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Identification of Symptoms and Control Methods for Powdery Mildew on Impatiens
Symptoms This disease mainly occurs on the leaves and tender shoots. It generally begins in June, and after July the leaf surface becomes covered with a white powdery layer. Subsequently, small yellow granules form within the white powdery layer, and the color gradually deepens, finally turning dark brown. Transmission route The pathogen overwinters in diseased plant residues and seeds. The following year, when environmental conditions are suitable, the pathogen spreads via wind and rain. August to September is the peak period of the disease. Control methods 1. Do not plant too densely, provide appropriate ventilation, strengthen fertilizer and water management, and enhance the disease resistance of the plants. Remove diseased leaves and diseased plants
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Symptom Identification and Control Methods for Southern Blight in Impatiens
Southern blight in impatiens attacks the roots, stems and fruits of plants, causing damping-off, root rot, basal rot and fruit rot. This disease can also harm plants such as iris, orchids, peonies, peaches and plums. Symptoms: In the early stage of the disease, a brownish-black wet rot appears at the base of infected plants, later followed by white silky mycelium and the formation of sclerotia the size of rapeseeds. In the late stage of the disease, severely infected plants collapse with damping-off. Pathogen: The pathogen is Sclerotium rolfsii Sacc., belonging to the Deuteromycotina
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Propagation Methods and Key Cultivation Management Techniques for Garden Balsam
Propagation method: propagate by seed. 1. Site selection and land preparation: a sunny site with moist, fertile, loose and well-drained soil is preferable. Apply base fertilizer, prepare the land and make beds; make raised beds in the south and level beds in the north, with a bed width of 1.2 m. 2. Sowing method: the seeds are tiny and have a long viability; stored at room temperature for 3 years, their germination rate still reaches 79.7%. Sow directly in the field, in March in the south and April in the north. With a row spacing of 35 cm, open shallow furrows 1 cm deep, scatter the seeds evenly into the furrows, cover with soil and press lightly, then water. After sowing, keep
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Symptoms and Control Methods of Alternaria Leaf Spot on Impatiens
[Symptoms]The spots on affected leaves are round to oval, dark brown, slightly zonate, 2-10 mm in diameter, with a slightly darker margin. Some spots may expand and merge into patches, bearing a pale green or olive-black mold-like growth, which consists of the pathogen's conidiophores and conidia. The older leaves in the middle and lower parts of the plant are more susceptible; in severe cases, the diseased leaves shrivel and die. [Pathogen]Alternaria tenuis Nees., belonging to Deuteromycotina, genus Alternaria, a fungal pathogen. Conidiophores are erect, brown,
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Symptoms and Control Methods of Anthracnose in Impatiens
[Distribution] Shanghai, Hangzhou. [Symptoms] Both branches and leaves can be affected, mainly on the branches and leaves. In the early stage of the disease, small withered-yellow or brown spots appear on the leaf surface, then gradually develop into circular to nearly circular spots, light brown to brown, with a darker edge and indistinct concentric rings, and small black dots scattered on the lesions; as the disease progresses, adjacent lesions join to form irregular large spots, causing the leaves to shrivel, wilt, and drop off. In humid weather, pink gelatinous material oozes from the small black dots; it can occur from June to September, and sometimes causes the branches and stems to turn black and rot.
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Symptom Identification and Control Methods for Impatiens Downy Mildew
[Symptoms] Mainly affects the stem. At first, oily dark green streaky patches appear at the root-stem junction, rapidly expanding into irregular dark brown areas; in severe cases, the entire stem and leaves turn black, the plant quickly collapses, and the root crown becomes sunken, causing the plant to lodge and die. Under saturated humidity persisting for a long time, sparse white mold grows on the diseased areas, which are the pathogen's sporangiophores and sporangia. [Morphological characteristics of the pathogen] It grows rapidly and produces abundant spores on CMA, OMA, and V4A media, while on PDA medium it grows
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Symptoms and Control Methods of Root Rot in Impatiens
It occurs in all impatiens cultivation areas and can cause plant death. Symptoms mainly infect the root crown and lower parts of impatiens, with grayish-brown lesions appearing initially, which then rapidly expand, causing the roots to become slightly swollen and turn dark brown and rot; after the root crown tissue rots, it loses water and appears shrunken. The aboveground parts show sudden wilting of diseased plants, gradually worsening, resembling temporary water shortage, but this is irreversible after watering. Disease pattern: the pathogen is a fungus, Rhizopus arrhizus-like. The pathogen overwinters in the soil with diseased plant residues. Soil that is too wet, high temperatures,
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Control Methods for the Giant African Snail on Impatiens
The giant African snail on impatiens, scientific name Achattna fulica Ferussac, synonyms A. couroupa Lesson, A. fulica Tiyon, order Stylommatophora, family Achatinidae, also known as the African snail. Native to the coastal regions of East Africa, it was introduced to Guangdong, Guangxi, Yunnan, Fujian, Hainan, Taiwan, China and other places in China in the 1830s. Its hosts include impatiens and many other flowers, as well as vegetables and fruit trees. Its damage characteristics: it is an omnivorous pest, and young snails are mostly
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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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Identification and Control Methods of the Impatiens Hawk Moth
The scientific name of the impatiens hawk moth is Deilephila elpenor lewisil Butler. It is a major pest of impatiens and is distributed in Northeast, North, East and Northwest China. Besides impatiens, its host plants also include autumn orchids, herbaceous flowers and others. Damage characteristics: this insect feeds on leaves in the larval stage, affecting the growth and development of the plant, and is a major pest of impatiens. Morphological characteristics: the adult body length is 33-40 mm, and the wingspan is 55-70 mm. The wings and body are red
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