What are the pests and diseases of potted flowers?

harm

This is a non-communicable disease, which mainly occurs in some areas south of the Yangtze River and between the Yangtze River and Jianghuai. By the end of March, the daytime temperature has reached above 20, and many people can't wait to move potted ornamental plants outdoors for conditioning and maintenance. At this time, there is often cold air going south, and there is an inversion weather of "late spring cold". The minimum temperature in the morning often drops below 4, causing the newly sprouted leaves of some tropical flowers to "freeze". Common, such as white orchid, Milan, jasmine, Clivia, Daifen leaf, Jerusalem artichoke, upside down golden bell, arrowroot, Anthurium andraeanum, poinsettia and so on. Will seriously affect the normal growth of that spring.

solution

Keep abreast of the weather forecast of the local meteorological station. In case of "late spring cold" special weather, a small number of potted plants that have been moved outdoors can be moved back to the greenhouse or indoors; If you move many potted plants outdoors, you can gather them together and cover them with double plastic films. In the Yangtze River valley and its northern areas, outdoor activities are generally not allowed until Tomb-Sweeping Day or the end of the "final frost period". Measures such as opening doors and windows and adding electric fans can be taken to cool down, and doors and windows can be closed at night to gradually adapt to the outdoor environment.

Disease 2: powdery mildew

harm

It mainly harms ornamental plants such as rose, crape myrtle, Mahonia, Euonymus japonicus and Polygonum. It mainly harms leaves, petioles, pedicels, buds and branches. The damaged part was covered with white powder. In severe cases, leaves turn yellow, tender leaves curl and contract thicker, flower buds die, deformed flowers appear, and tender branches bend shorter.

solution

Sulfur fumigation in March, an electric fumigator was used in the shed, and sulfur powder was built in, so the sealing fumigation had good control effect.

Disease 3: Anthrax

harm

It mainly harms camellia, camellia, yemen iron, hydrangea, Clivia, evergreen, orchids, spider eggs, epiphyllum, rubber trees, cyclamen and so on. In the greenhouse. It mainly harms leaves, young branches and fruits. The focus is nearly round, grayish brown, and turns grayish white in the later stage, with obvious concentric wheel lines and small black spots similar to wheel lines.

solution

The layout density of the whole potted flower, the plants planted on the ground and the row spacing will improve the ventilation conditions. When the soil in the basin is dry, water it properly to increase the resistance of plants. At the initial stage of the disease, 500 times of 80% anthrax thiram wettable powder or 800 times of 50% polysulfide suspending agent were alternately sprayed every 10 day for 2-3 times continuously.

Disease 4: gray mold

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With the rising air, excessive humidity and poor ventilation, gray mold is still one of the main diseases of indoor flowers. Harm gerbera, rubber tree, chrysanthemum, cyclamen, poinsettia, geranium, begonia, green radish, dragon boat flower, hibiscus, Anthurium andraeanum and other potted flowers, especially the leaves and petals are seriously infected.

solution

After March, it is necessary to strengthen ventilation and light transmission, reduce indoor air humidity, and prohibit spraying water on the leaves at night to prevent moisture from staying on the leaves for a long time. For plants at the early stage of the disease, 65% zineb WP500 times or 50% carbendazim WP 1000 times can be sprayed alternately around noon, once every 10 day, and continuously for 2-3 times.

Disease 5: sooty blotch

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In March, 2006, due to poor indoor ventilation and high humidity, it was impossible to completely eliminate sucking insect pests such as scale insects, aphids and whiteflies found in citrus, Milan, hibiscus, Prynne, Michelia, Malva, Ficus, Camellia, Bambusa bambusa, Rhododendron and Gardenia.

solution

Strengthen indoor ventilation, timely kill aphids, scale insects, whiteflies and other insect vectors that induce sooty blotch. Several leaves on individual plants are stained with coal stains, which can be removed by scrubbing with a wet cloth dipped in low-concentration washing powder water. At the initial stage of the disease, 500-fold solution of 50% methylthio suspension or 500-fold solution of 75% chlorfenapyr wettable powder can be used to spray the diseased branches and leaves once every 15 days for 2-3 times continuously.

Pest 6: scale insects

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Potted ornamental plants placed in greenhouses are still the main pest species due to the limitation of ventilation conditions, insufficient light and high humidity.

Such as green scales on kumquat, gray scales on yew, giant scales on hibiscus, chaff scales on Clivia, turtle scales on camellia, turtle scales on holly, black helmet scales on cycads and oyster shields. The species of scale insects on each flower vary greatly.

Prevention and cure method

You can use cotton wool dipped in 75% spray liquid or washing powder liquid to wipe off the scale insects on a few plants at home. For smaller scale insects, such as scale insects, Bai Dun scale insects, etc. Scotch tape can be used to remove live insects. Or spray with 25% Oxfam WP 2000 times, every 15 days 1 time, twice in a row.

Pest 7: Aphids

harm

The harm of aphids to indoor ornamental plants will be more serious when the temperature rises and the amount of watering increases. Aphids sting the sap of newly pumped branches and leaves will affect the normal growth of plants after spring.

Prevention and cure method

For aphids on a few plants, tobacco powder, plant ash or slag ash can be sprinkled on the insect body and leaves first, and after about 1-2 hours, most aphids can be killed by washing with clear water.

Pest 8: whitefly

harm

It is mainly greenhouse whitefly, which harms chrysanthemum, hibiscus, rose, nasturtium, lantern flower and so on. Secondly, Bemisia tabaci is harmful to kumquat, golden bean, hawthorn, bergamot, rose, Prynne and Milan. Their harmfulness cannot be underestimated.

Prevention and cure method

In severe cases, 2000 times of 10% imidacloprid wettable powder or 2500 times of 25% Puxiling wettable powder can be used.