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How to control brown spot disease in lotus root cultivation?
How to control brown spot disease when growing lotus root? Please give an introduction. For growing lotus root, the following methods can be used to control brown spot disease: 1. Symptoms. This disease mainly damages the leaves and leaf stalks of lotus root. In the early stage of leaf infection, small brownish-green spots appear, which later expand into reddish-brown to dark brown irregular to polygonal necrotic lesions...
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Symptom Identification and Control Methods of Lotus Root Black Spot Disease
What is lotus root black spot disease? How to control it? Please explain: in the early stage of lotus root black spot disease, needle-tip-sized yellowish-brown small spots appear; in the later stage, the entire leaf is covered with lesions that have concentric rings, causing half or the whole leaf to dry up. Control: increase the application of phosphorus and potassium fertilizers, and avoid over-applying nitrogen fertilizer. In winter, thoroughly remove diseased and residual leaves from the field and burn them in a centralized manner; in the early stage of the disease, remove...
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How can weed control in summer soybean planting be effective?
How do you control weeds when planting soybeans in summer? Please give an introduction. After summer soybeans are sown, the soil and climatic conditions favor weed germination and growth. If chemical control is not carried out in time, it is very easy for weeds to run wild. In production, based on the characteristics of weed occurrence in summer soybean fields and the properties of herbicides, pesticides should be applied early for control. Soil-incorporated treatment: after land preparation, per...
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What are the control methods for the meadow moth on summer soybeans?
How to control the meadow moth on summer soybeans? Please allow me to explain. The meadow moth on soybeans has risen from a secondary key pest of summer soybeans in the past to a primary key pest. Newly hatched larvae feed on the mesophyll of tender young leaves, leaving the epidermis; after the 3rd instar their food consumption increases greatly, and they eat the leaves into notches with only the veins remaining. In ordinary years yield is reduced by 10%-15%, in severe years...
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What are the control methods for the tobacco pear psyllid?
How to control the tobacco pear psyllid? The occurrence characteristics of the pear psyllid are many generations. The adult emergence period is long and generations overlap. Especially from late June to early July, the nymphs secrete a large amount of mucus, causing a large number of fallen leaves, which not only seriously affects tree vigor, but also reduces pear fruit quality, and it is difficult to control with general pesticides. Use tob...
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How to prevent and control late blight in kiwifruit during hot and humid weather?
How to prevent and control late blight in kiwifruit during hot and humid weather? Please explain the methods. Kiwifruit late blight is a fungal disease. It rarely occurs during the seedling and mature plant stages of kiwifruit, mainly affecting kiwifruit leaves and fruit, with fruit generally suffering more severe damage. Infected leaves form dark green water-soaked lesions with indistinct edges, which turn brown after expanding...
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What are the control methods for lotus root rot?
How do you control rot when growing lotus root? Please give an introduction. Lotus root rot, commonly called stalk rot, mainly damages the underground stem, and the leaves and stalks can also be affected. Affected leaves form green wilt-colored patches along the leaf margins and curl downward, then the whole leaf turns brown, and the leaf stalk shrivels and dies from top to bottom. When it occurs severely, the whole field turns a withered yellow, caus...
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What are the control methods for onion viral disease?
How do you control onion viral disease? Please advise. The main onion diseases include yellow dwarf disease (viral disease), downy mildew, soft rot, gray mold and purple blotch. In recent years, onion viral disease has been a major disease in production. 1. Symptoms: it can occur during the seedling stage and the plant growth stage. After the plant is infected, the leaves become twisted, ...
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What are the control methods for onion soft rot?
How do you control onion soft rot? Please provide guidance. Onion soft rot can be controlled by referring to the following methods: 1. Early-stage control (1) Seedling preparation: choose disease-resistant varieties for raising seedlings in the nursery, eliminate diseased and weak seedlings, and cultivate healthy and strong seedlings. (2) Crop rotation selection: choose plots with good ventilation and light transmission, with relatively good previous crops such as corn and wheat; avoid continuous cropping, carrot stubble, and stubble of Liliaceae vegetables such as garlic, and try to avoid stubble such as autumn cabbage and potato that easily leaves soil-borne disease residues. (3) High-ridge planting: in areas where conditions permit, ridge planting is recommended, with onions transplanted on high beds, which can reduce waterlogging and lower the chance of pathogen infection. (4) Strengthen field management: timely cultivation and weeding, increase soil temperature, promote onion development, and help the onion population resist invasion and infection by soft rot pathogens.
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What are the control methods for onion anthracnose?
What control methods are there for onion anthracnose? Please introduce them. Onion anthracnose can be controlled by referring to the following methods: (1) Agricultural measures. In severely affected fields, rotate with non-allium crops and cultivate disease-resistant varieties. (2) Chemical control. Spray fungicides at the early stage of disease onset and before the rainy season. You can use 25% Shibaike emulsifiable concentrate at 1000 times dilution, or 50% prochloraz manganese salt (Shibaogong) wettable powder at 1500 times dilution...
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