Red Fuji apple tree apple bag why rotten fruit

There are two reasons for this: First, after spraying the fungicide and calcium fertilizer before bagging, it takes two days of sunlight to allow the fruit to be fully absorbed as much as possible, and then select the sunny day at 8:00 am after the fruit surface is not dew. . Some fruit growers have failed to meet operating standards due to eager bagging or work-related tasks, resulting in insufficient calcium absorption, dew when bagging, and rot;

Second, the individual fruit temperature before bagging is low. After bagging, the temperature of the microclimate changes, the temperature inside the bag increases, the humidity on the fruit surface increases, and even the fog appears. This temperature and humidity condition is suitable for the invasion of the spores of the pathogen, and then lurks until the fruit is about to mature. At that time, it showed signs of rot.

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