Zingiber officinale Rosc. ginger alias. Ginger is a perennial herb that is cultivated for one year and medicinal rhizomes. With stomach, cold, hair, detoxification function. Most areas are cultivated.
Symptoms mainly affect the leaves, and the spots are brown dots at the beginning. The lesions on both sides of the leaves expand into spindles and resemble the eyes. Therefore, they are called eye spots or eye spots. Grayish white lesions, light brown edges, size 5-103-4 (mm), yellow halo around the disease is obvious or insignificant, when the humidity is high, the lesions on both sides of the dark gray to black mold, that is, the conidia of the bacteria Stems and conidia.
The pathogen Crechslera spicifera (Bain) Arx is called Desmodilum, a fungus belonging to the subphylum Fungi. Conidia stems more than solitary, yellowish-brown, straight without branching, basal cells swollen, pale apical, spore-producing cells with multiple axillary buds, axillary elongation, conidia oblong, blunt at both ends, Solitary or apical, straight, pale yellow, with 2-7 membranes, size 22-538-14 (Ftm).
Transmission Pathways and Pathogenic Conditions The pathogens live over winter as conidial plexuses survive with the diseased body. The initial infection and reinfestation of conidia were carried out by rain and rain. Warm and humid weather is favorable to the occurrence of the disease, low-lying and high-humidity planting, fertilizer is insufficient, especially potassium is less, plant growth bad disease.
Control methods (1) Strengthen fertilizer and water management. The application of enzyme composted compost or decomposed organic manure, increased application of phosphorus and potassium fertilizers, especially potassium fertilizers, drainage ditch cleaning to reduce the humidity in the field, improve plant resistance. (2) Chemical control can be combined with other ginger leaf spot prevention and treatment. Serious disease or field can be sprayed with 30% basic copper sulfate colloidal suspension 300 times or 30% copper oxychloride suspension 600 times, 77% can kill wettable powder 600 times, 50% grammar emulsion 800 times liquid, 50% fast WP 1500 times liquid.
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