Mr. Li of Shandong said that the medicinal plants were planted in the Jiangxi production base and the wind was protected. A disease occurred in the stem of the plant, causing the whole plant to die and die. Want to know what the disease is? What pesticide should I use for prevention?
Annisomelesindica, also known as parsnip, is used as a whole herb. Diseases may occur during field planting and production. According to the disease samples provided to you in the laboratory of the Institute, the disease examination analysis is carried out, and the diagnosis is (1) disease symptoms: the seedling stage has a water-soaked soft rot at the base of the stem, which is dark brown, the upper part of the stem is lodging, and the seedlings are withered. . The lesions of the leaves are nearly circular, with enlarged yellow-green edges and dark brown in the center; the stems are damaged, and the lesions at the base, stem and branches of the stem are initially water-soaked, followed by brown or dark brown streaks, above the diseased part. The leaves of the leaves are rapidly wilting. (2) Identification of pathogens: The disease samples were isolated and cultured under aseptic conditions. After 4 days at 25 °C, white hydatiform hyphae were seen. Under the microscope, filamentous chromophoric cysts were seen, and the oval-shaped sporangia was topped. The result of preliminary identification is that the disease is caused by the infection of a Phytophthora Phytophthora (Phytopthorasp.).
China Pesticide Network Xiaobian teaches you specific prevention measures:
(1) Agricultural control: take rotation, sorghum deep ditch, remove sick plants, timely drain after heavy rain, prevent excessive humidity in the field; collect seeds of disease-free land and mix with new high-fat film to isolate bacteria and increase germination rate; Applying nitrogen fertilizer, not planting too dense, so that ventilation and light transmission are good and other cultivation measures.
(2) Chemical control: The pesticide manufacturer recommends using a new high-fat film 400 times liquid + tree guard general spray before the onset or early onset, disinfecting and disinfecting, blocking the virus replication and propagation path.
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