How to treat rose with gray mold? I have a way.

Botrytis cinerea is a common disease of rose, which is characterized by rapid onset and rapid transmission. Botrytis cinerea should be dealt with immediately after it is found, otherwise it is easy to infect a large area.

First of all, if you want to be treated, you have to prescribe the right medicine to the case, so what kind of symptoms will the rose get gray mold? In fact, Botrytis cinerea is just as the name implies, that is, when the disease occurs, there will be a layer of gray and white things, which is a bit like the moldy appearance of our food. At this time, it can be concluded that he was infected with gray mold.

Then the leaves are dark brown, as if scorched by the sun, and the leaves fall off as soon as they are touched, and the leaves are dark brown. What is more serious is that the middle and lower part of the branch becomes grayish brown, and there is a layer of hair on it, while the leaves of the whole branch turn dark brown, long hair or fall off to varying degrees.

Buds are often the main part of Botrytis cinerea, and at first you will find that the outermost petals are a bit like sunburn, which is a mild symptom. Then you will find that the flowers do not thank, but show a state of shrugging down. If you take a closer look, you can find that the petals are covered with a layer of gray-white hair, and the pedicels will turn grayish brown. If the germs continue to develop, the flowers will be dry and withered.

One condition for the onset of Botrytis cinerea is low temperature, especially when the temperature is below 10 degrees Celsius, the bacteria are very easy to spread; the second condition is moist, that is, when the air humidity is too high. Therefore, if the water is watered in cold weather, and the water is not easy to evaporate, it is easy to catch the disease. Of course, the incidence is also high when the air humidity is high in other seasons.

The measure to prevent Botrytis cinerea is to put the potted plants in a ventilated sunny place as far as possible. Sufficient sunshine is conducive to the evaporation of water. Another is the proper pruning of branches and leaves, too dense branches and leaves are not conducive to ventilation, but also contribute to the growth of bacteria, it is easy to "cover" the water vapor inside.

Although Botrytis cinerea spreads quickly, it is easier to treat. The most commonly used drug to treat gray mold is Pythium (the name of this medicine has the word "mold", which is easy to remember. ) to mix the concentration according to the instructions on the drug package (back). As long as the liquid is sprayed on the mildew site, the bacteria can be killed quickly and can be used 3-4 times depending on the condition.