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Occurrence Patterns and Control Methods of Black Spot Disease in Impatiens
Black spot disease of Impatiens is an important disease in the production and cultivation of Impatiens. It occurs commonly in our country and causes serious damage, so it should be taken seriously. Symptoms: The disease damages leaves, especially the older leaves in the middle and lower parts, which are susceptible to infection. Affected leaves develop circular or oval spots that are dark brown, 2-10 mm in diameter, with inconspicuous concentric rings and darker edges. When the disease is severe, the spots can expand and merge into patches, and on the spots appear pale green or olive-black mold-like growth, which is the pathogen's conidiophores and conidia. This causes the diseased leaves to shrivel and die.
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Occurrence Patterns and Control Methods of Cotton Seedling Diseases
Cotton seedling diseases are characterized by a concentrated onset period, generally occurring 15-30 days after sowing. The primary infection source comes mainly from the soil, with a small portion from seeds. Around April 20 this year, many provinces experienced continuous rainy and low-temperature weather, so seedling diseases are bound to be severe, and timely control measures should be taken in all areas. I. Symptom Manifestations (1) Damping-off. When cotton seedlings are affected before emergence, it causes seed and sprout rot. When disease occurs after seedling emergence, lesions initially appear as yellowish-brown and later turn black and sunken at the base of the young stem near the soil surface. The lesions gradually expand,
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Detailed Explanation of the Occurrence Patterns and Control Methods of the Jujube Inchworm
The jujube inchworm, also known as the jujube spanworm, dingmenchi, or gongyao worm, belongs to the order Lepidoptera, family Geometridae, and is one of the major pests of jujube leaves. I. Occurrence Patterns The larvae damage the tender buds, leaves, and flower buds of jujube. It has 1 generation per year, overwintering as pupae in the soil 10-15 cm deep around the tree canopy. In early March of the following year, they emerge as adults. After mating, they lay eggs. The female adults are wingless and must crawl up the tree trunk to lay eggs. After an egg stage of about 22 days, from late March to early April, the larvae hatch and climb up the tree to cause damage. Larvae in the 1st to 3rd instars have a small appetite and mainly feed on tender leaves.
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Fox Molting Patterns and Methods for Assessing Pelt Maturity
Foxes begin shedding and replacing their underfur every spring, and the guard hairs then quickly fall out and new guard hairs grow in. Molting in foxes starts first at the head, neck, and forelimbs, then moves to the flanks, back, and abdomen, and only last do the rump and tail hairs shed and regrow. The completion of hair replacement on the body surface does not mean that the fox's fur and skin are fully mature. The assessment of pelt maturity is mainly based on indicators such as the color, fineness, density, length, softness and flexibility of the fur, as well as the color, thickness, and strength of the skin.
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How to prevent and control garlic heart rot? Occurrence patterns and integrated control techniques
In recent years, the garlic industry in Pizhou City has developed rapidly, with the planting area growing from 3,333 hectares in the 1970s to 33,000 hectares in 2004, making it the largest garlic production area in the country and a national standardized high-quality garlic production demonstration county (city). However, with the expansion of garlic cultivation area and the extension of continuous cropping years, various pests and diseases have become increasingly severe, especially the damage from garlic heart rot, which has worsened year by year and seriously affects garlic yield and quality. 1 Occurrence patterns and damage symptoms ① Occurrence patterns In late February 2002
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Occurrence Patterns and Control Methods of Garlic Blight
I. Symptoms Garlic blight mainly damages the leaves. In the early stage of infection, pale white to light yellow water-soaked spots appear in the middle of the leaf or at the leaf tip, with light green edges. The lesions expand quickly, and within 3 to 5 days half of the leaf or the entire leaf wilts and droops. When humidity is high, the lesions rot, causing the whole plant to die. II. Pathogen and Transmission Routes The pathogen overwinters as mycelium and chlamydospores in the underground parts of diseased plants or in the soil. When conditions are suitable the following spring, the diseased parts produce sporangia and zoospores. The zoospores spread through wind, rain and irrigation water, causing primary infection and secondary infection. III
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How to control the Japanese wax scale on goldenrain tree? First understand its occurrence pattern
The Japanese wax scale (Ceroplastes japonicus Gr.) belongs to the order Homoptera, family Coccidae. Also known as the Japanese wax scale and the jujube armored wax scale, commonly called the jujube louse. When it breaks out over large areas on goldenrain trees, in severe cases the entire tree's branches and leaves are covered with the insects, and female insects attached to the twigs look like snow from a distance. The nymphs suck sap on the leaves, and their excrement covers the whole tree, weakening the tree's vigor and seriously affecting the landscaping appearance. Through two years of investigation and study, the occurrence pattern of this pest was clarified, and a satisfactory control method was found. This pest
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Detailed Explanation of the Fertilizer Requirement Patterns of Lilies Throughout the Growing Period
Understanding the fertilizer requirement patterns of lilies at each growth stage is very beneficial for rational fertilization and promoting high yields. The patterns of lily demand for the three major nutrients: 1. Nitrogen fertilizer: The nitrogen absorption rate of lilies varies at different growth stages. At emergence, the nitrogen absorption rate is 3.5537 probit units, and the cumulative nitrogen absorption percentage is 7.4%, equivalent to 0.201 kg of nitrogen absorbed per mu. This indicates that during the seedling stage, in addition to receiving nutrients from the mother bulb, the plant also needs to absorb a certain amount of nitrogen from the soil. 2. Phosphate fertilizer: At emergence, the phosphorus
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Occurrence Patterns and Control Methods of Lily Leaf Blight
Lilies originate from the eastern and central regions of China. They are relatively cold-tolerant, prefer strong light, and do not tolerate shade. Insufficient light will affect growth and flowering. A well-drained sandy loam rich in organic matter is suitable. Their disease resistance is poor, and they are susceptible to disease under high temperature and high humidity conditions. Lily plants are upright and elegant, with large, brightly colored flowers and many varieties. They are suitable for planting in patches or clumps at the edges of lawns or for forming flower borders, creating a quiet and harmonious effect. Lilies are also treasures for potted flowers and cut flowers. Lily leaf blight, also known as lily gray mold, affects the plant's photosynthesis, hinders growth, and reduces ornamental value. When the disease occurs severely,
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Occurrence Patterns and Integrated Control Methods of Pests and Diseases in Goji Berry
Goji berry is a deciduous shrub of the genus Lycium in the Solanaceae family. Its fruit is called goji berry (Lycii Fructus), and its root bark is called Digupi (Lycii Cortex); both can be used as medicine. The tender stems and leaves are eaten as vegetables. It is distributed throughout China, mostly in the wild. The related species Lycium barbarum (Ningxia goji) is mostly cultivated; its fruit is called Xi goji or Gan goji and is used medicinally, mainly produced in Ningxia, Gansu and Inner Mongolia. Goji berry suffers from pests and diseases at every stage of growth, causing great economic losses to production. The occurrence and control methods of goji berry pests and diseases are introduced as follows: 1 Diseases 1.1 Black fruit disease (anthracnose) Main
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