Prevention and treatment of black spot and powdery mildew, the number one killer of rose

This is the 838th day of the Blue Monster Daily Original Article.

This article is one of the original theories of blue demon

Excerpts from the series of articles on "Three-step Method of Rose Culture"

Yesterday's article introduced the blue demon rose stem bee, in fact, this season, in addition to the high incidence of rose stem bee, rose two major diseases are also in the bud, that is, black spot disease and powdery mildew.

Black spot and powdery mildew are extremely harmful to roses, and the incidence is extremely high, especially in spring, when the air humidity is high and the temperature is high, black spot and powdery mildew of roses are easy to break out.

Today, the blue demon will talk about the prevention and treatment of rose black spot and powdery mildew. What is black spot?

Rose black spot disease is caused by fungal infection, rose leaves, petioles, leaf tips, young branches and pedicels appear black spots disease. The main damage rose leaves, resulting in black spots, yellow leaves until falling off. Characteristics of black spot disease:

Black spot disease mainly occurs in higher temperature, more rain, high incidence in June to September, spring rain is also easy to occur. Rose leaves infected with black spot will appear black spots, further development of the leaves will turn yellow, and then fall off. If roses infected with black spot disease, left unchecked, the leaves will soon fall off. Black spot disease control measures:

The control of black spot disease is relatively simple, can be prevented with zinc, if you do not want to use drug prevention, you can use the method of mulching to prevent black spot disease spores.

If rose infected with black spot disease should take timely measures, remove infected leaves, and with thiophanate methyl, mancozeb and other fungicides for spraying treatment. Do not let it go, let it develop, rose leaves will all fall off, and finally it is likely to die. What is powdery mildew?

Powdery mildew, like black spot, is a fungal disease. Rose infected with powdery mildew, will lead to rose leaves, tender slightly, flower buds and so on appear white powder. Severe yellow leaves, falling off, affecting the normal growth of roses, resulting in bud withered. Characteristics of powdery mildew:

Powdery mildew occurs well in April-June and September-October, with high air humidity. At the beginning of the disease, the edges of the leaves of rose are curled, white powder can be seen on the back, and then gradually spread to the stems and buds, which can be seen covered with a layer of white powder. Powdery mildew control measures:

The occurrence of powdery mildew is mainly due to high air humidity, so keeping the environment ventilated and relatively dry can effectively prevent the occurrence of powdery mildew. When the disease does not occur, zinc can be used for prevention. If it is found that it has been infected with powdery mildew, the infected leaves should be cut off first, and then sprayed with myclobutanil.

Blue demon oneself medication summary thinks stone sulfur mixture to powdery mildew effect is better, it is the taste is a bit big, outdoor culture flower friend, can first stone sulfur mixture treatment. When myclobutanil or kresoxystrobin is used for treatment, zinc or a small amount of soapy water should be added to increase the tonicity of the solution.

Because ordinary chemicals are not easy to adhere to the spores of powdery mildew, the treatment effect will be relatively poor. Adding soapy water can increase the tonicity of the liquid medicine, which is easy to adhere to powdery mildew, and the sterilization effect is better.

In addition to black spot disease and powdery mildew, there are also rose downy mildew is also a high incidence of diseases during the Spring Festival. The characteristics of downy mildew: downy mildew onset, rose leaves will appear smear-like brown spots. At the beginning of the disease, there will be water-like scars, which need attention.

Downy mildew and black spot disease, powdery mildew belong to fungal disease, medicine should also use fungal medicine. If you use drugs to treat bacterial diseases, fungal diseases, the effect is minimal, this must be remembered.

In addition to these three diseases, there are many common diseases of roses. What other diseases do you want to know about roses? May wish to leave a message to the blue demon below, tomorrow's article blue demon will further pay attention to the prevention and treatment of common diseases of rose.

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