Medicinal plant Elaeagnus meleaiana
The scientific name of Ginseng is Glehnia littoralis Fr. Schmidt ex Miq. Synonyms Phel10pterus littoralis Benth. Alias ​​coral vegetable, Umbelliferae, rooted medicine. There is nourishing yin and clearing the lungs, and the effect of relieving cough and phlegm. Distributed in Shandong, Hebei, Liaoning and other provinces.
Symptoms The lesions on the leaves are round, brown, 3–6 mm in diameter, with black moldy, the fruiting body of the pathogen. The disease usually occurs in April-May.
The pathogen Alternaria petroselini (Neergaard) Simmons belongs to the fungus Aspergillus spp. Conidiophores solitary or 2-3 clustered, pale brown, 60-806-8 (μm); conidia punctate, solitary, broadly elliptic, reflexed, yellow-brown, smooth surface, 2 A 9 diaphragm, 2 - 8 longitudinal diaphragm, contracture at the diaphragm, spleen 35 - 10518 - 3 (μm), mouth shorter, width 6 - 9 μm.
Transmission Pathways and Pathogenic Conditions Bacteria live on diseased leaves with hyphae or conidia, and are the primary source of infection for the year. In addition, hyphae are also present in the germinal tissue of the diseased seed, which invades the root when the seed germinates. The disease onset temperature 25 °C, the highest 40 °C, the lowest 15 °C.
Prevention methods (1) Large-scale crop rotation, prompt drying of land after harvest, clean gardens, and reduction of field bacteria sources. (2) Strengthen management and improve host disease resistance. (3) Seed disinfection. The seed weight was 0.3% of 50% thiram WP or 75% chlorothalonil wettable powder, 50% acetaminophen wettable powder dressing. (4) Chemical control. The effective fungicides against Alternaria alternata caused by Alternaria are: 75% chlorothalonil wettable powder 500-600 times, 50% acetaminophen wettable powder 1000 times, 50% fast-inking wettable powder 1500 times liquid, 58% metalaxyl MnZn WP 500 times, 64% WP 50 times.
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