Areca nut yellowing is an important disease of betel nut, what are the symptoms of areca nut yellowi

As the first of the four major medicinal materials in the south, betel nut has been cultivated in China for more than 2,000 years. Areca nut is the main cash crop in Hainan Province, with the largest planting area and the highest output value, with a planting area of 1.5 million mu. In recent years, the yellowing of betel nut has become increasingly serious.

Areca longline virus yellowing is an important disease newly discovered in betel nut production. In the early stage of the disease, it mainly causes yellowing of the middle and lower leaves of the betel nut crown.

In the later stage, yellowing symptoms extend to young and upper leaves. When the disease is severe, the new leaves cannot be normal, the crown width is significantly reduced, and it shrinks into a bundle of tops, and loses the ability to set seeds. The entire crown was yellowed and even died on the top of the wither.

Long-line viruses are usually transmitted by mealybugs, whiteflies or aphids, which are very common in betel nut orchards. The virus has also been found in whiteybugs and whiteflies collected from hospital gardens.

In view of the characteristics of the wide distribution, large occurrence area and serious harm of betel nut longline virus yellow disease, the expert group reminded the relevant departments of the betel nut producing areas and the majority of betel nut growers to take comprehensive control measures to control the spread of the disease in a timely manner. Areca nut is an evergreen tree plant in the palm family. Areca nut mature seeds are mainly produced in Hainan Island, Fujian, Yunnan, Guangxi, Taiwan and other places.

In late spring and early autumn, ripe fruits are harvested and cooked, dried, peeled, removed, dried, soaked, sliced or mashed. The betel nut has a bitter taste and a warm nature, mainly belonging to the stomach meridian and the large intestine meridian. Betel nut has the effect of repelling insects and eliminating accumulation, benefiting qi and water.

Areca nut can be used for a variety of intestinal parasitic diseases, such as tapeworms, hookworms, roundworms, pinworms, ginger worms, etc. Betel nut is warm and bitter. It has the effects of insecticide, destabilizing, diluting water and reducing gas.

It is used to expel parasites such as tapeworms and gingerbread in the body. It can also be used for edema, beriberi, diarrhea and other diseases. Areca nut is rich in arecaine, which is highly carcinogenic.

Betel nut has the functions of expectorant and cough, food and sobering, wide chest and antiemetic, insect repellent, etc., and also has the functions of dispelling dampness and cold, diuretic and regulating qi, and relieving fatigue. Eating betel nut can improve the level of warning, and the reaction will be more sensitive and calmer. Eating betel nut can increase the heart rate.

It is found that the color of the betel nut is degraded, and the color of the leaves will also be yellow, and there will be some spots on the whole.

First of all, there will be yellowing of the leaves, and there will also be wilting, which will also lead to a decrease in the yield of betel nut, and the branches are very dry, the leaves are also very dry, and there will be some insect pests.

The main symptom is that the leaves will turn yellow, if it is more serious, the leaves will not be normal, and will also lose the ability to bear fruit.

The roots will be black, and the leaves will turn yellow, there will be a lot of spots on the leaves, and the leaves will shrunk or even fall, a large number of plants will die, and the yield will be reduced.

Sterilize insect pests first, supplement the trace of non-vegetarian, and spray the products of the 30% suspension agent willow series of biological pesticides about three times.