你知道#长春花 为什么会长黑斑吗？有花友说长春花叶面上有黑色小斑点不知道是什么病，其实，这就是常见的黑斑病，这种病会危害长春花的叶和茎，在发病初期，长春花叶片出现黑褐色小斑点，随着时间推移，它会不断的扩大，变成各种不规则的大斑，那么长春花长黑斑怎么办呢？下面为您介绍长春花长黑斑的原因和解决方法： [图片]长春花黑斑病是由真菌引起的，时间久了叶子变成红褐色，中心变灰白色坏死。随着斑点增多、变大，整叶变褐枯死。茎秆从叶柄基部开始发病，纵向发展为长条形黑褐色斑。 这个时候，如果是地栽，花友应该实行轮作，选择排水良好的地块种植，然后跟盆栽一样，要及时清除病叶和病茎。最后，用65%代森锌600倍液，或70.5%代森锰锌600倍液喷1次，喷药时要将叶片的正反面都喷到。 [图片]【小贴士】长春花会发生黑斑病主要发生在高温多雨后，一般是由于链格孢真菌感染，这种病菌会在长春花的植株病残体上越冬，种子会成为初侵染源，可传播病菌，所以发生黑斑病的长春花种子最好不要再用。

Scientific Name Camellia nitidissima C.W.Chi [图片]Common Names Yellow Camellia. Golden Camellia Synonyms Camellia nitidissima var. nitidissima Scientific Classification Family: Theaceae Subfamily: Cactoideae Tribe: Cacteae Genus: Camellia [图片]Flower Color: Yellow Bloom Time: Midwinter to midspring Description Camellia nitidissima is a shrub or small tree growing up to 16.4 feet (5 m) in height. The leathery, elongated, oval leaves are glossy, emerald green and have dimpled veins across the surface. Flowering occurs from from midwinter to midspring. The cup-shaped, waxy blooms are light to canary yellow and semi-double and comprised of petals that curve inward like those of a rose. In the center of each blossom is a dense cluster of golden-orange stamens. New foliage unfolds in both spring and autumn. [图片]How to Grow and Care Choose a large rugged pot, terracotta, wood or stone, and part fill with ericaceous compost and then add your plant and back fill so that the level of the pot is level with the soil. Water well, preferably with water taken from a water butt. If you do use tap water, which tends to be alkaline, allow it to stand for a morning first. Re-pot every other year into fresh potting compost. In the intervening years remove the top 2 inches (5 cm) of compost and add fresh compost. You can re-pot back into the same pot if you trim off up to a third of the roots to make room for fresh potting compost, or go up into a larger pot. This regime will keep your Camellia happy. Camellias are fast-growing tap-rotted plants and the new growth can snap off in windy positions so staking is advisable for the first few years until the Camellia becomes bushy. They do tolerate windy conditions however, once established, and are often used as windbreaks in gardens where they thrive. Origin It is endemic to the Guangxi Zhuang Autonomous Region in southern China and northern Vietnam.

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室内养殖#长寿花 很容易生白粉病，发现这种情况如果不及时处理可能引起严重后果，比如导致长寿花植株死亡。那么，长寿花白粉病怎么办呢，怎样预防长寿花白粉病？下面为您介绍长寿花白粉病的预防与治疗方法。 预防方法：注意通风问题，不要一直养在室内，注意多晒点太阳。 [图片]治疗方法： 1、可以用粉锈宁解决，也可以用酒精擦拭，甚至硫磺粉也可以。 2、可以喷洒灭菌灵或者粉能达，这两者可以算是白粉病的特效药，喷施后可被长寿花迅速吸收，消灭害虫。 3、自制小苏打溶液：取5克小苏打（又名碳酸氢钠），先用少量酒精使其溶解，然后加水约1000克，配成0.5%浓度的溶液，喷洒植株，可防治长寿花白粉病。 [图片]【小贴士】长寿花要摆放在有散射阳光的地方，不要放在阳光暴晒或者过于荫庇的地方，平时注意松土施肥，花后可以修剪，可以塑造出你喜欢的造型提高欣赏价值。

