How to control diseases and insect pests of camellia?

Camellia leaf spot is serious in the rainy season in the south. First, silver-gray small round spots appear on the leaves, and then they get bigger and bigger, and finally many disease spots merge together, producing many small black spots. These black spots are conidia of pathogens, which fall on other leaves and can continue to develop the disease and enlarge the disease.

When transporting camellia from the south to the north, we must do a good job in quarantine and do not bring in diseased plants. The pathogen of leaf spot disease likes low temperature and humidity, so it is very likely to occur in the greenhouse maintenance stage in winter. Once the diseased leaves are found, they should be removed and burned immediately, otherwise the whole plant will spread.

At the initial stage of the disease, half-dose Bordeaux solution can be sprayed 2 times for 3 times; if the condition is already serious, 1000 times dilution of 50% antimicrobial wettable powder should be sprayed once every 10 days for a total of 3 times, with good results.

What about the growing insects of potted camellias? disease and pest control of camellias (spraying insecticides)

With the progress of pot technology, camellia has become a scenic spot in many people's homes. Insects can grow in any plant, and camellia is no exception. What about the camellia worms? Camellia common pests are aphids, stem borer, red spiders, for each different insect, its control methods are not the same, let's take a look at camellia pest control.

What about the camellia worms? spray to kill the insects.

Camellia is very common in life, and its unique flowers and fragrance are loved by people. Earlier, we talked about how to raise camellias, the efficacy and function of camellias. Now let's talk about one of the most common problems: what to do with camellias and the prevention and control of diseases and insect pests of camellias. There are many common pests in camellias, and each method of prevention and control is also different. Let's explain one by one below.

II. Control of diseases and insect pests of camellia

1. Aphids

Aphids are divided into winged aphids and wingless aphids. Aphids will cluster on the tender shoots of camellias to absorb juice, which will shrink the bud leaves of the injured camellias and seriously affect their growth. At the same time, the excrement of aphids can also cause bituminous disease.

Control methods: in the early stage of being injured by aphids, camellia plants can be sprayed with 2000 times of 50% phosphamine milk or 50% dimethoate emulsion every 3 to 5 days, and aphids can be eliminated about 3 times. Another method is to use 0.5 kg of cigarette sticks, 0.25 kg of quicklime, add water (about 10 to 15 liters), soak for one day and night, filter and remove slag after spray prevention.

2. Scale insects

What about the camellia worms? It's probably the kind of bug that looks like this. There are many species of scale insects, among which three kinds of scale insects are seriously harmful to camellias. The number of eggs laid by scale insects is very large, and each female can lay about a thousand eggs, which can lay 3 or 5 times a year. Therefore, when it is serious, the branches and leaves are covered with scale insects to absorb leaf liquid. The damaged leaves changed from green to grayish green and finally to yellow, resulting in the death of the whole plant.

Control methods: because most of the insects are concentrated, it is easier to find that the insect can be killed directly on the branches and leaves when the number is small in the early stage. If the number of insects is relatively large, it is necessary to grasp the characteristics of weak drug resistance of newly hatched nymphs and grasp the period of drug application. The body surface of the adult is waxy, and the effect of spraying is poor.)

3. Stem borer

Harm the branches of camellias, so that the killed branches wither and die. The harm is usually from March to April and from August to September.

Control method: cut off and burn the branches that give birth to stem borer, and trap and kill adults with light. During the peak period of adult Eclosion, 20% dimethoate emulsion 500 times or 90% trichlorfon 1000 times solution can be sprayed, and 90% trichlorfon 500 times solution can also be used in larval stage.

4. Dendrolimus spiniferus

Absorb the sap on the leaves, harm the insects of camellia leaves, its secretion can also lead to a large number of bituminous coal disease, seriously affect the normal photosynthesis of camellias, serious will cause a large number of falling flowers and other phenomena.

Control method: cut off the branches and leaves with insects and burn them centrally in winter or early spring. In the nymph incubation period, you can use imidophos, marathon, or dimethoate spray, once every 7 days, can be effectively controlled. Through the above answers, I believe we all know how to do camellia insects, camellia disease and pest control bar, let's take a look at camellia disease control.

III. Disease control of camellia

1. Anthrax

This disease is one of the common diseases of camellia, which usually occurs on the leaves of flowers and seedlings from June to July, and the disease spot starts from the leaf tip or leaf edge. At the beginning, water-stained green-brown disease spots appeared at the edge of the basal leaves, and then expanded into a layer of small black spots arranged in irregular large stripes to spread to the whole leaf, and finally caused the leaves to fall off.

Control methods: strengthen cultivation management, pay attention to the application of organic fertilizer and phosphorus and potassium fertilizer, improve plant disease resistance, remove diseased leaves and burn them in time. After the spring shoot grows, spray with 1% Bordeaux liquid to prevent bacterial infection. At the initial stage of the disease, 65% Dyson zinc wettable powder was sprayed with 600 times aqueous solution, or 70% methyl topiramate wettable powder 1000 Mel 1500 times was sprayed.

2. Soot disease

The disease can damage the branches and leaves, especially on the leaves. At the initial stage of the disease, soot-like mildew spots appeared in the disease, and then gradually expanded and connected to each other into pieces, so that most of the plants were covered by soot-like mildew layer. After parasitism, the pathogen not only absorbs the nutrients of flowers, but also seriously affects the photosynthesis and respiration of plants, resulting in a large number of fallen leaves.

Control methods: planting should not be too dense, keep the plants in good condition of ventilation and light transmission. Do not make the humidity too high, control the conditions for the growth of germs. During the onset of the disease, Baume 0.3 degree stone-sulfur mixture was sprayed once every 10 seconds for 15 days, for a total of 3 times. You can also use 50% tophan wettable powder 500 times liquid spray, 7 murine once every 10 days, spray 3 times, can receive the therapeutic effect.

3. Root knot nematode disease

The disease harms the roots of camellias, turning them dark brown and causing nodules to rot and break. The main root was enlarged, the new beard was not born, and the ground plant stopped growing, which gradually led to the death of the whole plant.

Prevention and control methods: disinfect the cultivated soil and kill the disease-causing insects before putting on the pot. Immediately after ② found the patient, the sterilized culture soil was used as the basin soil to change the basin. Before changing the basin, the potted soil can be used again after 3 days of exposure in the scorching sun factory. The soil can be disinfected by spraying the soil with dibromochloropropane and 100Mel 150 times water, but the soil after using this drug must be stacked for 20 days before it can be planted in the pot. Otherwise, it will damage the root system. The above is the whole content of the prevention and control of camellia diseases and insect pests, and what to do about camellia insects. I hope I can help you.

Control techniques of diseases and insect pests of camellia

Camellia leaf spot is serious in the rainy season in the south. First there are small silver-gray spots on the leaves, and then they get bigger and bigger. Finally, many disease spots are mixed together, and many small black spots are produced on it. These black spots are the meristematic clasps of pathogens, which fall on other leaves to continue to develop the disease and enlarge the disease.

When transporting camellia from the south to the north, we must do a good job in quarantine and do not bring in diseased plants. The pathogen of leaf spot disease likes low temperature and humidity, so it is very likely to occur in greenhouse maintenance stage in winter. Once diseased leaves are found, they should be removed and burned immediately, otherwise they will spread to the whole plant.

Half-dose Bordeaux solution can be sprayed 2-3 times at the initial stage of the disease; if the condition is already serious, 1000 times dilution of 50% antimicrobial wettable powder should be sprayed. Spray once every 10 days for a total of 3-4 times. The effect is good.