After harvesting, the pear fruit often suffers from various diseases due to invasion of bacteria and physiological disorders during storage, resulting in loss and economic loss. The main diseases are the following five species: Penicillium can occur in many fruit products, caused by Penicillium parasitism, especially in the late stage of storage, pears stored in cold storage is also unavoidable. Thick and tough varieties of the skin are more resistant to the disease and occur less frequently. Storage should be disinfected before storage, fruit wrapping, can reduce the spread of the disease and germs. Heart rot This is a physiological disease that results from long-term cold storage, poor ventilation, and the result of hypoxic respiration when the fruit is too mature. The diseased fruit has discolored, corrupted, and undisturbed appearance in its heart, and the disease gradually expands from the inside to the outside. To reduce this disease, attention should be paid to the management during storage. Conditions such as temperature, humidity, and ventilation in the library must be maintained in an appropriate and good condition. In addition to harming the fruit, the pathogen of the ringworm disease can also invade the limbs of pear trees, and can be infected both during growth and during storage. The victim's fruit has lesions on the skin, the lesions are rostral, and the disease develops a foul odor. During the growth period, it is necessary to strengthen management and spray pesticides reasonably. When storing, care should be taken to select fruits without injuries. The anthracnose diseased fruit had brown spots on the fruit surface, followed by an enlarged lesion, slightly moistened, and concave downward. The diseased department has black spores that are sticky and slippery. At the storage temperature of not higher than 3 °C ~ 4 °C, less incidence. Pear fruits with high maturity, especially those with thin skin, are prone to this disease. Black pear disease occurs in this disease pear fruit, born in the fruit surface, ranging in size from black or brown spots, spots with concentric ring pattern. The lesions develop further and the tissues decay, producing white mycelium and near-black spores. Prevention of the disease can use good varieties of disease resistance, storage of pear fruit should be complete and healthy, gently and gently, without damage, maintain a suitable low temperature during storage.
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