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Flower knowledge

Common flower pests and diseases and treatment methods

Release time: 2016-07-21 Edit: admin Clicks: 310
  As the temperature rises, all kinds of diseases and insects become active. How are your flowers?In fact, since the temperature began to warm up in March, all kinds of pests have emerged, and what we can do is to prevent them。If you can't do it, get ready to kill it!

Flower common disease one: cold spring
This is a non-infectious disease,It mainly occurs in the south of the Yangtze River and some areas between the Jianghuai River,By the end of March, daytime temperatures had exceeded 20 degrees Celsius,Many people are eager to move the potted ornamental plants in the home to the outside for conditioning and maintenance;At this time, cold air often moves south,There is a reverse weather of "cold spring",The lowest temperature in the early morning often drops below 4 ° C,Some of the original tropical flowers have just drawn the new shoots and young leaves are "frozen" bad。

Common such as albus, Milan, jasmine, Clividian, Dai-powder leaves, fruit taro, inverted golden bell, arrowroot, anacarpus, poinsettias, etc., will seriously affect the normal growth of the spring of that year。

Grasp the weather forecast of the local meteorological station in time, and encounter the special weather of "cold spring", a small number of potted plants that have been moved outdoors can be moved back to the greenhouse or indoors;If there are more potted plants moved outside, they can be gathered together and covered with a double plastic film。

In the Yangtze River basin and its northern regions, generally must wait for the Qingming or "frost period" after the end, and then move to the outside, you can open the doors and Windows, add electric fans and other measures to cool down, and then close the doors and Windows at night, so that it has a process of gradually adapting to the outdoor environment。

Two common diseases of flowers: powdery mildew
It is mainly harmful to ornamental plants such as rose, crape Myrtle, Tengma, Buxus macrophyllum and Polygonum polygonum。It is mainly harmful to leaves, petioles, peels, buds and tender tips. The affected parts are covered with a layer of white powder. In severe cases, the leaves turn yellow, the young leaves curl, wrinkle and become thick, the buds die, deformed flowers appear, and the tender tips bend and shorten。

Sulfur powder fumigation In March, the use of electric heating fumigator in the shed, built-in sulfur powder, sealed fumigation, has a good control effect。

Flower common disease three: Anthrax
The main harm in the greenhouse camellia, tea plum, Yemen iron, hydrangea, Clivia, evergreen, orchid, spider egg, Epiphyllum, rubber tree, Cyclamen and so on。It is mainly harmful to leaves, shoots and fruits. The spots are nearly round and grayish brown. Later, the spots turn to grayish white, with obvious concentric wheel patterns and whorled (or scattered) small black spots。

The whole pot flower placement density and planting plants, row spacing, improve ventilation conditions。When the pot soil is dry, water it properly to increase the resistance of the plant。

At the beginning of the disease, use 80% of anthrax Forme wettable powder 500 times liquid, or more than 50%?Sulfur suspension 800 times liquid, alternately spray, once every 10 days, 2-3 consecutive times。

Flower common disease four: gray mold
With the recovery of gas, excessive humidity and poor ventilation, gray mold is still one of the main diseases of indoor flowers。Harm gerbera, rubber tree, melon chrysanthemum, cycleen, poinsettia, geranium, Rig begonia, green plants, dragon boat flower, fusang, anthurium and other potted flowers, especially the leaves, petals are seriously susceptible to disease。

After March, it is necessary to strengthen ventilation and light transmission, reduce indoor air humidity, and prohibit spraying water on the leaf surface in the evening to prevent moisture from staying on the leaf surface for a long time。

For the plants at the early stage of the disease, 65% of the zinc wettable powder 500 times liquid, or 50% of the polymyxin wettable powder 1000 times liquid, alternately spray, once every 10 days, for 2-3 consecutive times。

Flower common disease five: coal pollution
3月份,Due to poor ventilation conditions and high humidity in the room,Insect insects such as scale, aphids and whitefly cannot be completely eliminated,In citrus, Milan, Fusao, alba, michelia, fishtail sunflower, banyan tree, camellia, palm bamboo, rhododendron, gardenia, bone Holly, Fujian tea and other plants on the leaves and fruits,Coal contamination still occurs。

Strengthen indoor ventilation, timely kill aphids, scale insects, whitefly and other pests induced by coal pollution disease。

A small number of leaves on individual plants are infected with coal contamination, which can be scrubbed with wet cloth with low concentration of washing powder water to remove the coal contamination layer。

At the beginning of the disease, 50% of the nail can be used?Spray the branches and leaves of infected plants with 500 times liquid of sulfur suspension or 500 times liquid of 75% chlorothalonium wettable powder, once every 15 days, 2-3 times in a row。

Six common insect pests in flowers: scale crustaceans
For potted ornamental plants placed in sheds, scale insects are still the main pest species due to restricted ventilation conditions, insufficient light and high humidity。

Like the green psilococcus on the kumquat,Grey Mealy scale on yew,Meecoccus manensis on Fusao, Chaetococcus furfurus on Clivium,Turtle wax scale and red wax scale on camellia,Cerococcus sinensis on ilex,Black helmet scale and oyster shield scale on Cycad,Platyaspis sinensis on the Chinese rose,White Aspidaspis caulii on Michelia and Albus,Pelagic scale on the hand of the Buddha,The giant tuber on orchids,White scale on brown bamboo,The ivy ivy scale,Cocoanea cocci on the loose tail,The sagittal Aspidaspis on the four seasons Laurel, etc。The species of scale beetles on each flower are very different。

Control method
The scale insects that appear on a small number of plants in the family can be wiped with 75% of the sprinkling powder in the cotton, or wiped with washing powder。For the smaller scale insect, such as Apical scale and white Aspidaspis caui, the live insect body can be stained with scotch tape。

Or spray with 2000 times the liquid of 25% of phulin wettable powder, once every 15 days, twice in a row。

Flower common insect pests seven: aphids
With higher temperatures and more watering, aphids on indoor ornamental plants are more dangerous。Aphids suck the SAP of newly extracted branches and leaves, which will affect the normal growth of plants after spring。

Control method
For a small number of aphids on the plant, you can first use tobacco dust, plant ash or furnace slag ash sprinkled on the insect body and leaves, about 1-2 hours later, and then rinse with water, you can kill most of the aphids。

Eight common flower pests: whitefly
It is mainly white whitefly in greenhouse, which is harmful to melon leaf, Fusaria, rose, nasturtium, lantern flower, etc.Next is the orange thorn whitefly, harm kumquat, golden bean, Daidai, Buddha hand, rose, alba, Milan, etc., their harm can not be underestimated。

Control method
In severe cases, 10% of imidacloprid wettable powder can be used in 2000 times the liquid, or 25% of Pipholin wettable powder 2500 times the liquid。