leaf die, the tissue becomes brittle and those leaf parts fall away, giving afflicted leaves a ragged appearance. Angular leaf spot lesions may exude a milky fluid that dries on leaf surfaces. In severe outbreaks, lesions may also develop on stems and fruit.
The bacterium overwinters in the soil on seeds and plant residues, and is spread by rain splash and wind. Angular leaf spot is especially prevalent in warm, humid climates.
Prevention and Control Plant vegetable varieties that are well-suited to your particular climate, and when possible, choose varieties such as Olympian cucumber that are resistant to angular leaf spot. Practice a two- or three-year crop rotation of cucumbers and other squash-family crops to break the disease cycle. Prevent the spread of disease by destroying infected plants and any that are in close proximity to them. Splashing water spreads bacteria. Avoid overhead watering and use drip irrigation or soaker hoses to keep foliage as dry as possible. Avoid working in garden when plants are wet. Avoid overfertilizing; excess nitrogen produces tender growth that is more vulnerable to infection
0
0
文章
Dummer. ゛☀
2017年09月03日
Dummer. ゛☀
A relative of willow, aspen, alder, ponderosa pine and snowberry, growing chokecherry trees are commonly found in the foothills and mountain canyons, at elevation of 4,900 to 10,200 feet and along streams or other damp areas. Let’s learn more about how to use chokecherries in the home landscape.
What is a Chokecherry? So, what is a chokecherry? Growing chokecherry trees are large suckering shrubs (small trees) that are indigenous to the Southeastern United States but may be grown as a perennial landscape specimen elsewhere. Prunus viginiana can attain heights of up to 41 feet tall with a canopy of 28 feet across; of course, this is extremely rare and generally the plant can be maintained to a size of about 12 feet tall by 10 feet wide. Chokecherry trees bear 3- to 6-inch long creamy white blooms, which become dark red fleshy fruit, maturing into a mature purple black with a pit in the center. This fruit is used to make jams, jellies, syrups and wines. The bark has at times been used to flavor cough syrups. Native Americans utilized the bark extract as a cure for diarrhea. Fruit from growing chokecherry trees was added to pemmican and used to treat canker sores and cold sores. Leaves and twigs were steeped to create a tea to ease colds and rheumatism while the wood of the chokecherry was made into arrows, bows and pipe stems.
How to Use Chokecherry in the Landscape Chokecherry is commonly used as a windbreak on farms, riparian plantings, and for highway beautification. Due to its suckering habitat (and potential toxicity), care should be take when determining where to plant chokecherries. In the garden landscape, chokecherry may be utilized as a screen or in mass plantings, being aware of its propensity for suckering and multiplying. Also, keep in mind that deer love to graze on chokecherry trees, so if you don’t want deer, you don’t want chokecherry trees.
As a landscape planting, you can grow and harvest chokecherry fruit in the fall; the later the reaping, the sweeter the fruit. Remove the toxic stems and leaves when cleaning the berries and do not crush the seeds when cooking or juice extracting. Thus, common sense would tell you not to put the berries in the blender! Chokecherry fruit is a rich source of dietary fiber with 68 percent of the daily recommended allowance, 37 percent DRA of vitamin K, and a terrific source of manganese, potassium and vitamin B6 with just 158 calories per half cup.
Chokecherry Planting Instructions Chokecherry shrubs grow most abundantly in moist soils but are adaptable to a variety of soil mediums in the soil pH arena of 5.0 to 8.0. Cold hardy to USDA zone 2, wind resistant, moderately drought and shade tolerant, chokecherry planting instructions are pretty minimal as it is not particularly picky about where it is situated. That said, in nature, growing chokeberry trees are often found near water sources and will, thus, be most lush with adequate irrigation while full sun also promotes fruiting.
