What are the control methods for common pests and diseases of Rosa laevigata?
Rosa laevigata is a common wild plant. Due to the development of its medicinal properties, market demand for it has risen sharply, and many people have begun growing it at home. As a wild plant, it has strong vitality and rarely suffers from pests and diseases, but when cultivated artificially it is often harmed by pests and diseases, which damage its growth and yield. Below, let's take a look at the introduction to the control methods for common pests and diseases of Rosa laevigata.
1. Powdery mildew
Petioles, leaves, young shoots and flower buds can all be affected. When mature leaves are affected, irregular powdery white lesions appear on the leaves; the diseased leaves gradually turn brown starting at night, eventually causing the leaves to dry up and fall off. When young leaves are affected, chlorotic lesions appear and gradually spread, producing white powdery spots that later cover the entire leaf.
Control methods: Choose varieties with strong disease resistance, pay attention to pruning in winter, cut off diseased and pest-infested branches, strengthen field management, increase the application of phosphorus and potassium fertilizers, and improve the plant's disease resistance. When the disease occurs, spray carbendazim; in early spring before budding, spray lime sulfur for control.
2. Black spot
This disease mainly affects leaves, petioles and young shoots. When leaves are affected, small purplish-brown spots appear, gradually expanding into round or irregular black lesions, causing the leaves to wither.
Control methods: Pay attention to field humidity, drain water after the rainy season, prune dense branches to increase air permeability, and when the disease occurs, spray carbendazim, thiophanate-methyl, daconil and other chemicals for control.
3. Anthracnose
It mainly affects petioles or young shoot parts. When leaves are affected, lesions appear at the leaf margins and gradually spread toward the center; in the later stage, small black grains appear on the lesions. Its pathogen overwinters on fallen leaves and germinates in warm, humid environments. Plants with poor air permeability are prone to the disease.
Control methods: Thoroughly clean the garden in autumn, collect fallen leaves and residual branches and burn them in a centralized manner, prune appropriately to maintain good ventilation and light transmission, and spray thiodiazole-copper or chlorothalonil for prevention.
4. Scarab beetles
They mainly harm the roots, leaves, flower buds and other parts of the plant. During outbreaks, they seriously affect the number of flowers the plant produces and reduce the seed-setting rate, thereby affecting yield.
Control methods: Physical control methods such as light trapping and manual capture can be used. When the pest infestation is severe, spraying deltamethrin or phoxim branches works well.
The above is an introduction to the control methods for common pests and diseases of Rosa laevigata. We hope it can help you. To learn more related knowledge, please stay tuned to us.