Scientific Name Camellia japonica L. [图片]Common Names Camellia, Japanese Camellia, Rose of Winter Synonyms Camellia bonnardi, Camellia bonnardii, Camellia florida, Camellia hayaoi, Camellia hozanensis, Kemelia japonica, Thea japonica Scientific Classification Family: Theaceae Subfamily: Cactoideae Tribe: Cacteae Genus: Camellia [图片]Flower Color: From pure white to deep red Bloom Time: Winter to spring Description Camellia japonica is a flowering tree or shrub, up to 20 feet (6 m) tall, but occasionally up to 36 feet (11 m) tall. The alternately arranged leathery leaves are dark green on the top side, paler on the underside, up to 4 inches (10 cm) long. The flowers, which range in color from pure white to deep red, are up to 4 inches (10 cm) in diameter and are produced from winter to spring. [图片]How to Grow and Care Choose a large rugged pot, terracotta, wood or stone, and part fill with ericaceous compost and then add your plant and back fill so that the level of the pot is level with the soil. Water well, preferably with water taken from a water butt. If you do use tap water, which tends to be alkaline, allow it to stand for a morning first. Re-pot every other year into fresh potting compost. In the intervening years remove the top 2 inches (5 cm) of compost and add fresh compost. You can re-pot back into the same pot if you trim off up to a third of the roots to make room for fresh potting compost, or go up into a larger pot. This regime will keep your Camellia happy. Camellias are fast-growing tap-rotted plants and the new growth can snap off in windy positions so staking is advisable for the first few years until the Camellia becomes bushy. They do tolerate windy conditions however, once established, and are often used as windbreaks in gardens where they thrive. Origin Native to China, Taiwan, southern Korea and southern Japan.

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近来不少网友说他新买的#栀子花 长虫子了，心急如焚的问我该怎么办？到底栀子花长虫子了怎么办，栀子花长虫子用什么药呢？别急，下面为您分析介绍栀子花的各种虫害和防治方法： 1、刺蛾 可以用2.5%敌杀死乳油3000倍液喷杀栀子花上的刺蛾。 [图片]2、介壳虫和粉虱 对于栀子花介壳虫，可用竹签刮除，也可用20号石油乳剂加200倍水进行喷雾防治。粉虱的话，可以用40%氧化乐果乳油1500倍液喷杀。 3、蚜虫 不多的话，用手捏死它们就行了。多的话，可以用抽完的烟屁股，将烟屁股泡水，用灌喷壶喷洒可以让蚜虫尼古丁中毒，从而达到杀虫效果，而且对栀子花不会产生什么不良影响。 [图片]【小贴士】栀子花在通风不良及温湿度过高的情况下，容易发生介壳虫和煤烟病，要注意通风问题，也别将栀子花放在湿度高的环境里，如果分辨不出害虫种类，可以喷一下花店的百虫灵，一般这样也可以杀死栀子花的害虫。

Scientific Name Calliandra haematocephala Hassk. [图片]Common Names Red Powder Puff, Powder Puff Tree Synonyms Calliandra haematocephala var. haematocephala, Calliandra inaequilatera, Calliandra novaesii, Feuilleea haematocephala, Anneslia haematocephala Scientific Classification Family: Fabaceae Subfamily: Mimosoideae Tribe: Ingeae Genus: Calliandra [图片]Flower Color: Red Bloom Time: Fall and winter Description Calliandra haematocephala is a spreading well-branched shrub or small tree, up to 15 feet (4.5 m) tall. Branches are brown, cylindric, and rough. Leaves are pinnately compound, oblong, acute, with 5 to 10 pairs of glossy green leaflets. Flowers are clustered in globose heads, up to 3 inches (7 cm) across. Stamens are numerous, long and silky, very brilliant, pink to red. [图片]How to Grow and Care Powder Puff plants are not especially difficult to grow indoors, but it can be tricky coaxing them to bloom. They prefer regular moisture, high humidity, bright light and high temperatures. In the absence of these conditions, they will not grow as vigorously and will likely not bloom at all. If you have a conservatory or sunroom, you’ll likely have more success. Powder Puffs are not especially susceptible to pests, but will sometimes suffer from infestations of mealybugs, aphids, and mites. Signs of infestation include tiny webs on plants, clumps of white “powdery” residue, or visible insects on the plant. Treat infestations as soon as possible to prevent them from spreading to the rest of your collection. As always, start with the least toxic treatment option first, only progressing to more serious chemicals if your initial efforts fail. Repot in the early spring (when you take cuttings). In their native habitat, Powder Puff plants grow to medium-sized shrubs or small trees, depending on the year-round conditions and species. Indoors, they won’t become that large, but if your plant is very healthy and thriving, it can easily outgrow your pot and overpower the space. To keep it smaller, only repot every other year. Origin Native to tropical America.