Additional Information on Growing Chokecherry Trees In the wild, chokecherry is primarily noted for its role in providing habitat, as a valuable food source for wildlife and watershed protection. All parts of the growing chokecherry trees are eaten by large mammals such as bears, moose, coyotes, bighorn sheep, pronghorn, elk and deer. Birds munch on its fruit, and even domestic cattle and sheep browse on the chokecherry. The leaves, stems and seeds contain a toxin, called hydrocyanic acid, which may rarely cause poisoning in domestic animals. Livestock must eat significant quantities of the toxic plant parts which do not normally occur except in times of drought/famine. Poisoning signs are distress, bluish tinge to the mouth, rapid breathing, salivation, muscle spasm, and finally coma and death.
0
0
文章
Dummer. ゛☀
2017年09月03日
Dummer. ゛☀
If you are looking for a tree suitable for a xeriscape landscape, one with ornamental attributes which also fulfills a valuable niche for wildlife, look no further than the Chinese pistache tree. If this piques your interest, read on for additional Chinese pistache facts and care of Chinese pistache.
Chinese Pistache Facts The Chinese pistache tree is, as mentioned, a notable ornamental tree, especially during the fall season when the normally dark green foliage changes to a dramatic profusion of orange and red leaves. An excellent shade tree with a broad canopy, Chinese pistache will attain heights of between 30-60 feet. A deciduous tree, the one foot long pinnate leaves consist of between 10-16 leaflets. These leaves are mildly aromatic when bruised. Pistacia chinensis, as the name suggests, is related to the pistachio; however, it does not produce nuts. Instead, if a male Chinese pistache tree is present, the female trees bloom in April with inconspicuous green blossoms that develop into clumps of brilliant red berries in the fall, changing to a blue-purple hue in the winter.
While the berries are inedible for human consumption, the birds go nuts for them. Keep in mind that the bright colored berries will drop and may stain or create a slippery walkway. If this is a concern, consider planting P. chinensis ‘Keith Davey,’ a fruitless male clone. Native to China, Taiwan and the Philippines, Chinese pistache grows at a moderate pace (13-24 inches per year) and is relatively long lived. It is also tolerant of many soil types as well as being drought tolerant with roots that grow deep into the soil. The bark of growing Chinese pistache is grayish-brown and, if peeled from the tree, reveals a shocking salmon pink interior. So what are some landscape uses for Chinese pistache trees?
Chinese Pistache Uses Chinese pistache is not a fussy tree. It can be grown in USDA zones 6-9 in a variety of soils as long as the soil is well draining. It is a sturdy tree with deep roots that make it an ideal specimen for near patios and sidewalks. It is heat and drought tolerant and winter hardy to 20 degrees F. (-6 C.) as well as relatively pest and fire resistant. Use Chinese pistache anywhere you would like to add a shade addition to the landscape with the bonus of an opulent fall appearance. This member of the Anacardiaceae family also makes a lovely container specimen for the patio or garden.
Care of Chinese Pistache The Chinese pistache is a sun lover and should be situated in an area of at least 6 hours of direct, unfiltered sunlight per day. As mentioned, Chinese pistache isn’t picky about the soil it’s grown in as long as it drains well. Choose a site of not only plenty of sun, but with fertile soil deep enough to accommodate the long taproots and at least 15 feet away from nearby structures to account for their growing canopies. Dig a hole as deep as and 3-5 times as wide as the root ball of the tree. Center the tree in the hole, spreading the roots out evenly. Refill the hole; don’t amend it, as it is not necessary. Tamp the dirt down lightly around the base of the tree to remove any air pockets. Water the tree in well and spread a 2- to 3-inch layer of mulch around the base, away from the trunk to discourage fungal disease, rodents and insects.
