Gavel is the only medium for the spread of yellow dragon disease In the field, Citrus grandis is the only vector that causes the disease. As long as there are no rafts in the orchards, even if there are diseased trees, Huanglong disease will not be transmitted. However, most of the current fruit farmers are not fully aware of this problem, or put the prevention and control of common insect pests such as red spiders and scale insects in the first place. At the same time, many of the fruit growers missed the two most important key points in the selection of the timing for the control of rafts: the late autumn shoots, the winter shoots, and the wintering period before the sprouting of the spring shoots. The former is the peak of the wood seedlings, while the latter is Wood lice have the lowest density of insects throughout the year and the best time for spraying control. Before sprouting in the spring shoots, it was originally the best time to control the hibiscus in one year (Experiments have shown that killing a adult hibiscus at this time is equivalent to killing 20-200 adults in the summer and autumn shoots). When the hibiscus is extremely difficult to see, and the number of other pests is also small, so most of the fruit farmers will not pay attention. This will lead to sickly hibiscus feeding and spawning on the spring shoots. Huanglong disease has been spread when it is used to kill citrus shoots on spring shoots. Spectral chemical effects vary Among the various agents for killing wood lice, acetamiprid, buprofezin, avermectin, etc. are relatively common choices. After some of the fruit growers have used the above-mentioned agents, they have shown that the control of wood lice is not effective or even effective. The chance of yellowing in the orchard or the occurrence of Huanglong disease is still very high. Deng Mingxue, director of the Plant Protection Office of the Guangxi Citrus Research Institute, once compared some common wood-fungus pesticides to two-year-old Newhall orange seedlings and five- and seven-year-old Kirixiang green trees. Experiments have shown that organophosphorus pesticides and pyrethroids are The mixture of pesticides has the best control effect on adult hibiscus, especially 22% oxaarone EC (fenpropathrin + triazophos), 26% chlorimurin (fenpropathrin + acetaminophen) ), 51.5% poisonous high-chlorine emulsifiable concentrate, 50% profenofos plus fenpropathrin emulsifiable concentrate 220, 260, 515, 500mg/L control effectiveness are all above 92%. The incidence of yellowing in Shuitian Orchard is higher than that in dry and mountainous areas. It is reported that the incidence of yellowing in the orchards of the paddy fields accounted for 33.33% of the yellowing rate, 37.86% more than 30%; the rate of yellowing in the orchards in the mountains accounted for 61.54%, and only 15.38% in the rate of more than 40%. According to Deng Mingxue, paddy field and flatland orchard are relatively serious, and the key is: First, the average temperature of paddy fields is higher than that of mountains, and the survival rate of winter hibiscuses is high, and winter saplings in mountain orchards are frozen to death. Huanglong disease spreads much slower. . Second, the fertile soil of the paddy field is more fertile and has more organic matter. The citrus trees have been thrown in spring, summer, autumn and winter. The number of shoots is more than one, and the number of young shoots is very high. The hibiscus naturally follows many more. Huanglong disease. The benefits of air-dried onions
Many people mistakenly believe that onions have a strong and strong smell and should be classified as irritating food, and people with respiratory diseases or allergies are best not to eat them. In fact, onions can inhibit the activity of histamine, and histamine is a chemical that can cause asthma allergy symptoms. Eating more onions can reduce the chance of asthma.
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1. Lower blood lipid and lower cholesterol
The sulfur-containing compounds in onions, such as allicin, have a good lipid-lowering effect and can reduce the amount of bad cholesterol in the blood, so eating high-fat steak with onions seems to make sense.
2. Relieve high blood pressure
Onion is one of the few vegetables containing prostaglandin a, which can reduce peripheral vascular resistance and blood viscosity, and relieve hypertension symptoms. For the elderly and postmenopausal women, onion is rich in calcium, which can prevent bone loss, and regular intake can also prevent the occurrence of osteoporosis.
3. Reduce the occurrence of asthma
