Causes and countermeasures of rotten apricot fruit in greenhouse

The reason for fruit rot is lack of light in the greenhouse for a long time in cloudy or rainy or snowy days, and there is a lot of dust on the surface of the greenhouse film, resulting in insufficient light and excessive humidity in the greenhouse. Young fruit grows in dark and moist air for a long time, which is easy to cause rotten fruit. The indoor temperature is too high in the young apricot fruit stage, if the temperature in the greenhouse exceeds 28 degrees Celsius, the water droplets of the greenhouse film will drop directly on the surface of the young fruit, causing rotten fruit. The protection is not timely, resulting in rotten fruit because people mistakenly believe that apricot trees are cultivated in the greenhouse without wind, rain, insects and other transmitted bacteria, so they do not spray fungicides or spray less fungicides, resulting in apricot sores and bacteria, resulting in rotten fruit. There are attachments on the young fruit surface due to poor ventilation and excessive humidity in the greenhouse, many petals do not wither and fall, but are directly attached to the young fruit surface. With the growth and development of the young fruit, these petals absorb water when they are wet, and the parts that come into contact with the petals are moldy and wet for a long time, causing the fruit to rot. Preventive measures aiming at the phenomenon of rotten apricot in greenhouse, the following countermeasures are put forward for fruit growers' reference. To improve the lighting conditions, adjust and control the temperature and humidity, select the high-quality non-dripping film, if the old greenhouse film is used, remove the dust on the surface of the greenhouse film in time and increase the light transmittance; in cloudy or rainy or snowy days, it is best to install fluorescent lamps in the greenhouse to supplement the light and increase the shed temperature; try to choose the spindle shape with good light transmission on the tree shape. On sunny days, pay attention to timely ventilation, keep the temperature of the shed below 28 degrees Celsius, and the relative humidity is about 60%. Timely spray protection according to different growth periods of apricot trees. Spray 5 Baume stone sulfur mixture before sprouting; spray 70% methyl topiramate 1000 times after flowering; spray 80% carbendazim 600 times 800 times during fruit expansion; spray 65% mancozeb 1000 times during fast-growing period. After flowering, remove the attachment on the fruit surface in time, keep the fruit surface clean and thank the flower, remove the unwithered petals and remove the leaves that cover the apricot fruit to prevent the attachment of the fruit surface from causing rotten fruit. Timely removal of diseased fruit, focus on flower thinning, fruit thinning, reasonable load. For varieties with strong fruiting strength, when blooming and setting fruit for a long time, it should be thinning flowers and fruits, and it is generally appropriate not to touch each other when the fruit is ripe.