Although Chinese pistache trees are fairly disease and pest resistant, they are susceptible to verticillium wilt. Avoid planting them in any area that has had previous contamination. Once the tree has been planted, continue to water twice a week for the next month while the tree acclimates. Thereafter, check the soil once a week and water only when the top one inch is dry. Feed trees under 5 years old in the spring and fall with a nitrogen based fertilizer. Use one that is supplemented with superphosphate only if they are growing less than 2-3 feet per year to give them a boost.
Young Chinese pistache should be pruned in January or February to facilitate their signature umbrella shape. When trees are six feet tall, prune the tops of the trees. As branches emerge, choose one as the trunk, another as a branch and prune out the remainder. When the tree has grown another three feet, prune them to 2 feet above the previous cut to encourage branching. Repeat this process until the trees are symmetrical with an open canopy. Keep leaf debris and fallen berries raked up from around the trees to prevent unwanted seedlings.
0
0
文章
Dummer. ゛☀
2017年09月03日
Dummer. ゛☀
Yangmei fruit trees (Myrica rubra) are predominantly found in China where they are cultivated for their fruit and used as an ornamental along streets and in parks. They are also referred to as Chinese bayberry, Japanese bayberry, Yumberry, or Chinese strawberry trees. Because they are indigenous to eastern Asia, you’re probably not familiar with the tree or its fruit and right about now are wondering what the heck is yangmei fruit. Read on to find out about growing Chinese bayberry trees and other interesting Chinese bayberry info.
What is Yangmei Fruit? Yangmei fruit trees are evergreens that produce purplish round fruit that looks somewhat like a berry, hence their alternate name of Chinese strawberry. The fruit is actually not a berry, however, but a drupe like cherries. That means that there is a single stone seed in the center of the fruit surrounded by juicy pulp. The fruit is sweet/tart and high in antioxidants, vitamins and minerals. The fruit is often used to make healthy juices as well as being canned, dried, pickled and even made into an alcoholic wine-like beverage. More often marketed as “Yumberry,” production has increased rapidly in China and is now also being imported into the United States.
Additional Chinese Bayberry Info Chinese bayberry is of significant economic value south of the Yangtze River in China. In Japan, it is the prefectural flower of Kochi and the prefectural tree of Tokushima where it is commonly referenced in ancient Japanese poems. The tree has been of medicinal use for over 2,000 years for its digestive qualities. The bark is used as an astringent and to treat arsenic poisoning as well as skin disorders, wounds and ulcers. Seeds are used to treat cholera, heart problems and stomach issues like ulcers.
Modern medicine is looking at the high levels of antioxidants in the fruit. They are believed to sweep free radicals completely from the body. They also protect the brain and nervous system and are purported to prevent cataracts, skin aging, and to relieve arthritis. The fruit juice has also been used to reduce blood pressure and to restore the malleability of blood vessels as well as to treat diabetes.
Growing Chinese Bayberry It is a small to medium sized tree with smooth gray bark and a rounded habit. The tree is dioecious, meaning male and female flowers bloom on individual trees. When immature, the fruit is green and matures into a dark red to purple-red color. If you’re interested in growing your own Chinese bayberry plants, they are hardy to USDA zone 10 and thrive in sub-tropical, coastal regions. Yangmei do best in sun to partial shade. They have a shallow root system that does best in sandy, loamy, or clay soil with excellent drainage and that is either slightly acidic or neutral.
1
0
文章
121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136
相关用户
茉莉花
茉莉花
来自： Faye
朝阳
绿萝
绿萝
来自： 采元气少女✨
长沙
茉莉花
茉莉花
来自： 小松树快乐
长沙
绿萝
绿萝
来自： 水中月
赣州市
茉莉花
茉莉花
来自： 艺源
广安市
芦荟
芦荟
来自： 采元气少女✨
长沙
茉莉花
茉莉花
来自： 阿罗
南昌
芦荟
芦荟
来自： Bailu_Yuan
北京
白掌
白掌
来自： 韩凯
武汉
绿萝
绿萝
来自： 阿罗
南昌
举报 反馈

您有什么意见或建议，欢迎给我们留言。

请输入内容
提交
取消
设置
VIP
退出登录
关闭
分享

分享好文，绿手指（GFinger）养花助手见证你的成长。

关闭
请前往电脑端操作

请前往电脑端操作

关闭
转发
插入话题
提醒好友
发布
/
提交成功 提交失败 最大图片质量 成功 警告 啊哦！ 出了点小问题 转发成功 举报 转发 显示更多 _zh 文章 求助 动态 刚刚 回复 邀你一起尬聊！ 表情 添加图片 评论 仅支持 .JPG .JPEG .PNG .GIF 图片尺寸不得小于300*300px 最少上传一张图片 请输入内容