1. What are the pests and diseases of Ligustrum lucidum?
Diseases and pests of Ligustrum lucidum. Divided into diseases and pests. Common diseases include brown spot, black spot, damping-off and so on. Common pests include leaf curl moth, chilblain moth, mulberry wing moth, Shanxi mealybug, American white moth, white grub, American leaf miner, yellow silk worm, mealybug and apple bug.
Second, pictures of diseases and pests of Ligustrum lucidum and their control methods
1. Common diseases
(1) brown spot disease
Brown spot is caused by a semi-unknown fungus Alternaria, which mainly damages the leaves of Ligustrum lucidum. It is a small reddish-brown plaque with black mold in the center and purple halo around it, and the lesion develops in a continuous way. The onset time of brown spot disease is from June to July, and the peak period is from August to September. High temperature, high humidity and closed environment will aggravate the condition.
Prevention and control methods: disinfect the soil with quintozene or formalin in the early stage of planting, and do not apply more nitrogen fertilizer in the growing period. At the onset stage, 75% chlorothalonil wettable powder 800 times or 70% thiophanate-methyl wettable powder 65,438+0,000 times was used for prevention and treatment, and it was sprayed 1 time every week for 3-4 consecutive times.
(2) Coal stain
Sooty blotch may be the place where round black mildew spots will appear on the leaves of Ligustrum lucidum, while the pathogen of sooty blotch is coal-burning fungi, which is one of the half-baked fungi. Generally, after a large number of mealybugs and mealybugs occur, pathogenic bacteria begin to multiply in large numbers.
Prevention and control methods: pruning should be strengthened during the growth period, and the nursery should avoid high temperature and high humidity environment. The mealybug and mealybug should be controlled in time in the early stage. In case of sooty blotch, 800 times solution of 75% chlorothalonil wettable powder, 400 times solution of 70% mancozeb or 600 times solution of 50% bactericide wettable powder should be used for prevention and control.
(3) Rhizoctonia solani
Dead leaves of Ligustrum lucidum. Could be cataplexy. After the disease occurred, the growth of Ligustrum lucidum plants was slow. Will lose luster, leaves will wither, branches epidermis will easily separate, underground fibrous roots will die, easy to break. Rice sheath blight occurs in early June every year, and the peak period is July-August.
Control method: Soil disinfection before planting can prevent rice sheath blight. At the beginning of the disease, 75% chlorothalonil wettable powder 300 times solution or 70% thiophanate-methyl 500 times solution was used once every 10 day, for a total of 1 month, and the diseased seedlings were pulled out in time and burned.
2. Common pests
See above for common pests of Ligustrum lucidum. The insect is prone to occur in the growing period, especially after the temperature rises, in spring and summer, especially in the case of high temperature and humidity in the nursery, or improperly managed, or infected by surrounding plants, resulting in large-scale pests.
Control method: For the eggs of mealybug and mealybug, you can spray 100 times Huabao emulsion or 10% imidacloprid 2000 times; Spraying 100-200 times of Bt emulsion, 1000-2000 times of diflubenzuron No.3, 6000 times of diflubenzuron or 1.000 times of diflubenzuron per milliliter in the larval stage of apple nevus. For the six-star black-spotted beetle and coffee beetle, 200 times of 40% omethoate emulsifiable concentrate, 3000 times of triamcinolone acetonide or carbofuran can be used to irrigate the roots. 3% methyl isofenphos granules or 5% phoxim granules to control white grubs; Spraying 2000 times solution of abamectin or 2000 times solution of 40% omethoate on Tetranychus privet; Chlordimeform 1 8000 times solution for controlling Hyphantria cunea; Use 1500 times of 40% omethoate EC and 2,500 times of 2.5% deltamethrin EC to control silkworm moth.
The above is the introduction of Ligustrum lucidum diseases and insect pests, pictures of Ligustrum lucidum diseases and insect pests, and control methods. Ligustrum lucidum is generally well managed, but if seedlings are raised on a large scale, special attention should be paid to the prevention and control of pests and diseases in the management process. In addition, in landscaping maintenance, we should pay attention to observing the diseases and pests of Ligustrum lucidum and prevent them in time.