How to treat plant diseases and insect pests by spraying

When we plant plants, we often encounter the threat of diseases and insect pests, but the use of pesticides for treatment will not only pollute the environment, but also make ourselves vulnerable to some harm. The editor will introduce you to a method of spraying without pesticides to treat plant diseases and insect pests.

Chinese rose

1. Soak 0.5 kg of plant ash with 2.5 kg of water for 24 hours and spray flowers and trees with its filtrate to kill aphids on plum blossoms, rose flowers and pomegranate trees.

2. Spraying flowers and trees with 0.1% baking soda solution can control powdery mildew on rose, chrysanthemum, impatiens, hibiscus, melon and leaf chrysanthemum, and the prevention and treatment rate can reach more than 80%.

3. Spraying flowers and trees with 2% urea every 10 days for 3 times can not only kill aphids, red spiders and other pests, but also brighten the leaves of flowers and trees, and make the flowers large and beautiful.

Control methods of diseases and insect pests of foliage plants

Foliage plants may be damaged by diseases and insect pests in the process of growth. The damaged plants not only affect their growth, but also reduce or even lose their ornamental value. therefore, the prevention and control of indoor foliage plant diseases and insect pests is very necessary, which is a basic skill that flower lovers need to master. Otherwise, it will lose the true meaning of foliage plants to beautify and purify the environment.

There are many kinds of indoor foliage plants, but for each unit or family, the number of applications is small, and the management is more meticulous. If there are diseases and insect pests, although it is not easy to spread to other plants, but the damaged plants tend to develop rapidly. Therefore, the prevention and control methods of diseases and insect pests of this kind of plants are mainly prevention, comprehensive control, strengthening tending management at the same time, creating a good plant ecological environment, promoting plant growth and health, improving its own resistance and other effective cultivation measures.

Before entering the indoor layout, all indoor foliage plants should be strictly inspected, disease-resistant varieties or healthy plants with strong adaptability should be selected and arranged rationally. if slight diseased leaves or a small amount of aphids, mites and scale insects are found, physical methods should be used in time, such as manual pruning, removal of diseased leaves, or washing with soapy water, and then rinse with clean water or wipe with a soft wet cloth. Scale insects can also be gently scraped off with bamboo sticks; if the damage is serious, remove them from the room for treatment.

Indoor foliage plants should not be treated indoors with pesticides, because pesticides are generally toxic substances, which will lead to many adverse consequences if such toxic substances are retained or brought into the indoor air ventilation system. As a kind of decoration, indoor foliage plants often attract people to appreciate their various characteristics, such as some people will smell them, others will touch their branches and leaves. In order to maintain a good relationship of public interest, it should be stipulated that indoor decorative plants do not use pesticides to control diseases and insect pests. If some plants are harmed by diseases and insect pests and cannot be effectively controlled by physical methods, they must be moved outdoors and isolated from indoor healthy plants. Then make other treatments, such as chemical control, or destruction. The plants in the human room must be checked regularly, treated and prevented in time, so as to reduce the degree of plant damage, prevent trouble, keep the room clean, ventilated and transparent, and keep the foliage plants green and fresh, with high ornamental value.

1. Physical control methods

The following lists some common diseases and insect pests of foliage plants, and puts forward suggestions on indoor physical control methods:

Aphids: aphids are small and soft insects that often damage the top tips and tender leaves of begonia, ivy, blood amaranth, Araliaceae and other plants. During prevention and treatment, the leaves can be washed with water or soapy water, or the damaged parts can be removed.

(2) mites: mainly damage the leaves of tortoise back bamboo, variable leaf wood, vine green velvet, rubber tree, hanging bamboo plum and other plants, spread from the lower leaves to the upper, absorb the nutrients of new buds and leaves, and change the color of the leaves. When preventing and controlling, you can sprinkle water from the leaves and rinse mites. Those who do serious harm should be removed immediately.

(3) scale insects: often cause damage to the branches and leaves of leafy wood, bamboo taro, dragon blood tree and pineapple, which often gather on branches and leaves to absorb nutrients. The environment of high temperature, high humidity, poor ventilation and light transmission is the suitable condition for the occurrence of scale insects. Therefore, attention should be paid to strengthening ventilation and light transmission and improving indoor strips. The spread of scale insects is very small, so to do a good job of quarantine, without insect materials, is the most effective control measures. If scale insect damage has occurred. Scale insects can be scraped off with bamboo sticks, or the damaged parts can be cut off.

(4) thrips: damage to the leaves of begonia, hyacinth, poinsettia, etc., often near petioles and veins, crawling on the leaf surface to absorb nutrients. Resulting in loss of green leaves and loss of vitality. If a small number of plants are killed, they can be wiped off with alcohol cotton or washed with soapy water.

(5) anthrax: harmful to wind pears, dragon blood trees, variable-leaf trees, pepper grass, rubber trees, orchids and so on. Invade the leaves, causing black spots on the leaves. The prevention and treatment of this disease should mainly strengthen management, maintain good light transmission and ventilation, avoid watering when watering, should be watered from the edge of the basin, if there are damaged leaves, the diseased leaves should be cut off in time.

(6) Rust: it is harmful to the leaves of Rosaceae and orchid. Orange spots appeared on the leaf surface in the early stage, and brown spores appeared on the back of the leaf in the later stage. Prevention and control methods: disinfect the cultivation medium in advance, strengthen environmental management, maintain ventilation and light transmission, and remove diseased leaves if necessary.

