What are the control methods for pests and diseases of shepherd's purse?

Shepherd's purse (Capsella bursa-pastoris) is a fairly common wild vegetable. Because it can be stir-fried, used as a filling, or cooked in soup, and has a delicious taste and rich nutrition, it is deeply loved by people and is cultivated throughout the country. However, during the growth of shepherd's purse, various pests and diseases cause damage. Let's take a look at the control methods for shepherd's purse pests and diseases below.

1. Downy mildew

Downy mildew mainly damages the leaves of shepherd's purse, and mostly occurs in plots with high temperature and high humidity and poor drainage. In addition, an environment with poor ventilation can also induce this disease. When the disease occurs, light green lesions appear on the leaves, and a grayish-white mold layer appears on the back of the diseased leaves. Under dry conditions the leaves wither, while under humid conditions the leaves rot.

Control methods: Reasonable crop rotation; it should not be continuously cropped or planted adjacent to cruciferous vegetables. Pay attention to fertilizer and water management, increase plant ventilation, and reduce the chance of disease. When the disease occurs, agents such as ridomil manganese zinc, mancozeb, chlorothalonil, and carbendazim can be sprayed alternately for control.

2. Black spot

Black spot also mainly damages the leaves. When the disease occurs, it generally first appears on the outer leaves, with light brown or brown nearly round lesions. The lesions have concentric rings and also grow fine black matter. As the disease develops, the lesions expand, forming larger dead spots, and finally causing the leaves to wither.

Control methods: When sowing, mix the seeds with chlorothalonil or mancozeb to prevent this disease. In the early stage of the disease, agents such as chlorothalonil, mancozeb, carbendazim, and thiophanate can be sprayed for control, once every week, for 3-4 consecutive times.

3. White spot

White spot mainly damages the leaves. Similar to black spot, except that multiple grayish-white round spots appear on the leaf surface, and around the lesions there is a pale yellow halo. In the late stage of the disease, irregular dead spots also form, and when humid, a grayish-white mold-like substance appears on the back of the lesions.

Control methods: Reasonable crop rotation to reduce the chance of this disease occurring. When the disease occurs, agents such as carbendazim, mancozeb, meixiujing, and methyl thiophanate can be sprayed for control, once every 5-7 days, for 2-3 consecutive sprays.

4. Aphids

Both adult aphids and nymphs can cause damage. They gather in groups on the back of leaves and continuously suck the sap from the leaves, causing the leaves to turn yellow, curl, and deform, and in severe cases to wither and die. Moreover, their reproduction speed is extremely fast, and a large amount of secretion pollutes the vegetables, making them unfit to eat, resulting in relatively large losses.

Control methods: Clean the field to reduce the source of insects. If aphids are found, agents such as dimethoate, juma emulsifiable concentrate, jusha emulsifiable concentrate, and pirimicarb can be used for control. Pay attention to alternating use to avoid developing resistance.

The above are the control methods for shepherd's purse pests and diseases. I hope they can help you. To learn more related knowledge, please follow us.