Causes and countermeasures of apricot rotten fruit in greenhouse

First, the cause of rotten fruit 1. There is not enough light in the shed. When it is cloudy for a long time or rain or snow, the surface of the shed film is dusty, resulting in insufficient light in the greenhouse and excessive humidity. Young fruit grows in the dark and humid air for a long time, which is easy to cause rotten fruit. 2. The temperature in the shed is too high. In the apricot fruit period, if the temperature in the greenhouse exceeds 28 °C, the water droplets on the shed film will drip directly on the surface of the young fruit, causing rotten fruit. 3. The protection of the drug is not timely, resulting in rotten fruit. Because people mistakenly believe that the apricot tree is cultivated under the conditions of the shed, there is no pathogen such as wind and rain, insects, etc., and it will not cause disease, so it does not spray or spray less fungicide, causing the apricot sputum to breed, leading to rotten fruit. 4. There are attachments on the surface of young fruit. Due to the poor ventilation conditions in the greenhouse, the humidity is too large. After the apricot flower is thanked, many petals do not fall, but directly adhere to the surface of the young fruit. As the young fruit grows and develops, these petals are wet and absorb water, and the parts in contact with the petals are long. In a mildew state, the fruit rots. 5. Golden sun apricot and other varieties, self-flowering strength, easy to form string flower branches, with the growth and development of young fruit, the fruit grows, the fruit and fruit are crowded together, when the temperature and humidity are suitable for the infection of the scab, causing rotten fruit. Second, the prevention measures for the phenomenon of apricot rotten fruit in the greenhouse, after repeated practice, that the following countermeasures should be taken: Improve lighting conditions and adjust temperature and humidity. Use high-quality non-drip film, if it is old shed film, it should remove the dust on the surface of the shed film in time to increase the transmittance; on cloudy or rainy days, it is best to install fluorescent lamps in the shed, supplement the light and increase the temperature of the shed; As far as possible, the shape of the spindle is light-transparent; the weather should be timely and ventilated, and the temperature of the chamber should be below 28 °C, and the relative humidity should be about 60%. 2. Spray in time. Spray according to the different phenological periods of apricot trees. Spray 5 wave of Meteorite sulphur mixture before germination, spray 70% methyl thiophanate 1000 times solution after Xiehua, spray 80% carbendazim 600-800 times liquid during fruit expansion period, spray 65% ​​mancozeb in fast-growing period of new shoots Zinc 1000 times solution. 3. Remove the fruit surface attachments after flowering to keep the fruit surface clean. After the flower is given, the petals that have not fallen off are removed in time, and the leaves covering the apricot fruit are removed to prevent the fruit from being attached to the fruit. 4. Remove the diseased fruit in time and concentrate on it. 5. Thinning, thinning, reasonable load. For varieties with strong knot strength, when flowering and fruiting is long, it should be sparse and thin, and it is generally appropriate to not touch when the fruit is ripe.

(Jin Xueli Cui Jingjun) (Tianjin Wuqing District Forestry Science and Technology Promotion Center)

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