The full bloom of apples here is in the late April, and there was rain on the 22nd, 23rd, 24th and 27th of last April, which had a great impact on the pollination of apples in many orchards here. First of all, most orchards here mainly rely on wallbees for pollination. During the rainfall, wallbees basically don&;t come out to move. Apples belong to insect-borne flowers, and it is difficult to complete pollination without insects or artificial pollination. Then, when the pollen is wet by rain, its activity decreases and its spreading ability decreases. The stigma of apple flowers has certain mucus. When the pollen falls on it, it can stick to the pollen. When it rains, these mucus will decrease, and even if there is pollen falling on it, it is difficult to be stuck to complete pollination. So last year, many orchards in Jiaodong area had some problems, such as unable to sit fruit, many fruit drops after sitting fruit, incomplete seed development and fruit type deviation in the later stage. Second, what measures should be taken to improve the quality of apple pollination when it rains during flowering? The most effective way is artificial pollination. Now, some people are recommending the use of growth regulators, which can improve the stress resistance of apples and improve the quality of apple pollination. However, we should know that the basis of apple pollination is that pollen falls on the stigma, and it is useless to use any fertilizer and regulator without pollen falling on the stigma. Therefore, it is suggested that artificial pollination should be carried out as soon as possible after the rain. You can collect pollen from the pollination tree in the orchard and give the central flowers in the orchard. This is completely in time now. If there is not enough pollen on the pollination tree, you can also buy some ready-made pollen. What diseases should be paid attention to when apples are exposed to rain during flowering period? The most common diseases are mildew heart disease and black spot disease in apple during flowering period. The germs of mildew heart disease and black spot disease are actually a kind of germs. After these germs spread through the wind and rain, they invade the ventricle of apples before they sit on the fruit, which will cause the occurrence of mildew heart disease in the later period. If the fruit has been seated, these germs are difficult to invade the ventricle in the later period, and the conditions are suitable. In addition to mold heart disease and black spot disease, it is now in the middle of April. At this time, rainfall is an important period for the spread of rust. If there are juniper trees around the orchard, the spores of rust will spread to the orchard with the wind and rain, causing the occurrence and spread of rust in the orchard. Second, what measures should be taken to deal with the occurrence of diseases when the apple is raining during flowering? Now some people say that it is necessary to apply pesticides as soon as possible after the rain during flowering. I don&;t think it is necessary, and we don&;t need to apply pesticides after it rains deliberately. In that case, the cost will be increased, and the frequent use of pesticides will do more harm than good, which is not only unsafe but also not conducive to the prevention and treatment of diseases. My personal suggestion is to take measures after the first application of medicine, and wait until about 80% of the apples have fallen, that is, when most of the flowers have fallen, to apply medicine. polyoxin has a good effect and safety on the pathogens of mold heart disease and black spot disease. Triazole fungicides are the most effective methods to control apple rust. Personally, I think the effect is better.In case of rain at flowering stage, appropriate triazole fungicides can be added for the first time after flowering, and more attention should be paid to the occurrence of diseases at later stage, and timely measures should be taken if diseased spots appear in the orchard. It is concluded that the rain in apple flowering period has a great influence on the pollination of apple trees, and at the same time, we should pay attention to the prevention and control of diseases. Personally, I think it is enough to take prevention and control measures according to the actual situation of orchard, and the rain in flowering period has little influence on pests.