What disease has my rose (monthly rose) got and how should I treat it?

This episode is part of the "1000 Questions on Growing Flowers" series, the Gardening Lecture Hall. We welcome your questions! For all the questions you leave for me in the comments, we will answer them as quickly as possible.

Hello everyone, after much preparation, the Gardening Lecture Hall officially meets you today. Later we will have articles with pictures and videos to teach you about growing flowers. This is the first episode, and we welcome your questions!

Q: Why does my newly bought rose have yellow leaves?

A: There are many kinds of yellow leaves. The common ones are as follows:

Natural yellowing

Because the environment is briefly unsuitable, it causes stress-induced yellow leaves. This is a minor problem, so do not make a fuss about it.

Yellow leaves from overwatering

This is a typical damage-related yellowing. The principle is: the soil lacks oxygen, which damages the root system, causing a lack of nutrients and thus yellow leaves. In serious cases it can lead to the death of the plant.

Pathological yellow leaves

Caused by fungal diseases, such as leaf spot and black spot. They are highly contagious, and if not treated in time, the plant is done for.

Q: How do you deal with a rose that has natural yellow leaves?

A: Clean up the fallen leaves in the flowerpot; yellow leaves on the branches can also be cleaned up. Then pay attention to acclimatising the seedling and providing shade. To be safe, you can spray a carbendazim solution once.

Q: What should be done about yellow leaves caused by overwatering?

A: This depends on the severity. A mild case is when yellow leaves have just appeared. At this point we just need to control the watering, and basically there is no problem. But if the whole plant has yellow leaves, then the root system has probably completely rotted, and trying to save it is a fool's errand. If there are only minor root problems, you can use a root-promoting nutrient solution to condition it, and the effect is quite good.

Q: For pathological yellow leaves, black spot and leaf spot, what medicine should be used?

A: This must be discovered early, the earlier the better. Traditional treatment: dilute carbendazim 1000 times and spray. But it can only provide a certain preventive effect. If you want good results, you can use pesticides such as azoxystrobin, difenoconazole and triadimefon copper. Dilute 1000 times and spray on the leaves, with an interval of 5~7 days between sprays, and use it 2~3 times in a row.

That is generally all there is to yellow leaves on roses. Secondly, everyone should pay more attention to ventilation, otherwise roses easily turn yellow from being "stuffy". In early autumn many people like to grow roses, so let me also give you some advice.

(1) Put some effort into choosing the seedlings

Do not buy carelessly, and do not be greedy for cheap prices. Good ones will not be too cheap, and the cheap ones are all bad. Do not keep asking for free shipping; good seedlings basically do not come with free shipping now. For choosing roses, I recommend Wuyan's; we have cooperated for a long time, and the results are still decent.

(2) Do not be careless about choosing soil

Do not be careless about what soil you choose. If you are going to grow them, then grow them well for me. People who are greedy for cheap prices always end up with the highest costs. For beginners, do not use garden soil alone; you can add some good nutrient soil and mix it in. Only with good aeration will the root system grow well. That is how roses are more likely to grow well and easily bloom in a full pot!

Alright, that is all for this episode's Q&A. If you find it useful, please give me a like. If you have any questions, please leave a comment directly. Maybe your question will be adopted by me!