Impatiens green petal disease
Also known as henna green disease, Jiangsu, Anhui, Hebei, Beijing and other places sporadic distribution. It mainly harms the flower apparatus of impatiens, making it lose its normal ornamental value.
Symptom-affected plants are mainly characterized by the change of flowers to leaves, that is, petals change from normal pink to green, slender like leaves; some petals become leaf-like, leaving only a small amount of red. The new plant showed symptoms after flowering in that year. In the high temperature season in summer, the flowering period is shorter than normal, and the petals in the inner layer of Corolla turn brown, die and fall off quickly. Under the same cultivation and management conditions, the diseased plant is shorter than the healthy plant, the leaves are often rolled up from the edge, not spreading; there are more branchlets and smaller leaves.
The pathogen of the disease was plant mycoplasma. Sporadic distribution in the flower bed, often typical symptoms and transitional symptoms appear at the same time. Impatiens is an annual herbaceous flower, seed reproduction, the new plant shows symptoms after flowering, whether it is seed disease, to be determined.
Prevention and cure method
(1) strengthen quarantine, destroy diseased plants and prevent spread.
(2) the flowers of diseased plants change into leaves, so they have special ornamental value, and the scope should be controlled if they are cultivated as horticultural varieties.
- Prev
Occurrence of blight of impatiens
Balsamine blight is common in China, and it is a common disease in impatiens cultivation. The disease mainly infects the root and stem. After the symptom rhizome was damaged, there was black constriction, and there was white mildew in the disease part when the environment was humid. The pathogen spread rapidly and occurred seriously, which led to the wilting and drying up of the upper leaves within a few days, and the whole plant died in serious cases. The pathogen RhizoctoniasolaniKuhn is called Rhizoctonia solanacearum, which belongs to the subphylum of semiknowns. The strain does not produce spores, and the hyphae grow for a certain time to interweave to form sclerotia.
- Next
Prevention and treatment of Impatiens Ring Disease
The disease occurs on the symptomatic lobe. Produce large round spots with dark brown periphery. There are obvious concentric wheel lines on the surface of the lesion. In the later stage, the middle part of the lesion turned grayish brown and scattered with small black spots. AscochytaphaseolorumSaccardo, a half-known pathogen. In the route of transmission, the pathogens overwintered and oversummer on the diseased remains by conidia and ascomycetes. Conidia can be transmitted by wind and rain. Later, conidia were produced on the disease spot and continued to spread, causing re-infection.
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