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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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What to Do When Impatiens Gets Mosaic Disease? A Detailed Guide to Prevention and Control Methods
Symptoms The disease occurs at the root crown. At first the root crown turns brown and constricts, later causing damping-off symptoms. Generally, in flower beds during the plum rain season, and when potted flowers are too wet, the disease occurs more frequently. Pathogen PhytophthoranicotianaevanBredadeHaanvar.parasitica(Dastur)Waterhouse Transmission routes and disease conditions The pathogen overwinters in seeds or as mycelium and oospores with diseased plant debris in the soil, and spreads through wind
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Symptom Identification and Control Methods of Impatiens Green Petal Disease
Also known as balsam green-change disease, it is sporadically distributed in Jiangsu, Anhui, Hebei, Beijing and other places. It mainly damages the floral organs of Impatiens balsamina (garden balsam), causing them to lose their normal ornamental value. Symptoms: affected plants mainly show flowers turning into leaves, that is, the petals change from normal pink to green, slender like leaves; some petals become leaf-like, retaining only a small amount of red. New plants of the current year show symptoms after blooming. In the high-temperature summer season, the flowering period is shorter than normal, and the inner petals of the corolla quickly turn brown, die and fall off. Under the same cultivation and management conditions, diseased plants are shorter than healthy plants, and the leaves often curl upward from the edges, not
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How to prevent and control garden balsam ring spot disease? A detailed guide to practical methods
Symptoms The disease occurs on leaves. Large round lesions with dark brown edges form. The surface of the lesions shows distinct concentric rings. In the later stage, the center of the lesion turns grayish brown, with scattered small black dots. Pathogen: Ascochyta phaseolorum Saccardo, belonging to the genus Ascochyta, subphylum Deuteromycotina. Transmission route: The pathogen overwinters and oversummers on diseased plant debris as pycnidia and perithecia. Conidia can spread via wind and rain. Conidia produced on later lesions continue to spread and cause secondary infections.
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Control Methods for Japanese Wax Scale Infestation on Boxwood
One generation occurs per year, with fertilized female adults overwintering on twigs and shoots. Morphological characteristics: female adult, wax shell grayish white or slightly flesh-red, oval. Male adult, body dark brown or brown, head and thoracic dorsal plate darker. Nymph, wax shell ovate to elliptical, dorsum slightly raised. Control methods: (1) Quarantine measures: when purchasing seedlings from other locations, plant quarantine procedures must be strictly implemented to prevent artificial spread of the pest. (2) Strengthen garden maintenance and management: through maintenance and management, create environmental conditions unsuitable for scale insect survival. Implement crop rotation, clean up the garden promptly
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What are the control methods for the box tree moth (Glyphodes perspectalis)?
Lepidoptera, Pyralidae (snout moths). It is one of the leaf-eating pests on hedge plants such as Japanese boxwood (Buxus microphylla) and Chinese boxwood (Buxus sinica). It mainly damages the top shoots and leaves of hedge plants, causing bare branches and leaves, greatly reducing their greening and ornamental value. In recent years, the damage has been increasing year by year across the country. Distribution and damage: distributed in Sichuan, Guizhou, Hubei, Hunan, Guangdong, Fujian, Jiangxi, Zhejiang, Shanghai, Jiangsu, Shandong, Hebei, Shaanxi, Qinghai, and Xizang; it damages boxwood (Buxus), Chinese boxwood, box-leaf euonymus (Buxus bodinieri), holly (Ilex), and winged euonymus (Euonymus). The larvae spin silk to bind leaves together into nests and feed on
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