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What are the control methods for Geranium leaf spot disease?
Symptoms mainly affect the leaves. Initially, small water-soaked spots appear, which later become circular, 2-3 mm in diameter, slightly sunken in the center, with a small brown center and a yellow spreading margin around it. Old lesions can reach 6-10 mm in diameter and, restricted by leaf veins, become irregular in shape, dark brown, with concentric rings, and bear a sparse pale black mold layer on the surface. When there are many lesions on a leaf, they can merge with each other, often causing the leaf to turn black, shrivel and die. The disease conditions mainly occur on older, weakened tissue, so it is most often seen first on the lower old leaves. Rainy weather, excessive
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A Detailed Guide to Geranium Cultivation Methods and Key Technical Points
Geranium is also called "foreign hydrangea" and "balahong." Its flowering period is quite long, from October of the current year to June of the following year, with the peak bloom period being April to May. Flower colors include red, peach red, magenta, flesh red, white, and others. Other cultivated species include large-flowered geranium, shield-leaved geranium, scented geranium, musk geranium, horse-shoe geranium, and others. Geranium is a perennial herbaceous plant, originally growing in the Cape of Good Hope area of South Africa. Because it is drought-tolerant, light-loving, not particular about soil, highly adaptable to the environment, and relatively easy to cultivate, although it was introduced to China only
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What are the propagation methods for geraniums?
For home gardening, in-pot cuttings are generally the most practical method of propagation. The best time for cuttings is April to May or August to September, and the specific cutting time should be determined according to the local growing season with suitable temperatures (18-20°C); the growing medium should be loose, well-aerated and well-draining, ideally a mix of one part sand, one part perlite and one part leaf mold, or medium-coarse river sand, matured soil or expanded perlite, all of which must be sterilized by methods such as exposure to strong sunlight before use. Cuttings can be taken in conjunction with spring or autumn pruning, selecting healthy one-year-old soft shoots free of pests and diseases as cuttings, about 8 cm long,
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How to care for pelargoniums in autumn? These methods must be mastered
Pelargoniums are also known by other names such as butterfly hydrangea, hemp-leaved hydrangea, and large-flowered geranium. To grow this summer-dormant flower well, its autumn care is very important. Because only with proper care during this period can you ensure that the pelargonium has lush leaves and continuous blooms in the other seasons. Within 10 days after the start of autumn, first prune the pelargonium, focusing on cutting away inner branches, dead branches, and leggy branches. This ensures the plant has good ventilation and light. Then knock it out of the flower pot and use a sharp knife to trim away some old roots and old soil, taking care to work gently and cut
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Identification and Control Methods for Common Cherry Blossom Diseases and Pests
There are many types of cherry blossom diseases and pests. The common ones are described below: Perforation-type brown spot disease occurs in May and June. Small purplish-brown spots appear on the leaves, then gradually expand into circles. After the diseased spots dry and shrink, they become small holes. The pathogen mostly overwinters on diseased branches and leaves. The optimum temperature for its development is 25°C to 28°C. It spreads by wind. In rainy seasons, infection and disease development are favored. When the tree is weak, drainage is poor, and ventilation and light penetration are poor, the disease occurs severely. Control methods: (1) Strengthen cultivation management, carry out reasonable pruning, and pay attention to cutting off diseased shoots, timely clearing
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Occurrence Patterns and Control Methods of Cherry Blossom Pests and Diseases
Cherry blossom belongs to the genus Prunus in the rose family (Rosaceae). It has both the subtle fragrance of plum and the gorgeous beauty of peach, with as many as several hundred cultivars. In recent years, with the demand for landscape gardening, cherry blossoms have been widely used in gardens, adding much beautiful scenery to urban landscapes. However, cherry blossoms suffer from many pests and diseases, mainly the following: 1. Cherry blossom witches' broom disease. The symptom is that many short, thin branches emerge from the affected parts, resembling a bird's nest. On these branches, either no flowers or only a few flowers are produced, and the leaves on the branches are numerous and small. Each year, deformed branches increase at the affected parts.