(7) Brown spot: damage to the leaves of dragon blood tree, tortoise back bamboo and palm. Small regular brown spots appeared on the leaves at the initial stage of the damage, and turned gray and white in the later stage. Slowly dry and scorch and die. Prevention and control methods: artificial pruning of diseased leaves and withered branches, and concentrated burning.

(8) soft rot: it is harmful to the leaves of orchid and reticulate grass. At the initial stage, water-immersed spots appeared on the leaf surface and petiole, and then wilted and drooped, losing ornamental value. Attention should be paid to careful management in prevention and control, to avoid watering the leaves and to cut off the damaged branches and leaves.

(9) powdery mildew: damage to Compositae and Rosaceae plants, causing damage to leaves. During the prevention and treatment, we should strengthen the management, keep the room with good ventilation and light transmission, and cut off the diseased leaves.

2. Chemical control methods

If the above physical control methods do not work, the plants should be moved outdoors and chemical control should be carried out. The commonly used methods are:

The main results are as follows: (1) foliar spraying pesticides: according to their different insecticidal mechanisms, pesticides can be divided into three types: internal suction type, contact type and protective treatment type. In the internal inhalation type, insecticides include omethoate, which mainly control scale insects, mites and aphids, and fungicides such as carbendazim, methyl topiramate, etc. It is effective for leaf spot, anthracnose, brown spot, rust and so on. Contact insecticides include dichlorvos and pyrethroids, which can kill larvae, aphids and newly hatched scale insects of chewable mouthparts. Protective and therapeutic pesticides mainly form a film on the surface of plants, which can protect, treat or kill diseases and insects, such as stone sulfur mixture, sulfur gel suspension, polymer membrane and so on.

(2) soil application of pesticides: the effective components of these pesticides can be absorbed by the roots of plants and spread to all parts of the plant to kill leaf painting diseases and insects, or directly kill diseases and insects in the soil, such as formaldehyde and other drugs.

Prevention and control of ground cover plant diseases and insect pests

Ground cover plants often form landscape with group beauty, and close planting method is often used when planting, so the prevention of diseases and insect pests should be paid great attention to.

1. Chlorosis

When the ground cover plants are planted on the unimproved alkaline soil, there are more yellowing of leaves, which not only affect the ornamental, but also die in serious cases.

Prevention and control methods:

1. Improve the soil before sowing. Before planting land cover, the soil should apply more organic fertilizer, reduce the soil PH value, and improve the soil organic matter content and fertility, which is the basic and effective method of soil improvement.

2. Do a good job of fertilization in the later stage. Through late fertilization to continue to adjust the soil PH value, generally using potassium dihydrogen phosphate solution and mature bean cake, grass, ferrous sulfate soaking mixture alternately spraying method. If you insist on doing so during maintenance, there will generally be no serious yellowing. If appropriate prevention and treatment methods are not taken, once yellowing occurs, yellowing can also be alleviated or cured by treatment. In the growing season, the solution of 600 times concentration of potassium dihydrogen phosphate can be sprayed at the root of 25 grams per plant (if the plant is more than 60 cm ~ 50 cm, the dose can be increased accordingly). At the same time, 100 times concentration of solution can be used for foliar spray, once a week for 3 months. Practice has proved that the whole plant yellowing, but the leaves have not yet shrunk plants will all turn green, at this time the determination of soil PH value will be found to be significantly decreased.

Potassium dihydrogen phosphate is a strongly acidic compound fertilizer with a PH value of 4.2 to 4.6, which contains 28% potassium and 22% phosphorus. It can not only give more phosphorus and potassium fertilizer to the ground cover, but also play a certain role in regulating soil pH and improving the availability of various mineral elements in the soil. In addition, in some areas, the soil is sour but the content of organic matter is low, and the poor soil will also cause the soil to be yellowed, so organic fertilizer and proper lime should be applied to control it.

Red spiders and aphids

These worms are tiny, but often cause fatal harm to the vital parts of the plant (leaf bases and buds, etc.). A large number of mites and aphids often appear on the flowers and leaves of azaleas and chrysanthemums in spring, making the leaves show yellow-green markings and even cause fallen leaves, seriously drilling in the buds so that the full-looking buds wither before they bloom.

Prevention and treatment methods: 2000 times of 20% avermectin or 1000 times of acephate EC can be prevented and treated. The main thing is to observe the insect situation and control it in time once it is found, once a week, 2 or 3 times.

Botrytis cinerea, coal pollution and brown spot

Some land is located at the bottom of the community, and the environment is generally damp. The warm and rainy season will lead to gray mold, coal pollution and brown spot, which will seriously affect the ornamental effect of ground cover.

Prevention and treatment methods: the prevention and control drugs can be used 800 times 75% chlorothalonil, 500 times 50% carbendazim and 60% zinc benzoate, 200 times equal volume Bordeaux solution and 700 times 50% carbendazide.

Ground tigers, grubs, etc.

These underground pests will bring harm to some delicate grasses and should be controlled in time to keep the ground covered evenly.

In a word, the prevention and control of diseases and insect pests of ground cover plants focuses on prevention, and the key is to create a suitable growth environment and improve the health level of ground cover plants. With the increase of variety and the improvement of cultivation and management measures, it is believed that ground cover plants will add more color to the beautiful ecological environment.