Wild rose pests and their control methods

When Rosa davurica suffers from anthracnose, the diseased part can be cut off at the early stage of the disease, and if necessary, appropriate soil replacement treatment should be carried out, and the corresponding methyl thiophanate solution should be sprayed for prevention and control. When powdery mildew and black spot occur, air circulation should be strengthened frequently, water and fertilizer management should be controlled, and chlorothalonil solution should be sprayed for control in severe cases.

Rosa davurica 1 anthracnose pests and their control methods

The common disease of Rosa davurica is anthracnose. At the onset, the leaves will gradually dry up and there will be many brown spots on the leaves. Later, the leaves will gradually corrode, causing the plants to wither. In the early stage of the disease, the diseased plants can be cut off, the soil changed, the roots disinfected, and then an appropriate amount of thiophanate methyl solution sprayed.

2. Powdery mildew

Powdery mildew is also one of the common diseases of Rosa davurica, which mainly attacks leaves, petioles and tender shoots. Irregular white powdery spots will appear on leaves, which will gradually cause the leaves to dry up and fall off. Cut off the key parts, pay attention to ventilation, control watering in autumn and winter, reduce the amount of nitrogen fertilizer, and spray the corresponding chlorothalonil solution for prevention and control.

3. Black spot disease

Rosa multiflora is prone to black spot disease in high temperature and high humidity environment. At the onset, many spots will appear on the leaves, which will eventually expand into irregular black patches. You can cut off the diseased leaves at the onset, disinfect the remaining branches and leaves, put the plants in a ventilated place, reduce the number of watering, and spray carbendazim solution every half month, which is also one of the prevention and control methods of pests and diseases in wild roses.

4.scarab

Scarab is one of the common pests in Rosa davurica, which mainly damages roots, leaves and flower buds. Once the disease occurs, it will seriously affect the number of flowers. At the beginning of the disease, indoor air circulation can be strengthened, invasive leaves can be cut off in time, and diluted deltamethrin solution can be sprayed once a month for prevention and control.