Common Cherry Tree Pests | eHow
Showy, versatile cherry trees (Prunus spp.) play a dual role gardens as an ornamental tree and a fruit crop. Both sweet cherries (Prunus avium) and sour cherries (Prunus cerasus) provide fragrant blossoms in spring and edible fruit in late summer -- and both are susceptible to the same pests. Pests rarely cause serious damage to healthy cherry trees, although some can decimate entire crops and must be eliminated.
Sweet cherries thrive in U.S. Department of Agriculture plant hardiness zones 5 to 7, while sour cherries grow best in USDA zones 4 to 6.
Most cherry trees will attract insect pests at one point or another. Although most are relatively benign, some pose a more serious threat.
Spider mites overwinter in leaf matter around the base of cherry trees, then emerge in summer during hot weather. Although small colonies of spider mites can be safely ignored, larger outbreaks can cause problems for younger cherry trees. Signs of infestation include:
Yellowish stippling on leaves
White, silky web-like matter that increases in density when mite populations are high
Treat infestations by spraying the tree with commercially prepared insecticidal soap every five to seven days until the problem subsides.
Black cherry aphids pose a low to moderate risk to cherry trees when they feed on the tree’s sap. Smaller colonies can be ignored, although advanced infestations can cause stunted growth in young trees. Signs of infestations include:
Black sooty residue on foliage
Sticky or curled leaves
Pear sawfly larvae resemble slimy, dark green slugs. They feed on the leaf epidermis, creating a lacy appearance on the foliage. Their damage is cosmetic and they don't require treatment. Look for:
Skeletonized leaves
Visible “slugs” on the leaves
One common and serious insect pest that plagues cherry trees is the western cherry fruit fly. These flying pests lay their eggs in developing fruit, and those mature into maggots that render the fruit inedible. Signs of an infestation don’t appear until after the fruit has ripened and is already damaged, so watch for adult western cherry fruit flies early on. They are fly-like insects with distinctively striped wings.
Apply a commercially prepared spinosad- or carbaryl-based insecticide to the host tree every seven days starting when the fruit has developed a salmon-pink blush. Cultural controls such as mulch or grass over the tree's root zone will prevent the larvae from entering the soil, which will impede their life cycle.
Wear protective gear such as gloves, goggles, long sleeves and a face mask when working with insecticides.
Birds and animal pests such as raccoons often plague cherry trees, feasting on the fruit throughout the growing season. Both can be controlled using nonlethal and humane measures such as barriers.
The best method for dissuading birds from pecking cherries is to cover the tree with bird . Cover the tree early in the season after pollination but before the first damage appears. Drape netting over the entire canopy, then gather the open end together and secure it around the trunk with rope or twist ties.
Larger cherry trees may be too large to cover with netting. To reduce the amount of effected fruit, hang shiny or noisy items such as disposable pie pans, old CDs or mylar balloons to the tree to scare the birds off.
A determined raccoon will almost always find a way to pilfer cherries, but you can reduce their impact by making access to the tree's canopy more difficult. The best way to dissuade raccoons is to install a heavy plastic or metal barrier around the trunk. Use a 24-inch-long galvanized stove or vent pipe sliced lengthwise down one side to wrap around the trunk. Alternatively, install motion lights and play a radio near the tree to scare the hungry rascals away.
Raccoons will still climb into trees if they have other access points such as from a rooftop or neighboring tree.
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Life Made Easier.Hibiscus & Pests | eHow
Protecting hibiscus from insect and pest interference is an important step in keeping the plant healthy and making sure it will bloom for many seasons. There are numerous types of insects
learning the tell-tale signs of an infestation, as well as effective control methods for each type of insect, can go a long way toward safeguarding the health of your plant.
Aphids (melon aphid or cotton aphid) are among the most common pests of hibiscus plants. Aphids, like other types of insect, threaten the health of the plant by feeding on juices inside the plant's vasculature. If an aphid infestation is recognized while the population is small, control easily can be affected by improving air circulation among plants or simply spraying them with pressurized water. Serious infestations can be treated with insecticidal soap or insecticidal sprays rated for aphid control.
Spider mites also are a common pest problem for hibiscus plants. Like aphids, they feed on the plant's internal juices and can threaten the health and life of your hibiscus plants if left untreated. Control methods closely mir ensure proper air circulation, spray with pressurized water, or treat with insecticidal soap or contact insecticide. The key to controlling a spider mite infestatio the larger a spider mite population, the harder it is to remove from your hibiscus plants.
Rather than feeding on the plant's internal juices, pests such as caterpillars, grasshoppers, snails and slugs, beetles, cutworms, and leaf miners feed on the outside anatomy of the plant including its leaves, buds and flowers. Resort to the use of chemical insecticides only as a last result. Introduction of natural predators such as nematodes and wasps is a favorite natural method of pest control for gardeners. Predators can either feed on the pests in their adult form or parasitize the larvae of the pest.
Hibiscus are highly sensitive, relative to similar plants, to chemical insecticides. It usually is preferable to spray insecticides in the early morning and not later in the day, particular in hot, sunny climates. Always purchase insecticides rated to kill the exact species of pest that is attacking your hibiscus and follow all manufacturer's application instructions meticulously.
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Life Made Easier.stores of ---are frequently attacked by pestsA corn B crop C wheat D grain 选哪个 迷糊了 都是不可数名词吧?题干中的be动词为什么是are呢?
选Bstores of 是复数形式啊
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其他类似问题
扫描下载二维码麋鹿是鹿科家族中体型最大的成员。
The moose is the largest member of the deer family.