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#地老虎 是一种多食性作物害虫，主要有小地老虎、黄地老虎、大地老虎等。危害蔬菜的主要是小地老虎和黄地老虎，分布最广、危害严重的是小地老虎。是多食性害虫，主要以幼虫危害幼苗。幼虫将幼苗近地面的茎部咬断，使整株死亡，造成缺苗断垄，下面介绍怎么治吃红薯的地老虎。 红薯地老虎生活习性：成虫的趋光性和趋化性因虫种而不同。小地老虎、黄地老虎、白边地老虎对黑光灯均有趋性；对糖酒醋液的趋性以小地老虎最强；黄地老虎则喜在大葱花蕊上取食作为补充营养。卵多产在土表、植物幼嫩茎叶上和枯草根际处,散产或堆产。3龄前的幼虫多在土表或植株上活动，昼夜取食叶片、心叶、嫩头、幼芽等部位，食量较小。3龄后分散入土,白天潜伏土中，夜间活动为害，常将作物幼苗齐地面处咬断，造成缺苗断垄，有自残现象。 [图片]红薯地老虎防治方法： （1）播种后即在行间或株间进行撒施。毒饵配制方法：①豆饼（麦麸）毒饵：豆饼（麦麸）20－25公斤，压碎、过筛成粉状，炒香后均匀拌入40%辛硫磷乳油0.5公斤，农药可用清水稀释后喷入搅拌，以豆饼（麦麸）粉湿润为好，然后按每亩用量4－5公斤撒入幼苗周围。②青草毒饵：青草切碎，每50公斤加入农药0.3－0.5公斤，拌匀后成小堆状撒在幼苗周围，每亩用毒草20公斤。油渣，炒香后用90%敌百虫拌匀，洒在幼苗周围可以诱杀地老虎，蝼蛄等多种地下害虫。　 　　 [图片]（2）化学防治：在地老虎1-3龄幼虫期，采用48%地蛆灵乳油1500倍液、48%乐斯本乳油或48%天达毒死蜱2000倍液、2.5%劲彪乳油2000倍液、10%高效灭百可乳油1500倍液、21%增效氰•马乳油3000倍液、2.5%溴氰菊酯乳油1500倍液、20%氰戊菊酯乳油1500倍液、20%菊•马乳油1500倍液、10%溴•马乳油2000倍液等地表喷雾。

[图片]#含笑花 不通风容易得粉虱病，这种时候肉眼就可以看到白色的有翅小飞虫，严重的时候可能引起枯梢，诱发烟煤病，除了让含笑花通风外，还要对这些害虫采取防治措施。 如果是含笑花盆栽，一般在粉虱发生后就能发现，不会等到它大量繁殖，这个比较好治理，可以自制黄板油刹成虫，具体方法如下： 用纸板或塑料板，剪成1米×0.3米左右长方形，漆成桔黄颜色，再涂上一层黏油（机油加少许黄油调匀），置于园中，与栀子花高度相当，然后振动枝条，诱杀成虫。 [图片]如果不是盆栽，而是大量种植，那就要采取农业措施或者化学防治了，具体的下面花匠大叔为您介绍： 1、农业措施：加强含笑花的栽培管理，注意剪除病虫枝、密生枝，保证园内通风透光，同时也要搞好排水，减少氮肥多施磷肥钾肥。 2、物理和生物防治：用丽蚜小蜂防治烟粉虱，当每株棉有粉虱0.5-1头时，每株放蜂3-5头，10天放1次，连续放蜂3-4次，可基本控制其为害。 [图片]3、化学防治：选择药剂为90%敌百虫800—1000倍，或用40%氧化乐果乳油1500倍液，或25%扑虱灵1500倍，或10%吡虫啉1500倍，或1.8%阿维菌素2000倍，或25%阿克泰3000—5000倍，可兼治蚜虫；20%螨克1000—1500倍，可兼治红蜘蛛，每7天左右喷1次，连续2—3次。 注意事项：喷药时，注意以叶背为主，且连同地面杂草及周围寄主一起喷；由于寄生蜂对菊酯类农药十分敏感，现阶段防治应少用菊酯类农药，以利保护天敌；在花蕾期慎用绿颖乳剂，做好药剂筛选、混用及交替使用；适时组织统防统治，采取防病先防虫的办法。

