Cause of leaf loss

1. Diseases and insect pests

Greenhouse potted plants or large leaf umbrellas with high indoor humidity, high temperature, relatively closed and airtight conditions will cause plant diseases and insect pests. If you find white spots on the leaf surface or the leaves curl up and fall, you should carefully check whether there are some insects. If the leaves of the cultivated umbrella turn black first and then rot, it may be caused by bacteria. At this time, it is recommended to spray some "carbendazim" and other drugs on the leaves; If you find that there are obviously visible small insects on the leaves of the umbrella, you can choose to spray "Black Whirlwind", which will improve after a period of time after the pests are removed

2. The growth environment temperature is too low

Because the origin of parasol is tropical, planting this plant in winter should not only ensure that other growth conditions are suitable, but also keep the surrounding temperature below 15 degrees

3. Improper watering and fertilization

If the big leaf umbrella is not fertilized properly, the phenomenon of "burning leaves" will appear, which is also the main reason for the falling leaves of the big leaf umbrella. If you apply a small amount of fertilizer each time, it may be that the fertilizer is too close to the root of the big leaf umbrella during the fertilization process. In winter, the amount of water and fertilizer should be strictly controlled, and the frequency can be watering once every four days or so. In addition, in order to avoid being too dry in winter, you can drench a very small amount of water on the surface of big leaf umbrella leaves

How to effectively prevent leaf loss

1. Proper watering and fertilization. Reduce the number of watering and fertilization as appropriate in winter and in a suitable growth environment

2. The minimum safe temperature for planting big leaf umbrella in winter is 8 degrees Celsius. Be sure to do a good job in cold prevention. Avoid direct sunlight in summer, and do a good job of shading at noon