Rose AnthracnosesymptomWhen roses are infected with anthracnose, semicircular spots will appear on the edges of the leaves, and many small black spots will appear on the spots in the later stages. When the environment is humid and the plants are too dense, the disease is likely to occur. Anthracnose usually occurs sporadically, spreading from one leaf to the entire plant. Prevention and treatment methodsIn autumn and winter, clean the plants in time, cut off the fallen leaves and dead branches, and clean them up. Appropriately thin out branches to increase light transmittance. When the disease occurs, spray the pesticide in time. Daconin, Carbontelene, and Benomyl can all be used. Spray after diluting with water. It is better to use several pesticides alternately. Rose powdery mildewsymptomPowdery mildew mainly harms leaves, petioles, leaf tips and flower buds. Irregular white powdery mildew spots will appear on adult leaves, the leaves will gradually turn brown from the tips, and the leaves will gradually fall off. White powdery spots appear on both sides of young leaves, which eventually cover the entire leaves, turning them into light gray or purple-red. The disease is prone to occur in an environment with overly dense planting, excessive nitrogen fertilizer, poor ventilation, and insufficient sunlight. Prevention and treatment methodsPrune in winter and cut off diseased and insect-infested branches and diseased buds. Appropriate application of phosphorus and potassium fertilizers can enhance the plant's disease resistance. Pay attention to ventilation and light transmission, and ensure that the soil is slightly moist without water accumulation. Once the disease is discovered, spray the pesticide in time. You can choose carbendazim or triadimefon sulfur suspension, spray once a week, 3 to 4 times will be enough. |
<<: Common diseases and pests of Hongfentaige and their control methods
>>: Diseases and Pests of Jade Bell and Their Control
The reason why the leaves of the golden diamond t...
What to do if it doesn't bloom Not yet old Th...
Rhododendron repotting time It is generally best ...
Schefflera is a popular plant in households. Alth...
1. Planting technology 1. Seed germination: When ...
Do roses prefer shade or sun? Rose is a sun-lovin...
Yucca flowering period The flowering period of Yu...
When transplanting Phoenix Bamboo, it is best to ...
1. Different leaves Taro refers to the taro plant...
Runners Chlorophytum is a perennial herb. One of ...
Sunflower growth environment conditions and requi...
1. Covering film If the planting area is relative...
1. Normal maintenance Reason: Although azalea is ...
Green Leaf Jade is very easy to grow. Green Leaf ...
1. Money String A string of money can symbolize g...