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What are the control methods for the cherry leopard moth borer?
The leopard moth borer, also known as the six-spotted wood leopard moth, belongs to the order Lepidoptera, family Zeuzeridae. Distribution and damage: it is found in Henan, Hebei, Shaanxi, Shandong and other provinces in China. The larvae bore into and feed on the twigs and shoots of many kinds of fruit trees and ornamental trees and shrubs. Damage symptoms: between the xylem and phloem at the base of the affected branch there is a ring-shaped feeding hole, along with a tunnel running from bottom to top. There are several frass-expelling holes on the branch, with large amounts of long oval frass pushed out. The upper part of the affected branch turns yellow and withers, and breaks easily in the wind. Morphological characteristics - adult: female moth body length 20-38 mm, male moth 17-30 mm.
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Symptoms and Control Methods of White Root Rot in Cherry Blossoms
Symptoms White root rot has become increasingly severe in damaging garden trees in recent years, especially in cherry blossoms. The disease mainly occurs on the roots of trees. After the fibrous roots are infected, it gradually spreads to the lateral roots and the main root. Its characteristic symptom is a layer of grayish-white silky mesh covering the diseased roots; afterward the roots rot, causing the cortex to separate, and the root absorption function is severely lost. In mild cases, the cherry blossom grows poorly and the tree vigor weakens; in severe cases, it causes death. Pathogen and disease pattern The pathogen is Dematophora necatrix Harting, and its sexual stage is the rare Rosellinia necatrix. This fungus also infects many plants such as poplar, willow, ginkgo, paulownia, wintersweet, crabapple, mountain peach, tea, spruce, cedar, flowering almond, tree peony and Chinese peony. The pathogen overwinters as mycelium, rhizomorphs and sclerotia in the soil or in diseased plant residues. White root rot is a soil-borne root disease, and its infection cycle is not obvious. In April-May of the following year, under conditions of abundant rain and moist soil, the rhizomorphs spread and transmit through the soil. The pathogen can invade through wounds and lenticels on young roots. Generally, trees planted in poorly drained, weak-growing and waterlogged low-lying land are more severely affected. In the Beijing area, white root rot occurs severely from July to August; later, small black dots, which are the pathogen's perithecia, grow on the mycelial membrane.
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How to manage cherry blossoms in summer? A detailed guide to care methods
1. Mulching with straw to prevent drought. In summer, temperatures are high and evaporation is fast, so the amount of watering is greater than in other seasons, but the principle of "do not water if not dry, and water thoroughly when you do" should still be followed. Cherry blossoms are shallow-rooted plants, and their growing roots are close to the soil surface and dry out easily. Straw can be used to cover the base of the tree, which not only retains moisture and resists drought, but also prevents the cherry tree's fine roots from being washed out and exposed, while greatly reducing evaporation of soil moisture. 2. Wrapping the trunk to prevent drought. Within 2 to 3 years after planting, to prevent the trunk from drying out, it can be wrapped with straw. Because the bark of cherry trees is relatively thin, wrapping the bark can prevent
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What are the control methods for the main pest mites of Sichuan cherry blossoms?
In the Mianyang area of Sichuan, the mites harmful to cherry blossoms are mainly the European red mite (Panonychus ulmi), the hawthorn spider mite (Tetranychus viennensis), and others. The larvae, nymphs and adult mites suck the leaf sap; the damaged leaves develop many small chlorotic spots, and in severe cases the leaves turn pale and scorch, which not only affects plant growth and flowering but also affects photosynthesis. Morphological characteristics: the female adult of the European red mite is 0.45 mm long and 0.29 mm wide, round, with a raised back, dark red; the male adult is 0.3 mm long. Summer eggs are orange-red, winter eggs dark red.
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