Medicinal plant drugs chrysanthemum wilt

At the onset of symptoms, the leaf color became light yellow, wilting drooping, and the base of the stem became light brown. The vascular bundle became brown at the base of the transverse stem. The vascular bundle that expanded upwards gradually became light brown, causing downward spreading. The roots of the roots are necrotic or black and rot, and some stems are cracked. When the humidity is high, it produces white mold, which is the pathogen mycelium and conidia. The disease is slow to spread, and some plants have yellowing, wilting or rot.

The pathogen Fusarium oxysporum Schl.f.sp. chrysanthemi Snyder et Hansen called the Fusarium oxysporum chrysanthemum specialized type, belonging to the fungus Aspergillus Suberii. On the PDA medium, the aerial mycelium was lush and flocculent, and the back of the flora was light purple to purple and individual white. Large conidiospores are spindle-shaped or sickle-shaped, thin-walled, pointed at both ends, more with 3 diaphragms, a few 4 or 5, and 3 diaphragms 25-363.6-4.7 (μm) in size; Spores are born on single-stem or shorter conidial stalks, many in number, kidney-shaped to elliptic, l-2 cells, size 6-142.7-3.6 (μm); thick-walled spores spherical to Oval, 1-2 cells, terminal or mesogenic; solitary or twin, individual string.

Transmission pathways and onset conditions mainly occur in the winter when the chlamydospore is in the soil, or it takes a longer period of saprophytic life. In the field, it spreads mainly through irrigation water, and it can also be blown away with the sick soil. Germ development temperature 24-28 °C, the highest 37 °C, the lowest 17 °C. The fungus only damages the chrysanthemum, and it is a dead plant within 2 weeks of the disease condition. Humidity or waterlogging fields are prone to disease, especially after the rain water, high temperature and rain, excessive nitrogen fertilizer, soil acidity and easy incidence.

Control methods (1) Promote the use of compost or fermented organic fertilizers made from fermented bacteria. (2) Strengthen field management and rotation with other crops; select suitable local disease-resistant varieties; select suitable sandy soil for drainage; rational irrigation, strengthen management of planted ditches to avoid excessive moisture in the fields or accumulation of water after rain. (3) Spray 50% carbendazim WP 500 times or 40% polysulfide suspension 600 times, 50% ceric chloride copper wettable powder 400 times, 30% basic copper sulphate suspension 400 times liquid irrigation, each strain of the above-mentioned good liquid 0.4 ~ 0.5L, depending on the condition continuous irrigation 2-3 times.

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