Hylocereus undatus (Haw.) Britt. Et Rose alias Jianhua, Overlord flower. Medicinal flowers. Color version 2011601 symptoms mainly affect the stem. At the beginning of the stem section, pale yellow to yellow-brown water-stained amorphous chlorotic spots appear. The sick and healthy segments are not obvious, the lesions turn red-brown after the lesions expand, the affected area gradually softens and decays, leaving only a layer of dry skin or only Stalk and marrow, and eventually the whole plant decay withered, with rapid decay of the stem sections near the ground, and when the humidity is high, the diseased part can be pink moldy material, namely conidium plexus and conidia.
The pathogen Fusarium oxysporum Schlecht. called Fusarium oxysporum, is a fungus of Deuteromycotina. The conidial stems were clustered, with pod-like branches, and the top of the branches were round-shaped bottle-shaped pedicels with conidia growing on them. Conidia are of two types: megasporate, sickle-shaped, colorless, with 3-5 septa, mostly 3 septa, size 19-502.5-5 (μm); microspores ovate to reniform, simple Cells or twins, colorless, size 5-262-4.5 (μm). The bacteria can produce thick-walled spores, endogenous or metaplastic, spherical, wall thickness, diameter 5-15μm.
Transmission routes and onset conditions: Mycelium and chlamydospore are overwintering on diseased bodies in affected tissues or fallen soils. Conidia are produced in the following year. They are transmitted through rain spattering, and they invade the wounds and cause diseases. Conidia are produced for reinfection. In early spring and early summer, the weather is favorable for the onset of cold weather. Planting low-lying water, high moisture in the field, damage to the stems and knots, or applying miscellaneous fertilizers that are not fully mature will increase the incidence.
Prevention methods (1) Increase the application of phosphorus and potassium fertilizers to avoid the application of soil decomposition fertilizers that are not fully decomposed. (2) Dig up diseased stem sections in time to completely remove the sick and burn them. (3) Minor disease stem sections can be used to dig out the meat disease department, incision smear 50% carbendazim or 25% benzene to wet WP 100 times or 40% polysulfide suspension 100 times. (4) At the beginning of the disease, spray 10% double-effect Lingshui agent 300 times or 65% Dukesson WP 800 times, 50% carbendazim WP 600 times. According to the condition of disease prevention and control around l0 days 1 time, a total of 2-3 times prevention and treatment.
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