Rose summer easy to infect the black spot prevention and control skills can be removed without chemicals

If the growth environment of Chinese rose is moist for a long time or there is stagnant water, it is easy to grow black spot disease. When growing Chinese rose, you must regularly control diseases and insect pests and avoid being infected with fungi. As long as you keep the flowers of the same month, they will be able to bloom brilliantly and charming.

If you find that there are several black spots on the leaves of Chinese roses, if you do not deal with these spots in time, they will spread to all the leaves, or even damage the whole plant, the leaves will slowly turn yellow, and then will continue to fall, if not dealt with in time, these small black spots can be fatal to rose flowers.

Black spot is a common fungal disease of Chinese rose. It is a kind of disease and insect pest easily induced when the humidity is good and the temperature is high.

At first, these spots are small black spots, and eventually they turn into irregular black patches. This is when the disease begins to worsen. The leaves infected with these diseases will slowly turn yellow, and eventually they will continue to lose leaves.

If not treated in time, these black spots will spread to the whole plant of the rose, and the affected branches will become black or purple.

Black spot is very easy to deal with, it is not fatal to the rose itself, but the infected rose will become very weak, its growth will slow down, and its resistance to diseases and insect pests will become very low. black spot will not only affect its leaves, but also produce fungal spores, which will continue to drop leaves during the Winter Solstice's night winter, and fungi will spread with water and wind, causing all plants at home to be infected with fungal diseases.

Therefore, when conserving rose flowers, we must avoid excessive moisture in the soil, do not water the leaves too frequently when the temperature is high, do not accumulate water on the leaves, and do not sprinkle them directly on the leaves when watering. Once infected with fungal diseases, the above measures can greatly reduce the risk of black spot infection.

Be sure to avoid watering at night, because it takes about 7 hours for black spot spores to break out, and it's best to water them in the morning, so that the leaves are fully dry before the spores survive. It is easy to catch black spot if it is watered at night or when it rains.

Another thing to pay attention to is not to plant Chinese rose too close, if the plants are overcrowded, it will affect the air circulation.

Another problem is to pay attention to maintaining a ventilated and transparent environment, and good ventilation should be maintained between branches and leaves, and the branches and leaves at the bottom of the roots should be pruned in time, and it is best to choose to prune them after the frost is over. do not overshade the environment, and let the leaves dry quickly after watering to avoid long-term moisture.

Beginners had better choose some varieties with strong resistance to diseases and insect pests, and plants with strong resistance to diseases and insect pests can survive better even if they are infected with black spot. For example, the common David Thompson rose contains the Violet Queen.

Diseased leaves should be removed in time, and fallen leaves on the ground should also be cleared in time. Infected leaves should not be used for composting and put on the soil surface. Throw them into the dustbin or burn them in time.

Common fungicides can be used for the prevention and treatment of black spot, including chlorothalonil, methyl topiramate, Dysen zinc and so on.

After that, it is necessary to spray germicides regularly, usually once every 5-7 days, and about 4 times in a row can be completely removed. The damaged leaves cannot be recovered, so they should be cut off in time to prevent dark spots from spreading.

If you don't want to spray, you can also use the following organic pesticides, such as baking soda and vinegar, which can be mixed with baking soda, mixed with water and sprayed on leaf tips to kill fungal diseases.

Of course, if you want to get better results, you can use one tablespoon of baking soda, mix two tablespoons of vegetable oil, add the first soapy water, add some edible vinegar, mix it in 3-4 liters of water and spray it every 6-7 days. so you can get rid of black spots.

It can also be sprayed with a solution mixed with sulfur powder, which can also effectively remove diseases and insect pests, and can be sprinkled directly on the soil, but be especially careful not to inhale dust and smoke.

Baking soda and oil mixture can also remove black spot, it is characterized by changing the pH value, you can use 4 liters of water, mix a little baking soda, add a little rapeseed oil, mix and spray on the leaves to avoid spraying in the heat and sun, otherwise the leaves will be burned.

If you are more extravagant, you can mix one part of milk and two parts of water and spray it once a week to get rid of black spot.

Of course, the more effective is to use neem oil, it is made from the juice of neem tree, effective organic fungicide, can be bought in many horticultural shops, it can stop the spores of black spot disease.