Cause

The possible main factors leading to the blackening of umbrella leaves are as follows: diseases and insect pests; Improper fertilization; And the planting environment is not suitable for the growth of large leaf umbrella, which mainly includes light conditions, ventilation status and the amount of watering

Solution

Diseases and insect pests

If the leaves of the big leaf umbrella you cultivated turn black first and then rot, it may be caused by bacteria. At this time, it is recommended that you spray some fungicides such as carbendazim on the leaves; If you find that there are obvious small insects on their leaves, you can choose to spray "Black Whirlwind", which will improve after a period of time

Improper fertilization

If the umbrella is not fertilized properly, the phenomenon of "burning leaves" will appear, which is also the main reason for the discoloration of the umbrella leaves. If you apply a small amount of fertilizer each time, but still have black leaves, it may be that the fertilizer is too close to the root of the big leaf umbrella during the fertilization process

Improper growth environment

Big leaf umbrella is a plant that likes sunshine. We must let the big leaf umbrella plant receive sufficient light. But the big leaf umbrella is not resistant to high temperature. We should pay attention to this in high-temperature baking weather such as midsummer. Because big leaf umbrella is generally cultivated as an indoor foliage plant, some friends may ignore the demand for light. If the growth environment is too dark, it will also cause big leaf umbrella to lose its leaves

Precautions

Indoor ventilation conditions are as important as the drainage of the soil selected for cultivation. Keep the environment around the big leaf umbrella relatively dry, and water it when 80% of the basin soil (at least the surface) is dry