Bordeaux Liquid Can Effectively Control the Occurrence of Apple Brown Spot in Rainy Season

In the rainy season, how to effectively control the occurrence of brown spot in apple? Funan County Bureau of Agriculture released information: Bordeaux liquid can effectively control the occurrence of apple brown spot in the rainy season.

According to the national apple industry technology system pest prevention and control room, Professor Li Baohua of Qingdao Agricultural University, prevention and treatment opinion: Apple brown spot disease is a typical rainy season disease, continuous rain is the premise and condition for apple brown spot pandemic, which is caused by brown spot pathogen The biological characteristics are determined. The conidia disc of the brown spot pathogen can continuously produce conidia under high humidity conditions (continuous rain), and the speed of sporulation is very fast. After the first rain washed away the spores, less than 24 hours later, more spores were produced on the conidium plate. Therefore, there was still a large amount of spores infecting the rainfall on the second day. During the continuous rainy season, brown spot germs produced fresh spores every day, and even on the 6th and 7th days, the lesions did not stop sporulation. However, in the rainy season, the control effect of most fungicides is difficult to maintain for such a long time.

Part of the systemic bactericides, such as tebuconazole, flusilazole, etc., have a good therapeutic effect on brown spot pathogens. However, the systemic fungicide is effective only within 5 to 7 days after the infection by the pathogen. Once the disease has manifested itself, even the best agents can hardly control the spread and sporulation of the disease. Therefore, spraying the systemic fungicide needs to be based on accurate forecasting. Protective fungicides, such as mancozeb, various copper preparations, etc., also have an ideal control effect on the infection of brown spot. However, most of the protective sterilization is also difficult to withstand continuous rainfall. In the first day of rainfall, these fungicides can provide a good protection effect, but in the second day of rainfall, the effect is difficult to guarantee, and in the third day of rainfall, the residue on the surface of the leaves It has basically been washed by the rain and lost its protective effect. At this time, the pathogens did not stop producing spores and stopped infestation.

Therefore, in the continuous rainy season, most of the protective fungicides cannot effectively protect the apple leaves from the brown spot pathogen. At this point, Bordeaux fluid is superior to other protective fungicides. Bordeaux's greatest advantage is its ability to resist rain, which protects the leaves from brown spot and other pathogens during successive days of rainfall. Such as the Yantai apple production area in the rainy season of conventional disease prevention measures. In normal years, there are two consecutive rainy days in the Yantai fruit-producing area, which first appeared in the middle and late of June, before and after the wheat harvest, and the second time in the late July and (and) early August. Before the onset of the two rainy seasons, fruit growers must spray Bordeaux mixture. The ratio of Bordeaux mixture used during the rainy season is: copper sulfate: quicklime: water = 1:2 to 3:200 to 240 (weight). The greater the amount of rainfall and the longer the duration, the greater the amount of lime should be used to ensure The adhesiveness of the drug. During the interval between the spraying of Bordeaux mixture, a systemic fungicide was sprayed to control the infested germs. Disable Bordeaux mixture before or during apple bagging in April-May to prevent phytotoxicity.

In order to effectively control the damage of apple brown spot in the rainy season, it is necessary to strengthen the management of the disease in the early stage, and continue to use the drug according to the specific period of the drug, so as not to give the chance of infection to the bacteria. On the other hand, before the rainy season comes, spray Bordeaux Bordeaux. Liquid and other protective bactericides can effectively control the infection of pathogenic bacteria during continuous cloudy rain and prevent the onset of disease.

Goji Polysaccharides is a rare plant polysaccharides containing protein, which have side chains of polysaccharide composed by six carbon sugars (rhamnose, arabinose, xylose, mannose, galactose, glucose) and main chains of protein composed by 18 kinds of amino acids. The glycoproteins with biological activity is a high-strength immune enhancer.

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The polysaccharide is extracted by water after dissolving the residues such as oligosaccharides in water at 90-100 DEG C, the extract is concentrated under reduced pressure, the polysaccharides are precipitated by ethanol, the precipitates are washed with anhydrous ethanol and acetone, and the lycium polysaccharides are dried under vacuum. The crude polysaccharide is purified by passing the Lycium barbarum polysaccharide through a column of DEAE cellulose with different concentrations of NaCl as an eluent, concentrating the eluates with different salt concentrations respectively under reduced pressure, desalting them by dialysis, and then lyophilizing them differently Grape Lycium glycoprotein.

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