1. InfectionCause: The leaves of coleus turn black, which may be caused by gray mold, which can harm the leaves. At first, there will be water-like spots on the leaves, which will gradually expand and turn brown or black, giving a feeling of soft rot and making them easier to identify. Measures: This disease is mainly prevented. Pay more attention to ventilation and promote air circulation. Apply less nitrogen fertilizer during daily maintenance and management. After the disease occurs, remove the rotten leaves in time, and then spray with pesticides such as Shijiale and Botrytis cinerea.2. Strong light burnsReason: Coleus likes sunlight, but cannot withstand strong light. Once exposed to strong light, the tips of the leaves will turn black, seriously affecting its ornamental value. Measures: Cut off the blackened parts, then change the maintenance environment and place it in a cool, diffused light place for maintenance.3. Too much dustReason: If the leaves are not managed for a long time, a lot of dust will accumulate on the leaves, which will affect photosynthesis and may also breed bacteria and cause the leaves to turn black. Measures: Remove the dust in time and wipe it gently with a rag dipped in water.4. Low temperatureReason: It cannot tolerate low temperatures. If the temperature is low, the leaves will turn black. Measures: Keep warm in winter and the temperature should not be lower than 10 degrees Celsius. |
<<: How to deal with the wilting leaves of coleus
>>: Can coleus survive if its leaves are rotten?
1. Suitable soil The soil for planting is very im...
1. Planting time When planting Clivia seeds, try ...
Nutrient requirements You can replenish nutrients...
Soil selection for golden echinops The soil must ...
Basil Directions: Tender basil leaves can be used...
1. Is it suitable? The Amaryllis plant is suitabl...
1. Prepare the land Planting pineapple trees has ...
Verbena is a flower plant that many friends like....
The Ji rose is a very miniature variety of roses,...
Function of Frost Morning: Leaf Viewing The leaf ...
1. Water control Although this plant likes moistu...
The propagation of Rosa lutea by division Rosa ru...
Asparagus fern is evergreen all year round, and h...
Lily is a common household flower. Many flower lo...
When is the best time to divide the pots of Begon...