How to prevent insect pests! Diseases and control methods of sunflower

Isn't it a scale worm? Rotten roots may have to be replaced with new soil. Scale insects are prevented by mixing liquor with water in a ratio of 1:

2 。When treating insects, water the surface layer of the potting soil thoroughly. Scale insects begin to move at room temperature 7 in spring.

It can be poured once in April, and then every half a month or so, and it is effective for 4 consecutive times. Use 50 ml of vinegar (rice vinegar), soak a small cotton ball in vinegar, and gently rub it on the stems and leaves of the affected flowers and trees with a wet cotton ball to wipe off and kill the scale insects. This method is convenient and safe, which can not only achieve the purpose of insect control, but also make the damaged leaves green and shiny again.

Gently and repeatedly rubbing the diseased plant with alcohol can remove the scale insects, and it can be removed very cleanly and thoroughly. If you wipe the orchid leaves with alcohol, not only can you get rid of the scale insects, but also the larvae that are not clear to the naked eye, and they are completely killed. With diesel, laundry detergent, water press :

The proportion of 6 is adjusted into the mother liquor, at this time the mother liquor contains 60%, which is milk-like, and after diluting the 30% oil solution with water, carefully spray the scale insects on Milan, kumquat, and cycads. After one week, most of the scale insects changed from fresh orange to shriveled state, indicating that this method has a good control effect on scale insects. Seems to be more effective in the fourth method!

Iodine can also wipe rotten wounds, which is very difficult to effective. You see if it's a worm or a beetle.

Symptoms Leaf blight is a common disease caused by fungal infection, which has a great impact on the growth of sunflower, which can dry up the leaves and cause the death of the whole plant. Leaf blight first infects leaf tips and leaf margins, and the infected places appear brown spots or strip-like plaques in the early stage of the disease, and the spots or patches gradually expand and connect with each other in the middle stage, and the leaves appear gray-white and dry in the later stage.

Solution: Strengthen maintenance, ensure good ventilation, and control air humidity.

When the disease occurs, it can be sprayed with 70% methyl tobuzine 800 solution or 75% chlorothalonil 1000 times solution, sprayed once every 7 10 days, and sprayed 3 to 4 times continuously, which can effectively control the disease.

Symptoms Anthracnose occurs in sunflower and spreads from the leaf margins and tips. The leaves appear round or oval-shaped yellow-brown lesions with slightly raised areas and yellowish edges. As the disease worsens, the lesions will turn black in the later stages, and there will be dense small black spots.

Solution: Strengthen water and fertilizer management to enhance plant disease resistance.

From the early stage of the disease, it can be sprayed with 800 times of 50% thiophanate-methyl wettable powder and 800 times of 75% chlorothalonil wettable powder.

Symptoms Leaf spot and leaf blight equally damage leaves, but the symptoms are different. At the onset of leaf spot, yellow-brown dots appear in the initial stage of leaf disease, which gradually expand into streaks and can merge into irregular necrotic blocks. Leaf tips and leaf margins are the most susceptible, and when the disease is severe, more than half of most leaves are dried up and curled, such as being burned by fire.

The center of the lesion is dark or grayish-white, surrounded by dark lines around the edge, and small oval black spots are scattered in the later part of the lesion.

Solution At the initial stage of the disease, spraying 300 500 times of 50% Kefudan wettable powder, or 400 650 times of 70% mancozeb wettable powder, once a week, several times in a row, can effectively prevent and treat this disease.

This kind of flower is still relatively easy to raise, especially note that it does not like too strong light, so it needs to be shaded in the summer when the light is strong.

It is recommended to maintain it indoors. Water once every half a month, and water thoroughly each time.

We have to fertilize him regularly, every half a month or once a month, and then water it every two or three days to ensure that the soil is moist and breathable, and it should be placed in a place with a better temperature.

It is not difficult to maintain the scattered tail sunflower, do a few "small actions", the four seasons are green, and the new sprouts are rising.