What to do with the white spots on Chrysanthemum leaves

There are two reasons for its white spot, one is powdery mildew, the other is white rust. The former treatment is to clear the grass after winter, then water it and apply nitrogen fertilizer. We need to prune it and beat leaves, and spray it with carbendazim three times or so. And white rust is to increase phosphorus and potassium fertilizer, hydrophobic weeds to eliminate, use zincic and other things to spray.

I. powdery mildew

1. Reason

This disease is caused by powdery mildew. In the open cultivation area in the South and in the greenhouse in the north, there is a probability of this disease. Moreover, the disease will occur in the soil for winter, in places with high humidity and low illumination, and in places with poor ventilation and great temperature difference between day and night. If we irrigate it with too much water, or the plants are too densely planted, or the drought occurs, the disease will be more serious. In the initial stage of the disease, there will be more yellow and white spots on the top of the leaves, which are located on the front of the leaves, while other parts of the leaves are also easy to be infected, and may die in serious cases.

2. Measures

First of all, we should clean up the weeds after winter, then water and fertilize them.

Secondly, we need to clean up the branches and leaves, so that all the leaves can receive the light and also be blown by the wind.

Finally, we need to use carbendazim for it. If we use 0.3 and 0.5 lime sulfur mixture, it is also feasible. Generally once in ten days or three times in a row.

2. White rust

1. Reason

This disease is mainly caused by the bacteria living in the soil or on the plants for the winter, which will happen in the next season. It is also spread by artificial field operation. If the flowerpot is placed too close, it can also spread, and the high-pressure water spray will also spread with the water. At the beginning of the disease, there will be small spots on the leaves, which will gradually grow larger later, and then become light yellow brown. If more serious plants will die.

chrysanthemum

2. Measures

First of all, we need to apply fertilizer, phosphorus and potassium fertilizer is to increase, the resistance of this plant to pathogens will be higher

Then we should always drain water and not allow water to accumulate in the basin. To get rid of weeds and sick leaves

In the rainy season, 65% of zineb, or 0.3 to 0.5 of thiol, should be used. The time interval is 10 to 15 days, which can inhibit the spread of the disease. In addition, carbendazim or tolbutine can also be used

Beautiful chrysanthemums.