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What are the control methods for chrysanthemum powdery mildew?
How do you prevent and control chrysanthemum powdery mildew? Please advise. Chrysanthemum powdery mildew mainly occurs on the upper leaves, stems and buds of the chrysanthemum. The affected parts are covered with a layer of grayish-white mycelium, which spreads from spots into patches, forming a layer of dirty-white powdery substance, causing the leaves to become deformed and the buds to fail to open normally, which affects their ornamental value. The main cause is rainy...
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What are the control methods for black spot disease in chrysanthemums?
How do you control black spot disease in chrysanthemums? Please note that the pathogen is Septoria chrysanthemella. Also known as brown spot and leaf blotch. It is a serious disease of chrysanthemums and occurs everywhere. Symptom characteristics: on infected leaves, purplish-brown spots of round, oval or irregular shape and varying size first appear, and later...
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What are the control methods for Angelica sinensis pests and diseases?
How to control Angelica sinensis pests and diseases? Please give a detailed introduction. For pest and disease control in Angelica sinensis cultivation, you can refer to the following methods: (1) Root rot (Mako disease): mid-April, mid-June, early September, and early November after transplanting are the peak periods of the disease. It damages the roots, and an abundance of soil-dwelling pests favors its occurrence. Control methods: (1) Use 391...
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What are the control methods for Angelica sinensis pests and diseases?
How do you control diseases and pests in Angelica sinensis? Please explain the methods. Here are several control methods for Angelica sinensis pests and diseases for reference: Root rot: soak the seedlings in 1:1:150 Bordeaux mixture, sterilize and kill insects in the soil: burn and smoke the soil more in the seedling bed. Brown spot: pay attention to field hygiene, promptly remove diseased leaves, and in the middle and late stages use 1:1:150...
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What are the effective control methods for chrysanthemum viral disease?
How to effectively control chrysanthemum viral disease? Please explain. Viral disease is a disease that occurs easily on chrysanthemums, and control must be strengthened. 1. Strict quarantine. Chrysanthemum plants with viral disease are virus-carrying bodies. When introducing varieties, strict quarantine must be carried out to prevent the virus from being spread artificially to virus-free areas, or spread out from virus areas and expanding the affected area...
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What are the control methods for sweet osmanthus brown spot disease?
How to control brown spot disease in sweet osmanthus? Please provide guidance. Brown spot disease is a common disease of sweet osmanthus, caused by infection with fungi of the Deuteromycotina. It occurs in both field-grown and potted sweet osmanthus plants. When it occurs, mild cases affect the ornamental effect, while severe cases cause plant death. Symptoms mostly occur on leaves, mostly starting from the leaf tip...
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What are the control methods for leaf blight of osmanthus trees?
How to control leaf blight in osmanthus trees? Please introduce and guide. Leaf blight is a common disease in osmanthus cultivation. Its symptoms: it occurs at the leaf margins and leaf tips. It starts as small light brown spots, then gradually expands into irregular large patches. If several lesions connect, the entire leaf dries up by 1/3-1/2. The lesions are grayish brown to reddish brown,...
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Sugar mandarin (Citrus reticulata 'Shatangju') - Control Methods for Stem-Boring Insects and Key Points of Cultivation Techniques
How to control stem borers in sugar mandarins? Please advise on control methods. The stem borers of sugar mandarins are mainly the larvae of longhorn beetles or jewel beetles. The control methods are as follows: 1. Pricking or hooking out the larvae. From August to September, based on the frass of the larvae in the tunnels, determine the larval instar and whether there are insects and their life stages inside the tunnel, then use a thin, sharp wire from the fresh...
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Identification and control methods of Angelica sclerotinia disease
What is the Angelica yellow swallowtail butterfly? Please introduce the Angelica yellow swallowtail butterfly, also known as the fennel swallowtail, belonging to the order Lepidoptera, family Papilionidae. 1. Damage situation: the larvae cause damage, feeding on leaves at night, causing notches, and in severe cases eating the leaves completely, leaving only the petioles and veins, and also feeding on flowers and fruits. This insect has a large appetite, seriously affecting the growth of Angelica, ...
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How to prevent and control Angelica rust? Detailed explanation of control methods
How to control cutworms in Angelica? Please advise. Cutworms, also known as "soil silkworms" or "black soil silkworms", belong to the order Lepidoptera, family Noctuidae. The main cutworms affecting Angelica are the black cutworm and the yellow cutworm, and their damage conditions and control measures are the same. 1. Damage situation: The larvae damage Angelica seedlings, hiding by day and emerging at night; in the young larval stage they mostly feed on tender leaves...
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