What to do if there are red spiders on the Chinese roses
The editor introduces how to deal with red spiders on Chinese roses, and the following is a detailed answer from the editor.
What to do if there are red spiders on Chinese roses, what medicine to use for red spiders on Chinese roses
Recently, in the iAsk Circle, many flower friends have asked about the yellowing leaves of Chinese roses, which is all caused by red spider infestation. It is also the high-incidence period of red spiders. Today, let's talk about the prevention and control methods for red spiders.
Prevention methods for red spiders in spring
Many flower friends feel puzzled, why do I have bugs even though I am raising them on the balcony indoors? In fact, the probability of Chinese roses having diseases and pests is lower than that of ground-raised ones, but this does not mean that they will not occur.
Red spiders, like these insects, prefer high-temperature and dry environments, especially indoor balconies, where poor ventilation, high temperatures, and dryness can easily cause red spider infestations.
Red spiders are not very large, but they are very aggressive, referring to their attacks on Chinese roses. So you don't need to be afraid of them. Although red spiders are small, they are very harmful to Chinese roses and prevention should always be greater than treatment.
Prevention methods:
Preventing red spiders should be combined with environmental factors. If it's an indoor balcony with poor ventilation and no rain, then when watering, try to spray the leaves of the Chinese roses to increase humidity. Red spiders are afraid of water, so maintaining a certain level of humidity is useful for preventing red spiders.
In April, it is necessary to remove some leaves near the potting soil at the bottom and blind buds inside the plant. Removing leaves and blind buds is not only necessary for Chinese roses on indoor balconies but also for those raised outdoors. It is best to remove some dense blind branches and old leaves.
Red spiders and black spot disease often originate from the soil surface, so removing old leaves near the soil is like blocking the path for red spiders and pathogens, which can have a good preventive effect. Attentive flower friends will find that the incidence of black spot disease and red spiders in棒棒糖-shaped tree roses is much lower than that in normal plants, and this is the reason.
So, if your Chinese roses still have many leaves hanging over the potting soil, remove them now, it's not too late.
In addition to watering and removing bottom leaves, it is also important to maintain good ventilation in the environment. For Chinese roses raised on balconies, open windows for ventilation more often, and do not place outdoor roses too closely together. It is best to have some space between pots so that if an individual pot has a red spider infestation, it will not spread to other pots.
You can also regularly spray the plants with a 200x alcohol solution to prevent pest and diseases like black spot disease.
In addition to physical prevention, for flower friends raising roses on indoor balconies and in southern regions, it is best to combine chemical prevention by spraying red spider-killing medicine every 10-15 days, focusing on the potting soil surface and the undersides of leaves.
Methods for controlling red spiders
If Chinese roses have red spiders, they must be treated promptly because red spiders reproduce very quickly. The recommended treatment method is a combination of physical and chemical pesticides.
First, wash the back of the Chinese rose leaves with high-pressure water to remove most of the red spiders. After the leaves have dried, spray with pesticides. You can use Jinmanzhi and Damailing together or rotate between 2-3 miticides, spraying every 5-7 days.
If you don't want to use pesticides in the balcony, you can also try using a laundry detergent and urea method to kill red spiders. Mix laundry detergent, urea, and water in a ratio of 1:3:300, i.e., 1g of laundry detergent, 3g of urea, and 300ml of water, and then spray the solution on the back of the leaves with red spiders, once every 3 days, which also has a good effect.
For outdoor-raised Chinese roses, it is recommended to continue using pesticides for more guaranteed results. If you're lucky or if you're in the southern region during the plum rain season, the outdoor Chinese roses may recover without medication after a season of rain.
The occurrence of diseases and pests in Chinese roses follows a certain pattern. Maintaining healthy growth of Chinese roses and regularly preventing diseases and pests is a very important task. You can refer to the comprehensive disease and pest control methods in the book "How to grow Chinese roses from scratch" for prevention and treatment.
The above introduction on what to do if there are red spiders on Chinese roses and what medicine to use for red spider infestations on Chinese roses is hoped to bring some knowledge of flowers to rose enthusiasts.