Prevention and control of spot disease of impatiens
First, damage symptoms: disease scientific name: PhyllostictaimpatientisFautr. Impatiens spot disease is mainly harmful to leaves. Primary yellow spots, gradually expanding around into a round spot, the size of 2~5mm. The center of the post-plaque is light brown or grayish white, the edge is brown slightly raised,-dead black particles, that is, the pathogen conidium. If the bacteria invade from the leaf tip or leaf edge, the leaf tip will die and the leaf edge will be anxious. The disease occurred in Guangdong and Yunnan from July to September.
Second, the morphological characteristics of the pathogen: the pathogen is called impatiens leaf spot mold, which belongs to half-known fungi. The conidium is scattered on the leaf surface, globose to subglobose, 82-102um in size. The conidia are oval, colorless and contain 1-2 oil globules, the size of 3.0-5.0X2.0-3.0 (um).
Third, the characteristics of the disease: the pathogen overwintered on the diseased body with conidia, and when the conditions were suitable in the next year, conidia were transmitted by airflow and Rain Water to carry out primary infection and re-infection.
IV. Prevention and control methods
(1) timely removal of diseased fallen leaves.
(2) if necessary, spray 40% chlorothalonil suspension 500 times or 80% spray gram wettable powder 600 times, 70% mancozeb wettable powder 500 times.
Commonly used agents: 70% mancozeb wettable powder 40% chlorothalonil suspension
6. The latest special effect agents: Pectinomyces amicidarbazim, etc.
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White silk disease of impatiens
Impatiens white silk disease harms plant roots and fruits, causing quenching, root rot, base rot and fruit rot. The disease can harm Iris, orchid, peony, peach, plum and other plants. Symptoms: at the initial stage of the disease, brown-black wet rot occurred at the base of the susceptible plant, followed by white silk mycelium and sclerotia the size of rapeseed. In the later stage of the disease, the seriously susceptible plants were stunted. Pathogen: the pathogen is SclerotiumrolfsiiSacc., which belongs to half-known bacteria.
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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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