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Comprehensive Prevention and Control Methods and Techniques for Common Rhododendron Diseases
The main diseases of rhododendrons include root rot, brown spot, black spot, leaf blight, and iron deficiency chlorosis. After a rhododendron contracts root rot, its growth weakens, the leaves wilt and dry up, and water-soaked brown patches appear on the root surface; in severe cases soft rot develops, with gradual decay and peeling of the bark, and the xylem turns black. This disease occurs most easily under conditions of high temperature and high humidity. The control method is to strictly disinfect the potting soil before repotting, and to keep the soil loose and moist with good permeability, avoiding waterlogging. If an affected plant is found, promptly deal with the diseased plant and the potting soil. For treatment
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What are the control methods for the black locust seed chalcid?
Methods for controlling the black locust seed chalcid: 1. Strict seed quarantine; it is strictly forbidden to transport seeds carrying the pest elsewhere. 2. Strengthen the management of mother trees; when pests are found, control them with chemical agents. During the adult emergence period, fumigate with 741 dichlorvos tube-inserted smoke agent. Spray with 80% dichlorvos emulsifiable concentrate at 800 to 1000 times dilution, 40% dimethoate emulsifiable concentrate at 1000 to 1500 times dilution, or 20% fenvalerate emulsifiable concentrate at 1500 times dilution. 3. Soaking seeds in hot water (60°C) for 15 minutes can kill the larvae inside the seeds, or use 10% to 20% salt water to select seeds.
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What are the control methods for the black locust seed moth?
Methods for controlling the black locust seed moth: 1. After leaf fall, clear away the remaining seed pods to destroy the overwintering larvae inside them. 2. During the peak occurrence period, spray 50% fenitrothion emulsifiable concentrate at a dilution of 1000 to 1500 times, or 40% dimethoate emulsifiable concentrate at 800 to 1000 times. 3. Protect and use natural enemies. 4. Before sowing, select seeds with 20% salt water, scoop out the floating insect-infested seeds and burn them.
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How to control black locust aphids? Master these methods for good results
Control methods for black locust aphids: 1. Protect natural enemies such as ladybugs, hoverflies, green lacewings and aphid parasitoid wasps. 2. Strengthen pest monitoring and forecasting. When the number of winged aphids suddenly increases and the rate of aphid-infested plants reaches 20% to 30%, spray pesticide promptly. If the ratio of ladybugs to aphids reaches 1 to 100, and the aphid population shows a declining trend, stop spraying pesticide for control and protect natural enemies. 3. During the peak outbreak period, spray 50% pirimicarb wettable powder at 1500 times dilution, 10% imidacloprid wettable powder at 1500 times dilution, or spray EB-82 aphid-killing fungus at 300 times dilution
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What are the control methods for the black-marked looper moth on black locust?
Control methods for the black-marked looper moth on black locust: 1. Use light traps to kill adult moths. 2. Protect and make use of natural enemies, such as braconid wasps. 3. During the outbreak period, spray insecticides such as 50% fenitrothion emulsifiable concentrate at 1000 to 1500 times dilution, 2.5% deltamethrin emulsifiable concentrate at 2000 to 3000 times dilution, or 90% trichlorfon crystal at 800 to 2000 times dilution.
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What are the control methods for the Privet Hawk Moth (Clanis bilineata)?
Control methods for the Privet Hawk Moth (Clanis bilineata): 1. Use light traps to kill adult moths. 2. After larvae enter the soil or before adults emerge, dig the soil as appropriate to destroy larvae and pupae. Or spray 25% phoxim on the ground to poison the pupae in the soil. Or apply drip irrigation. Before applying the pesticide, first clear weeds, dead branches and fallen leaves from the ground. After applying the pesticide, mix the soil evenly with a hoe to improve the control effect. 3. During the larval occurrence period, spray a 500-fold dilution of Bt emulsion containing more than 100 billion spores per milliliter, or a 1000-fold dilution of 90% trichlorfon crystal.
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How to control the black locust geometer moth? A full breakdown of practical methods
Control methods for the black locust geometer moth: 1. Manually dig the pupae out of the soil and feed them to poultry. 2. During the adult emergence period, pile sand at the base of the trunk or tie a 5 to 7 cm wide plastic film band to prevent the wingless moths from climbing the tree. 3. During the young larval stage, spray a 3000-fold dilution of 20% diflubenzuron, or a 2000-fold dilution of 50% phoxim emulsifiable concentrate or 20% fenvalerate insecticide emulsifiable concentrate. 4. Use light traps to kill the adults.
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How to control the black locust grain moth? Detailed control methods
Control methods for the black locust grain moth: 1. During the peak emergence period of adults, spray 80% dichlorvos emulsifiable concentrate, or 4.5% beta-cypermethrin emulsifiable concentrate, or 2.5% deltamethrin at a 2000- to 4000-fold dilution. 2. During the larval damage period, apply a 1:30 dilution of 80% dichlorvos and kerosene, or a 1:20 dilution of diesel oil, brushing it onto the infested patches.
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Licorice Disease Prevention and Control Methods and Key Technical Points
(1) Rust disease: When infected, yellowish-brown scar-like lesions appear on the underside of the leaves. After the epidermis ruptures, brown powder is released; this is the uredinium of the pathogen. From August to September, dark brown telia form, causing the leaves to turn yellow and wither, and in severe cases to fall off. Control methods: Apply more phosphorus and potassium fertilizer to improve the plant's disease resistance. Remove diseased plant debris and burn it in a centralized manner. At the early stage of the disease, spray with 15% triadimefon at 1000 times dilution, or 97% diniconazole at 400 times dilution. (2) Brown spot disease: It damages the leaves, and affected leaves develop round or irregular lesions. The
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How to control licorice aphids? Master these methods
They damage tender leaves, tender shoots, flowers and fruits. Adults and nymphs suck plant sap; in severe cases they can cause leaves to turn yellow and drop, affecting seed set and marketable yield. Control methods: ① Avoid planting next to leguminous plants. ② During the occurrence period, spray with 40% dimethoate emulsifiable concentrate at 1000 times dilution.
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