Oryza sativa L. is a kind of parasitic weed which is seriously harmful to sunflower. The parasitism rate of plants is 72% ~ 91%. When the sunflower roots are parasitic, the plants are short, the diameter of the disk is small, the seeds are shriveled, the yield is low and the oil content is reduced. When the damage is serious, the disk cannot be formed, and finally the whole plant withers. Longan is a parasitic plant. When parasitic on the roots of sunflower, it begins to absorb a lot of nutrients and secrete irritating secretions, which are adsorbed on the roots.

Sunflowers are unevenly excavated and bloom indefinitely due to their adsorption in roots. Some don't even blossom and bear fruit until they dry up and die. Sunflower is very tenacious, and its adsorption on the root system will be deepened in the growth and development stage. The lateral roots parasitize the most at a distance of 5 ~ 1 cm, and suffer the most in this part. Strictly implement the quarantine system to prevent seed propagation and diffusion.

cover the stubble with the flower stem fragments of the diseased plant infected with Fusarium wilt or the diseased plant rotted by European Bacillus, and then bury it with soil to cover all the stubble. The thickness of covering soil is more than 2-4cm to prevent the infection and spread of fungi. When the diameter of the disk is more than 1cm, a large amount of 2,4-D water or 2,4-D butyl ester is sprayed on the soil surface or violet plants. Spraying 45-525 kilograms of liquid per hectare. Be careful not to spray too early. If the disk is less than 1 cm, it is easy to cause pesticide damage.

Sunflower seeds contain about 5% fat, mainly unsaturated fat, without cholesterol. The content of linoleic acid is very high, which is helpful to reduce the blood cholesterol level of human body and protect cardiovascular health. Sunflower seeds are also rich in trace elements such as iron, zinc, potassium and magnesium, which can prevent anemia and other diseases. Sunflower seeds are also a good source of vitamin B and vitamin E, which is beneficial to calm mood, prevent cell aging and prevent adult diseases. It has the effects of treating insomnia and enhancing memory, and has certain preventive effects on cancer, hypertension and neurasthenia.