Strains are the basic conditions for the production of edible fungi, and their quality directly affects the yield and quality of edible fungi. The preservation of strains is an important factor in ensuring the growth of edible fungi and the income of mushroom farmers. Household refrigerator-preservation strains are the most commonly used, simplest and most economical method for the preservation of strains. It not only has a good effect of inhibiting the growth of strains, but also has the effect of delaying the aging of strains. In production practice, in order to save money and reduce costs, many farmers often store strains directly in household refrigerators rather than in dedicated refrigerators for preservation. Since household refrigerators have long-term foods such as fruits, beverages, meat and eggs, pathogenic microorganisms may take advantage of them. Therefore, special precautions should be taken when using domestic refrigerators to preserve bacteria. To avoid infection during bacterial preservation, it is necessary to understand and understand the causes of bacterial infection. Although the temperature of domestic refrigerators is very low, it is not conducive to the growth and reproduction of medium-high temperature pathogens, but the low-temperature pathogens can still grow and reproduce normally, and a small number of medium-high temperature pathogens have been gradually surviving under the state of 4-6 degrees Celsius in the refrigerator freezer. Adapted to the low-temperature environment, together with the low-temperature type bacteria, became the source of infection of edible mushroom species. At the same time, in the food, beverage, food and other food into the refrigerator at the same time, some pathogenic microorganisms will also invade, if mixed with Pseudomonas Torrans, it is easy to make Pleurotus ostreatus rust, Pleurotus ostreatus The longer the strains are kept in such an environment, the more serious the rust is. In addition, the relative humidity of the freezer in the refrigerator is relatively high, pathogenic microorganisms are very easy to grow and multiply, and the probability of infection of the bacteria species is correspondingly increased. Under normal circumstances, farmer friends can take appropriate skills to prevent bacterial infections. First, use solid paraffin seal preservation strains. Hold the tampon flush with the mouth of the strainer, then light the candle, drop it onto the tampon with a melted candle, seal it, and cool it into the cooler. This will not only insulate the air and water, but also effectively prevent the tampon from infecting due to moisture, and eventually lead to bacterial infection. Second, the use of plastic bags sealed deposit species. The bacteria test tube and strainer bottle are packed in a plastic bag, and then the bag mouth is tightly fastened and stored in a refrigerator. If conditions permit, the air in the bag can be sucked by the vacuum pump to achieve vacuum preservation, so that the preservation effect is better. Third, regular disinfection of the refrigerator. In order to remove the dirt, odor and pathogenic microorganisms in the refrigerator, the refrigerator should be cleaned and disinfected regularly. Wash with a towel with a proper amount of detergent and then wash it with a clean wet towel to remove dirt, odor, and some pathogenic microorganisms. Thoroughly sterilize with negative oxygen ion generator or ultraviolet germicidal lamp. Because the refrigerator is also used for refrigerating fruits, beverages, meat and eggs, etc. at the same time as the preserved bacteria, it must not be used for fumigation and disinfection with formaldehyde, sulfur and other drugs. 4. Put a desiccant in the freezer of the refrigerator to reduce the relative humidity of the refrigerator, reduce or eliminate the growth and reproduction of pathogenic microorganisms, and prevent further damage to the bacterial species by pathogenic microorganisms. HEBEI PINGLE FLOUR MACHINERY GROUP CO., LTD , http://www.plrollermill.com