Black spot of Impatiens balsamina
[symptoms]
The lesion of the damaged leaves is round, oval, dark brown, slightly wheeled, 2mm in diameter and slightly darker at the edge. Some disease spots can expand and connect into pieces, overgrowth of light green or olive black mildew, that is, the conidiophores and conidia of the pathogen. The old leaves in the middle and lower parts are easy to be infected, and in severe cases, the diseased leaves shrink and die.
[pathogen]
AlternariatenuisNees. It belongs to the subphylum of semi-knowns and Alternaria. Conidiophores erect, brown, flexion, apical disease often enlarged with spore scars, size 5-125um × 3-6um. Conidia chain, beaked, dark brown, 1-9 transverse septum, 0-6 mediastinum, 7-70.5um in size, 1-58.5um × 1.5-7.5um in beak.
[morbidity regularity]
The pathogen overwintered with mycelium on the remnant of the diseased plant, and when the conditions were suitable in the spring of the following year, conidia were produced to cause primary infection. A large number of conidia are produced on the new disease spot, which are spread by airflow and cause many times of re-infection. High humidity, rainy and re-dew are beneficial to the disease and epidemic. The peak period of the disease is from July to August in the northeast until the first and middle of September.
[prevention and control methods]
(1) remove the remains of diseased plants in nursery or potted plants, bury them deeply or burn them, reduce the amount of overwintering bacteria, dig deep into the soil or rotate with other flowers. Strengthen cultivation management, rational fertilization and irrigation, improve plant disease resistance. Remove the lower old and diseased leaves in time.
(2) spray 1% Bordeaux solution before onset, and spray 50% carbendazim or 50% topiramine wettable powder 800 / 1000 times or 50% carbendazim 800 times after onset.
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Propagation methods and cultivation management of Impatiens balsamina
Method of reproduction: reproduce with seeds. 1. It is appropriate to select and prepare soil with sufficient sunshine, moist soil, fertile, loose and well-drained soil. Apply basic fertilizer and prepare the land to make a border, a high border in the south and a flat bed in the north, with a width of 1.2 m. 2. The seed of the sowing method is small and has a long life, and the germination rate is still 79.7% when stored at room temperature for 3 years. Live, March in the South and April in the North. Row spacing 35cm, open the shallow trench of lcm, spread the seeds evenly into the ditch, cover the soil with a little suppression, and then water it. Post-broadcast protection
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Anthracnose of Impatiens
Shanghai, Hangzhou. [symptoms] both branches and leaves can occur, mainly on branches and leaves. At the initial stage of the disease, withered yellow or brown spots appeared on the leaf surface, and then gradually developed into round to nearly round, light brown to brown, with dark edges, not obvious wheel lines, and small black spots scattered on the disease spots; with the development of the disease, the adjacent disease spots are connected to form irregular large disease spots, which make the leaves shrink and wither, resulting in shedding. In wet weather, pink gel gushes from small black spots, which can occur from June to September, and sometimes cause blackening and decay on branches.
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