What about the yellowing of sunflower leaves, applying thin fertilizer / temperature control / water replenishment / shading / pest control

Sunflower is a kind of green plant with high ornamental value, which can be seen in many parts of our country, but even if the ornamental plant is highly ornamental, its overall beauty will be affected if it yellowed. What about the yellowing of sunflower leaves? Next, the editor will take you to learn about it.

First, how do the sunflower leaves turn yellow? find the reason.

If you want to know what to do with the yellowing of sunflower leaves, first of all, we need to know what is the cause of this phenomenon, and then we can solve the problem. If there is too little watering at ordinary times, too strong light is one of the reasons for this phenomenon, as for how to solve it? Next, the editor will take you to learn about it.

Second, the causes of yellowing of sunflower leaves (with solutions)

1. Improper fertilization

In the process of breeding sunflower, if we do not apply fertilizer or apply thick fertilizer for a long time, it is one of the reasons for the yellowing of sunflower leaves. If we do not apply fertilizer for a long time, it will dry up and turn yellow due to lack of nutrients, while applying thick fertilizer will easily burn the plant.

Solution: in the growth process of sunflower, we usually replenish fertilizer once before the Spring Festival, the Dragon Boat Festival and the Mid-Autumn Festival, and when fertilizing, we should remember to dilute the fertilizer with water first and keep the principle of thin fertilizer applied frequently. so it can be better absorbed.

two。 The temperature is too low

Sunflower has high requirements for environmental temperature in the process of growth, and this kind of plant is not cold-resistant. If we do not properly control the temperature in the process of breeding, resulting in low ambient temperature, it is easy to cause sunflower leaves to turn yellow, and if the temperature is too low, it is also easy to frostbite or even freeze to death.

Solution: in the growth process of sunflower, it is very important to let it grow in a comfortable ambient temperature, its suitable temperature is between 18-26 ℃, and after entering the middle of October every year, we have to move it indoors to overwinter, and the indoor temperature should be controlled at no less than 5 ℃.

3. Too little watering

In the process of breeding sunflower, especially after it enters the growing period, the demand for water is very high, especially in summer, its leaves will wilt and wither if it is not watered for a day, and the plant will wither and die if it is short of water for a long time.

Solution: if it is caused by too little watering, we do not have to pour water immediately, but step by step. If we irrigate too much at one time, it is easy to cause the plant to rot. Generally speaking, you can water once every 2-3 days in spring and autumn, but you need to water every day in summer to keep the soil moist.

4. The light is too strong.

Sunflower is a kind of light-loving plant, if the light is more suitable in spring and autumn, we can keep it outdoors and let it receive light all day, but it is more afraid of strong light, so it still needs shade after entering summer. otherwise, if the light is too strong, it is easy to burn the plant and yellowing leaves.

Solution: if the problem is caused by too much light, we should keep it indoors in half-shade in time, so that the leaves of a section of plants will slowly turn green.

5. Diseases and insect pests infestation

In the growth process of sunflower, if we do not maintain properly, it is easy to appear some bad phenomena such as diseases and insect pests, which do great harm to the plant, not only affect its ornamental, but also cause the leaves of sunflower to turn yellow and dry.

Solution: when there are diseases and insect pests and other problems, we must deal with them in a timely manner. If the time is prolonged, the damage to the plant will be great, and it will be more troublesome to deal with it. For specific prevention and control methods, you can refer to the article on pest prevention and control of Pukui. I won't repeat it here.

What to do with the growth of insects? control of diseases and insect pests / 2 pests 2 diseases

In the process of breeding sunflower, the last thing we want to encounter is diseases and insect pests, this kind of problem is very harmful to the plant, which will not only affect its ornamental, but also lead to the phenomenon of plant death. So what if Pukui has worms? What do you need to do to prevent and control diseases and insect pests in Pukui? Next, the editor will take you to learn about it.

First, what should Pukui do when the worm grows? find the reason.

If you want to know what to do when Pukui grows, first of all, we need to know what kind of insect it is, so that we can deal with different diseases and insect pests, because the treatment methods of each kind of diseases and insect pests are different. Details are introduced below. Interested friends can learn about it.

II. Pest control of sunflower (pest)

Heart-drilling worm

The drillworm is a pest of Lepidoptera, which mainly harms the heart leaves of sunflower seedlings, resulting in withered heart. if we do not deal with it in time, it will gradually nibble on the lower part of the plant and cause the death of the whole plant.

Control method: when we deal with this kind of sunflower diseases and insect pests, we can use 8-1000 times liquid omethoate or 21% EC 2000 times to directly spray the pests.

Aphids

Aphids are one of the most destructive pests on earth, which are harmful to many plants, and sunflower is one of them. The main damage of this pest is that adults and nymphs feed on leaves, stems, tender heads and tender panicle sap, resulting in a large loss of plant nutrients and wilting.

Control method: when we deal with this kind of sunflower disease and insect pest, we can spray it with 3000 times of aldicarb wettable powder or 2.5% 3000 times of methomyl emulsion.

III. Pest control of sunflower (disease)

Leaf spot disease

Leaf spot is a common plant disease, its high incidence period is generally in spring and autumn, when the disease occurs, many oval brown disease spots will appear on the leaves of sunflower, and with the passage of time, the disease spot will gradually spread, and the color will slowly become darker. Finally, the plant can not carry out photosynthesis and die.

Control methods: for this kind of sunflower diseases and insect pests, we can use 1000 times of silazole ·prochloraz to spray the diseased plants, which is usually sprayed once every 7-10 days, and can be cured after 2-3 times.

Leaf blight

Leaf blight is a common disease of sunflower, which mainly threatens its leaf edge, leaf tip and other places. At the time of the disease, there will be many irregular disease spots on the leaves, and will gradually spread with the passage of time, and finally lead to the phenomenon of plant death.

Control method: when we deal with the disease of leaf blight, we can use 1000 times of topiramate to spray the plant, usually once every 10 days, and can be cured after 1-2 times.

Control methods of main diseases and insect pests of sunflower

Leaf spot disease, powdery mildew and shell insects are common.

The disease was sprayed with 1000 times of 50% Dysen zinc wettable powder.

The shell worm was sprayed with 1000 times of omethoate EC.