那是黑白相间的马达加斯加大狐猴，狐猴中体型最大的一种——仅存于马达加斯加岛上的一种小型灵长类。
It is the black-and-white indri, largest of the lemurs — a type of small primate found only in Madagascar.
卡尔·林奈（CarlLinnaeus）于1758年首次描述的大天鹅（Cygnus cygnus）可被视为天鹅中的天鹅，即所有天鹅的模式种（typespecies），同时它也是天鹅家族中体型最大的一种。
First described by Carl Linnaeus in 1758, Cygnus cygnus can be considered a swan among swans, the type species, hence archetype, of all swans. It is also a swan of superlatives.
至少还有一个情况例外，没有使鲨鱼遭到灭顶之灾：鲨鱼中体型最大的鲸鲨在澳大利亚西海岸繁衍昌盛。
At least one exception to the dire situation: The biggest sharks of all, whale sharks, are thriving off the coast of western Australia.
小羊驼是骆驼家族中体型最小的成员。
The vicuna is the smallest member of the camel family.
这里是寒冷的北方。这是猫科动物中体型最大的动物——虎的脚印；
I'm in the frozen north and this is the trail of the biggest of all cats, the tiger.
这是寒冷的北方。这是猫科动物中体型最大的动物——虎的脚印。
I'm in the frozen north and this is the trail of the biggest of all cats, the tiger.
老虎是野生猫科动物中体型最大的一种，它们以权力和力量而着称。
Tigers are the largest of all wild cats and are renowned for their power and strength.
东北虎是虎中体型最大者，分布于俄罗斯远东和西伯利亚，北朝鲜和我国东北长白山，远达山和小兴安岭林区。
The manchurian tiger is that the tiger is hit by maximal person of shape , scatter in Russia Far East and Siberia, North Korea and our country northeast China Mt.
这些能以高分贝吼叫的猴子新世界猴中体型最大的。
The highly vocal howler monkey is the largest of the New World monkeys.
还有戴维斯的敏捷，这个在NBA 中体型很特殊的球员，我想的他的敏捷影响到了奥当。
And the quickness of Davis, who's a rather unusual player in the NBA with his size, still his quickness is, I think, affecting Lamar.
打倒这么一只巨大和强壮的动物并不容易。所以雌狮叫来了预备队–狮群中体型巨大的雄狮。
It's not easy to bring down an animal this huge and powerful. So the lionesses call in the reserves – the giant males of the pride.
它们是鸽子家族中体型最纤细的，翅膀宽大，圆圆的头，黝黑的喙，尾巴长而尖细。
They are the most slender bird in the pigeon and dove family, and have broad wings, with a round head, very dark beak, and a lengthy tapering tail.
老虎是猫科动物中体型最大的一种，它们以权力和力量而着称。
Tigers are the largest members of the cat family and are renowned for their power and strength.
眼镜王蛇，眼镜王蛇体长可达5.7米左右，有剧毒，是所有剧毒蛇中体型最长的一种，多见于亚洲且致死率很高。
The king cobra, the king cobra can grow up to around 5.7 meters, it is extremely venomous. It is the longest of the venomous snakes. It is mainly found in Asia and is very lethal.
结果表明：（1）克木人男性、女性均属于偏内胚层的中胚层体型；
The results are as follows:(1) The mean somatotype in both sexes is Endo-mesomorph category.
随着年龄的增长，男孩体型变化较小，大多属中胚层体型，女孩体型变化较大。
The boy somatotype changed a little, while the girls changed in large extent with age.
蚜虫是半翅目中一类体型较小的昆虫，广布于世界各地，其中绝大部分是农林害虫。
As a large group of Hemiptera , aphids are distributed worldwide, and most of them are pests.
早期秦的青铜器与其他诸侯国的横向对比研究中，以体型大小、纹饰修饰、造型三方面为标准。
In my article in horizontal comparison between bronzes in the early stage of Qin and bronzes of the other Princes, I used the body size, the decoration and modification, the modeling as the standard.
你还记得《猫和老鼠》中那个体型庞大的中年非裔女佣“两只鞋太太”吗？她的生活就是整日收拾房间并威胁汤姆猫要把他扔出去。
Do you remember the heavy-set middle-aged black maid Mammy Two Shoes in Tom and Jerry, whose life consists of cleaning up around the house and threatening to throw Tom out?
结果表明：（1）男生6—8岁各组为均衡的中胚层体型，9—12岁各组为三胚层中间型体型，13—17岁各组为中胚层-外胚层均衡型体型。
The results showed: (1) Among boys, the mean somatotypes in age groups 6—8 are balanced mesomorph, 9—12 are central, and change to meso ectomorph in age 13—17;
我认为，到了一定年龄的妇女不必在面容和体型中做出选择。
And I don’t believe a woman of a certain age has to choose between her face and her figure.
我们合作发展了肿瘤细胞是一种返祖现象这个理论，当远古基因的沉寂被扰乱时，返祖现象就会出现在成体型中。
Together we developed the theory that cancer tumours are a type of atavism that appears in the adult form when something disrupts the silencing of ancestral genes.
也是在这个阶段，女性会经历整个怀孕过程中最大的体型变化。
It is also during this period that a woman will experience the most significant physical changes that will occur during the course and term of the pregnancy itself.
原始马的体型只有野兔大小，但是在进化过程中他们的体型逐渐增大。
Primitive horses were about the size of a hare, but during the course of evolution their size gradually increased.
原始马的体型只有野兔大小，但是在进化过程中他们的体型逐渐增大。
Primitive horses were about the size of a hare, but during the course of evolution their size gradually increased.
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