Under what circumstances should pears be covered with yellow-outer-black-inner pear protection bags?

Bagging can not only effectively prevent direct damage to pears by pests and diseases and reduce the use of pesticides, but also improve the appearance quality of the fruit, making the fruit surface smoother and the color more uniform, thereby improving the commodity value and market competitiveness of the fruit. The yellow-outer-black-inner pear protection bag, due to its unique double-layer structure design, not only ensures sufficient light for the fruit, but also effectively blocks direct ultraviolet rays and prevents the occurrence of sunburn.

The choice of bagging time is a key link in bagging technology, which is directly related to the effectiveness of bagging and the quality of the fruit. The bagging time for pear trees should be selected 20-25 days after flowering. The reason why this time period is critical is that at this time the young fruit has been firmly seated and is not easy to fall off, and the fruit has not yet begun to expand rapidly. After bagging, it can grow stably in the protective bag and will not be affected by the restraint of the bag. Its normal development. If the bagging is too early, the fruit has not yet settled firmly, and the fruit is likely to fall off after bagging; if the bagging is too late, the fruit has begun to expand rapidly, and the fruit is easily damaged during bagging, and it is impossible to effectively prevent the invasion of pests and diseases, affecting the quality of the fruit.

The choice of the timing of bagging needs to take weather factors into consideration. Sunny days are the best weather conditions for bagging operations. 8:30 to 11:30 in the morning or 2:30 to 6:00 in the afternoon on sunny days is the best time for bagging. This is because during this period of time, the sunlight is moderate and the temperature is suitable. The temperature in the protective bag will not be too high due to high temperature, causing heat damage to the fruit; nor will the humidity in the bag be too high due to the influence of rain or dew, causing the fruit to mold or rot. Therefore, when carrying out bagging operations, fruit farmers should pay close attention to weather forecasts and choose sunny days for bagging to ensure the bagging effect.

Pears that can be bagged should have the following characteristics:

The fruit should be healthy and free of pests and diseases. This is the basic premise of bagging. If the fruit itself is already infected with pests and diseases, bagging will not effectively prevent the spread and spread of pests and diseases, but may aggravate the degree of the disease. Before bagging, fruit farmers should carefully check the fruit, remove the diseased and worm-infested fruit in time, and ensure that the bagged fruit is healthy.

The size and shape of the fruit should be relatively uniform. This is because after bagging, the fruit will grow in the protective bag for a period of time. If the size and shape of the fruit are too different, the appearance quality of the fruit may be affected after bagging. When choosing bagged fruits, fruit farmers should try to choose fruits with relatively uniform size and shape for bagging.

The fruit setting position should be relatively stable. This is because after bagging, the fruit will be bound by the protective bag. If the fruit setting position is not stable, it will be easily affected by wind and rain, causing the bag to fall off or break, affecting the bagging effect. Therefore, when bagging, fruit farmers should try to choose fruits with stable fruit setting positions for bagging.