How to prevent and control pests and diseases of Rosa roxburghii? An introduction to the latest methods
The health-strengthening and health-care effects of Rosa roxburghii have attracted great attention at home and abroad. Its cultivation requirements are not strict, it can adapt to major regions, and its cultivation benefits are good. However, during cultivation, Rosa roxburghii is highly susceptible to pests and diseases, which affects yield, quality, and the interests of growers. So what common pests and diseases does Rosa roxburghii have? And how should they be prevented and controlled? Let's take a look together.
1. Powdery mildew
Powdery mildew mainly harms the young and tender parts of Rosa roxburghii, such as tender shoots and tender leaves, and also causes certain harm to flowers and fruits. Its spores are mainly spread by wind, and the dispersal time is mostly during the day. When the disease occurs, irregular lesions appear on the young and tender parts, and in the later stage white powdery substances appear on the lesions, causing the plant to become stunted and affecting yield.
Prevention and control methods: The prevention and control of powdery mildew should be integrated. First, choose an environment with sufficient light for planting. During planting, strengthen fertilizer and water management to improve the disease resistance of the plant, and increase the air permeability between plants through reasonable pruning. When the disease occurs, sprays such as triadimefon and antimycin can be applied for control, with good results.
2. Brown spot disease
Brown spot disease mainly harms the leaf parts of the plant, with old leaves being affected more severely. The onset time is generally from May to October, among which July to August is the period when the disease is most severe. When the disease occurs, brown lesions appear on the leaves. During drought, the lesions dry up and perforate, while under humid conditions they cause rot. In severe cases, a large number of leaves wither and fall off, affecting the normal photosynthesis of the plant.
Prevention and control methods: Strengthen fertilizer and water management to enhance the disease resistance of the plant. When the disease occurs, mancozeb or carbendazim solution can be sprayed for control, once every half month, for 3-4 consecutive sprays. The control effect can reach more than 85%.
3. Sooty mold
Sooty mold does not directly parasitize the Rosa roxburghii plant. It mainly parasitizes the excrement of aphids and whiteflies, and mainly harms the leaves and branches of the plant. When the disease occurs, small dark brown mold spots appear and gradually spread, forming large black sooty mold-like substances. It is a common disease of Rosa roxburghii.
Prevention and control methods: From the perspective of its pathogens, the key to preventing and controlling this disease is aphids and whiteflies. Omethoate can be used to control aphids and whiteflies, with good results.
4. Oriental fruit moth
The oriental fruit moth is the main boring pest of Rosa roxburghii. It bores into the fruit and harms the young and tender parts. In the early stage, it causes flower and fruit drop, and in the middle stage, black fecal-like substances appear inside the fruit. It seriously affects the yield and quality of Rosa roxburghii.
Prevention and control methods: After harvest, prune diseased and insect-infested branches to reduce pest sources, strengthen orchard management, and also use chemicals mixed with soil to make poisonous soil to kill larvae.
The above are prevention and control methods for pests and diseases of Rosa roxburghii. We hope they can help you. If you want to learn more related knowledge, please stay tuned to us.