Who can help me see what happened to my Milan?

The main reason for the formation is that potted Milan is placed in a sultry environment with no ventilation around it.

Prevention and control methods:

(1) Milan should be placed in a sunny and ventilated place in the summer and autumn growth period, and there should be a certain gap between flower pots to reduce the harm of chaff scale. Once exotic plants are found, they should be removed and isolated in time.

(2) If the scale insects are found, the diseased leaves can be removed from the leaves with less insects, and the leaves with more insects need chemical control. The most suitable time to master spraying is in the incubation period (that is, before the shell is formed), and 40% omethoate emulsion or 50% chlorfenapyr 1000 times solution can be used for spraying. In addition, it can also be washed with clear water and soapy water for 3~5 times to remove scale insects.

You can refer to the management points.

First, the temperature should be appropriate. Milan likes warmth. The higher the temperature, the more fragrant the flowers it produces. Generally speaking, the temperature is above 30℃, and the flowers will be very fragrant when there is plenty of sunshine. On the other hand, in an environment below 30℃, if it is in a shady place with insufficient light, flowers will not smell as fragrant as when the temperature is high. When Milan breeds well, the suitable temperature range is between 20℃ and 35℃, and it can bloom up to 5 times from June to 10.

Second, there should be enough light. Milan should be placed in sunny places all year round. If Milan is placed in a well-lit garden or balcony, and the daily light is more than 8 hours to 12 hours, the leaves of the plants will be dark green, the branches will grow vigorously, the number of flowers will increase, the color will be bright yellow, and the fragrance will be rich. If Milan is placed in a cool and sunny environment, the branches and leaves of plants will grow long and thin in vain, the number of flowers will decrease and the fragrance will be weak.

Third, fertilization should be reasonable. Milan has a strong flowering ability and many flowering times, so it needs to be supplemented with nutrition in time. Milan should pay close attention to supplementing nutrition every time it blooms. Lack of fertilizer is the main reason why Milan only grows leaves without flowering or defoliation. So when the temperature rises, Milan will move outdoors for maintenance. After a week, loosen the soil, apply some dilute nitrogen fertilizer, fertilize it with 10% to 20% decomposed cake or human excrement and urine, and then apply liquid fertilizer every 10 day to promote the growth of its branches and leaves. From June, Milan entered a period of vigorous growth and flowering, until the middle of 10. It is necessary to apply concentrated fertilizer mainly containing phosphate fertilizer every 15 days, or spray 0.3% potassium dihydrogen phosphate solution every 15 to 20 days, so that the flowers will flourish more. It is particularly important to note that the flowering period must be dominated by phosphate fertilizer, otherwise it will only grow leaves and not bloom. During the flowering period from June to 10, if fertilization is insufficient, not only will the flowering times be reduced, but also the flowers will not be fragrant, and the buds that have already appeared will wither and fail to bloom.

Fourth, water should be timely and appropriate. The number of watering in Milan depends on the size of plants, the climate change and the place where they are placed, so as to be timely and appropriate. Apply more phosphorus and potassium fertilizer before flowering, often with sunlight scattering and moderate moisture, and its flowering aroma will be rich. Summer is the peak season for Milan's growth, and the water demand also increases, generally watering once a day. In hot and sunny weather, water it once in the morning and once in the evening. Without water, the leaves will turn yellow or even fall off. In case of shower, pour water into the side basin after rain to prevent root rot.