Scientific Name Calliandra calothyrsus Meisn. [图片]Common Names Red Calliandra Synonyms Calliandra confusa, Anneslia calothyrsa, Anneslia confusa, Anneslia similis, Feuilleea calothyrsa Scientific Classification Family: Fabaceae Subfamily: Mimosoideae Tribe: Ingeae Genus: Calliandra [图片]Flower Color: Purple or red Bloom Time: It can flower throughout the year, but usually has a peak flowering period three months before the onset of the dry season Description Calliandra calothyrsus is a small tree or a large shrub. It is usually 13.1 to 20 feet (4 to 6 m) high but might reach a height of 40 feet (12 m) under favorable conditions. The stems are quite small, up to 1 foot (30 cm) in diameter. The bark is blackish-brown. The canopy is dense with alternate, petiolate, bipinnately compound leaves of up to 1 foot (30 cm) lengths, which are folding together at night. It has both superficial and deep-growing roots. While the above-ground parts are only short lived, the roots are able to sprout up to 20 years. The flowers are subterminal inflorescences with numerous long, hair-like purple or red stamens. Flowering starts 3–6 months after planting. [图片]How to Grow and Care Powder Puff plants are not especially difficult to grow indoors, but it can be tricky coaxing them to bloom. They prefer regular moisture, high humidity, bright light and high temperatures. In the absence of these conditions, they will not grow as vigorously and will likely not bloom at all. If you have a conservatory or sunroom, you’ll likely have more success. Powder Puffs are not especially susceptible to pests, but will sometimes suffer from infestations of mealybugs, aphids, and mites. Signs of infestation include tiny webs on plants, clumps of white “powdery” residue, or visible insects on the plant. Treat infestations as soon as possible to prevent them from spreading to the rest of your collection. As always, start with the least toxic treatment option first, only progressing to more serious chemicals if your initial efforts fail. Repot in the early spring (when you take cuttings). In their native habitat, Powder Puff plants grow to medium-sized shrubs or small trees, depending on the year-round conditions and species. Indoors, they won’t become that large, but if your plant is very healthy and thriving, it can easily outgrow your pot and overpower the space. To keep it smaller, only repot every other year. Origin Native to the tropics of Central America where its typical habitat is wet tropical forests or seasonally dry forests with a dry season of four to seven months, when it may become deciduous.

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[图片]#绿萝 是很多人喜爱的一种植物，它不仅有很强的空气净化能力，在办公室里放盆绿萝还可以舒缓紧绷的神经和放松疲劳的眼睛。但在养殖过程中花友们可能会发现，绿萝叶子比较容易发黄，那么绿萝叶子发黄是怎么回事呢？绿萝叶子发黄怎么办呢？下面介绍绿萝叶子发黄的原因和解决方法。 1、浇水不当：过量浇水或者不浇水都会造成绿萝叶子发黄，如果叶子暗淡没光泽，可能就是浇水过多，叶梢或边缘枯燥发干就是浇水不足。 [图片]2、阳光照射：绿萝喜欢阴凉处生长，暴晒或者强光照射会让花卉叶梢、叶缘发枯，叶片会出现黄斑。相反，长时间放在阴暗环境，叶子无法进行光合作用也会导致叶片发黄。最好放置在适当光线下，比如白炽灯。 3、肥黄：绿萝养殖施肥过多、浓度过大，或不缺肥都可能造成绿锣叶子发黄，当施肥过多时，绿锣叶面肥厚而无光泽，且叶面观感不舒展，老叶片现黄脱落，可通过冲洗减少肥料。而缺少肥料时，叶面颜色会变淡，呈淡绿或黄色状，应及时补充肥料，严重要的换盆土。 【小贴士】如果要将发黄的叶子去掉，注意不能直接拽，可用剪刀从叶柄的中间剪断，避免水分流失过多，对绿萝生长造成不好的影响。