Detailed Explanation of the Latest Pest and Disease Control Methods for Shepherd's Purse

Shepherd's purse is a relatively common wild vegetable. Because it can be stir-fried, used as filling, or boiled in soup, and because it tastes delicious and is rich in nutrients, it is deeply loved by people and is cultivated throughout the country. However, during the growth of shepherd's purse, various pests and diseases can cause damage. Let's take a look below at the control methods for shepherd's purse pests and diseases.

1. Downy mildew

Downy mildew mainly harms the leaves of shepherd's purse. It mostly occurs in plots with high temperature and high humidity and poor drainage. In addition, environments 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. In dry environments, the leaves wither, while in humid environments, the leaves rot.

Control methods: Practice reasonable crop rotation, and 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 occurrence. When the disease occurs, alternate spraying with agents such as mancozeb-metalaxyl, mancozeb, chlorothalonil, and carbendazim can be used for control.

2. Black spot

Black spot also mainly harms the leaves. When the disease occurs, it generally appears first on the outer leaves, with light brown or brown nearly circular lesions. The lesions have concentric rings and also bear tiny black structures. As the disease develops, the lesions expand and form larger dead spots, ultimately 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, spraying with agents such as chlorothalonil, mancozeb, carbendazim, and thiophanate can be used for control, once every week, for 3-4 consecutive times.

3. White spot

White spot mainly harms the leaves. Similar to black spot, except that multiple grayish-white circular spots appear on the leaf surface, surrounded by light yellow halos. In the later stage of the disease, irregular dead spots also form, and in humid conditions a grayish-white mold-like substance appears on the back of the lesions.

Control methods: Practice reasonable crop rotation to reduce the chance of this disease occurring. When the disease occurs, spraying with agents such as carbendazim, mancozeb, meixiujing, and thiophanate-methyl can be used for control, spraying 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 become deformed, and in severe cases to wither and die. Moreover, their reproduction speed is extremely fast, and large amounts of secretions pollute the vegetables, making them unfit to eat, causing relatively large losses.

Control methods: Clean the field to reduce sources of the insects. If aphids are found, agents such as dimethoate, juma emulsifiable concentrate, jusha emulsifiable concentrate, and pirimicarb can be used for control. Be careful to alternate their use to avoid resistance.

The above are the control methods for shepherd's purse pests and diseases. We hope this can help you. If you want to learn more related knowledge, please follow us.