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Control Methods for Common Diseases and Pests of Golden Privet
The diseases commonly affecting golden privet (Ligustrum vicaryi) mainly include: leaf spot, ring rot, and sooty mold. The main pests include: scale insects and white grubs. Brown spot disease Brown spot disease is the most serious leaf spot disease of privet and is caused by pathogenic fungi. In the early stage of the disease, small brown spots appear on the leaves, surrounded by purplish-red halos, and black mold-like substances are visible on the spots. As the temperature rises, several spots sometimes merge together, and eventually the leaves wither and fall off. The optimum temperature range for the growth of this pathogen is 25°C to 30°C, and the optimum temperature for spore germination is 1
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Common Pests and Diseases of Golden Privet and Their Control Methods
Content: We have a large area of golden privet (Ligustrum vicaryi). Every year in the hot, humid season, the leaves drop in patches until the plants turn yellow and wither. What is the cause, and how can it be controlled? Reply: It may be "golden privet leaf spot" caused by a fungus. Once the plum rain season ends, it spreads everywhere, and affected golden privet quickly loses all its leaves. It is generally caused by planting density being too high, and in recent years it has appeared in large numbers in Shanghai. Control: spray with a fungicidal pesticide.
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Dawn Redwood (Metasequoia glyptostroboides) Cutting Propagation Methods and Key Technical Points
Dawn redwood propagation by cuttings: from late March to early April, take cuttings and insert them immediately. Cut cuttings from 1- to 2-year-old seedling stock plants or from new shoots sprouted in the current year. Treat the lower end of the cuttings with naphthaleneacetic acid at a concentration of 0.5 per 10,000 (0.005%), soaking for 20 to 24 hours to promote rooting and improve survival. Insert about 120 cuttings per sq m. After insertion, keep the seedbed moist. New roots sprout in about 40 days; apply diluted human urine and manure once every 10 days, for 3 to 5 consecutive applications. In June, nitrogen fertilizer may be applied in small amounts several times, at 3 to 4 kg of urea per mu, diluted with water and poured on. In early August, apply phosphorus and potassium fertilizer once; per mu use
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Planting Methods and Care Tips for the Blue Spruce
Native to the United States, it gets its name from its bright silvery-blue foliage. An evergreen tree, up to 15 m tall, with a crown spread of up to 5 m, and a conical to columnar crown. The bark is scaly and gray-red. The branchlets are sturdy and brown-red. The leaves are 2 cm to 3 cm long, four-angled and linear, stiff and straight, bright silvery blue-green. The cones are green at first, later light brown, 7 cm to 12 cm long. The bright foliage is highly decorative, and when planted together with other tree species it can achieve a striking color effect. It prefers light and tolerates slight shade.
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Cultivation Management Methods and Care Key Points for Potted Azaleas
Azaleas are very beautiful, and everyone is willing to grow them, but how can they be grown well? There are many finer points here: Azaleas prefer slightly acidic soil and water, and are afraid of alkaline soil and water, and afraid of waterlogging; they like warmth and coolness, and are afraid of dry heat; they like moist environments, and are afraid of dry air; they like partial shade, and are afraid of blazing sun; they like light fertilizer, and are afraid of concentrated fertilizer. What soil to use? Larch humus soil has suitable acidity, is loose in texture, fertile, and has good water permeability, making it suitable for azalea growth. What water to use? For azaleas, water with a pH value below 7 is suitable. In areas where the water quality tends to be alkaline, in addition to storing rainwater and snow water, acidified water can be used, that is, add to 100 jin of water
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Cultivation and Management Methods for Large Potted Azaleas
The Wuxi Azalea Garden where the author works mainly grows azaleas in pots. The garden has a number of large azaleas over fifty or sixty years old, which are quite difficult to manage. In addition, it hosts the annual azalea flower show every year, and after the show the azaleas generally resume growth about 20 days later, right when they face the extremely unfavorable hot summer for azalea growth. In order to strengthen azalea growth, we gave careful thought to the growing medium. Azaleas have shallow, fine roots and high requirements for potting soil. In the past we always used orchid soil as the growing medium for repotting. In recent years we found that the quality of some orchid soil on the market
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Scientific Management Methods and Key Care Points for Azaleas
Azaleas prefer scattered light and a cool, humid climate, and fear scorching sun exposure. Therefore, suitable conditions of light, temperature and humidity should be adjusted for scientific management. At the same time, special attention should be paid to the acidification treatment of soil and water quality. After the beginning of autumn, once the nighttime temperature drops below ten degrees Celsius, move them indoors to a sunny spot. After the beginning of winter, move them to a cooler shady place without light exposure to let them go dormant. The suitable temperature at this time is around four degrees, and there is no need to water as long as the soil is not dry. In early spring in February, move them to a spot with scattered light at a room temperature of around nine degrees. After
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Detailed Explanation of Azalea Shaping and Pruning Methods and Techniques
Q: How should azaleas be shaped and pruned? A: Azaleas have a very strong ability to sprout and send out branches, so pruning is necessary to regulate and control the distribution of nutrients within the plant, so that it grows vigorously, forms a reasonable and beautiful tree shape, and can bloom abundantly with bright, vivid colors. During the seedling stage, the main pruning method is pinching, that is, pinching the current year's branches when they grow to 4 or 5 cm, in order to encourage branching. After pinching, 2 or 3 lateral buds will sprout from the upper end of the remaining branch. In this way, through 2 or 3 years of cultivation, a good
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Symptom Identification and Control Methods for Azalea Leaf Gall
Symptoms: Azalea leaf gall, also known as cookie disease. The young tissues of azaleas can all be affected, mainly damaging flower buds, young leaves and new shoots. On the upper surface of the leaves, initially pale yellow semi-transparent round spots appear, later turning yellow and sunken; the underside of the leaves is pale red, thickened and swollen, subsequently raised into galls, with a thick grayish-white powdery layer on the gall surface, like a cookie, and the leaves wither, yellow and fall early. In severe cases, the petiole lesions merge into patches, deformed and thickened. When young shoots are affected, fleshy lotus-like leaves or tumor-like leaves are produced at the tips, later shrinking into sac-like forms. After the petals are infected, they become abnormally thickened, forming irregular galls.
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Identification and Control Methods for the Azalea Lace Bug
The azalea lace bug, also called the azalea lace bug (Stephanitis pyrioides), and "little stink bug." Adults are about 3.5 mm long, dark brown, with wings covered in a network of veins; the forewings are slightly rectangular, and at rest the dark brown markings on the wings form an "X" shape. Nymphs resemble the adults but are tender and small, wingless, and about 2 mm long. Eggs are 0.6 mm long, oval, milky white, laid along the midrib and larger leaf veins, pale green when first laid and later turning pale yellow. There are 3 to 4 generations per year. Adults overwinter from mid to late October in bark and soil crevices and other such places, and the following year
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