Rainy during Qingming time, be cautious of the rose powdery mildew approaching
Article introduction: The explanation of green plants and flowers for the arrival of rose powdery mildew during the Qingming season, next, the site editor will introduce to the netizens.
Rainy during Qingming time, be cautious of the rose powdery mildew!
The continuous rainy weather has just ended, and it will soon enter the restart mode again. In the rainy and humid season, our roses are most likely to be invaded by powdery mildew, and once infected, it is very difficult to treat. So today, let's talk in detail about the prevention and treatment of rose powdery mildew.
Preventive measures for rose powdery mildew
Rose powdery mildew is most likely to occur when the air humidity is high and the day-night temperature difference is large. The pathogen of rose powdery mildew has a strong寄生 ability. The thinner and younger the epidermis of plant organ tissues, the more likely it is to be invaded by the powdery mildew pathogen. Therefore, most of the parts affected by powdery mildew in roses are on the new leaves and the stems under the flower buds.
Prevention is better than cure. When maintaining roses, it is necessary to ensure sufficient sunlight and control the use of nitrogen fertilizer to avoid excessive nitrogen causing the roses to grow excessively and easily invaded by powdery mildew.
At the same time, attention should be paid to maintaining good ventilation in the environment and regularly spraying fungicides for prevention. For example, Mancozeb, Thiophanate-methyl, and Carbendazim, etc., are all good for preventing powdery mildew.
Symptoms of rose powdery mildew
If the importance of prevention is overlooked during maintenance, and the roses develop powdery mildew, it is necessary to treat it promptly in the early stage of infection.
The early symptoms of powdery mildew are similar to those of downy mildew, so it is important to distinguish them. The symptoms of powdery mildew include:
White spots appear on the leaves, infected tender leaves of roses will show curling and twisted phenomena. The leaf surface or flower stems are covered with white powder.
If your roses show any of the above three symptoms, you should immediately check for further confirmation.
Treatment methods for rose powdery mildew
The treatment of powdery mildew is relatively difficult because the pathogen multiplies rapidly, and it can mature and reproduce again in 7 days, so the application of pesticides needs to be persistent, and attention should also be paid to resistance issues.
Treatment can use: Myclobutanil, Prochloraz, or also use Pyraclostrobin, Picoxystrobin, etc., which all have good therapeutic effects on powdery mildew. It is recommended to use 2-3 types of medicines alternately. Apply once every 5-7 days.
If one type of medicine is used for a long time, resistance can easily occur. It can also be replaced with lime sulfur solution at a concentration of 1000-1500 times, which has obvious therapeutic effects. However, the efficacy of lime sulfur solution is significantly affected by temperature, so it is recommended to dilute it according to the local temperature to avoid phytotoxicity.
For indoor potted roses on the balcony, if you don't want to use pesticides, you can also spray 200 times the concentration of vinegar or alcohol for prevention. When powdery mildew occurs, you can use a 100 times alcohol solution to wipe the leaves, then spray the medicine, or persistently wipe the leaves with alcohol, which can also cure the disease without using pesticides. Actually, vinegar and alcohol both have good antibacterial effects and are very useful for prevention.悄悄告诉你, Fuyanjie is also very effective against powdery mildew. For severe parts, apply Fuyanjie undiluted, and for other parts, you can spray a solution diluted 100-150 times.
The above sharing of all the content about "rainy during Qingming time, be cautious of the rose powdery mildew approaching", have green plant enthusiasts understood?