Symptoms: Lotus leaf blight is mainly harmful to vertical leaves, and floating leaves can also be infected. At the onset of the disease, the leaves develop chlorotic spots, and the lesions gradually enlarge afterwards. The surrounding tissues are necrotic and dry, turning into light brown to dark brown. There are fine or inconspicuous rim-like large lesions on the floating leaves, which cause the leaf margin tissues to die. In the later stage of disease, scattered small black particles on the lesions are the conidia of pathogenic bacteria.
Incidence pattern: The pathogenic bacteria wintered on the diseased leaf with a conidial device. In the spring of the following year, conidia are produced and the conidia spread by wind and rain to infect. High temperature and humidity are conducive to disease, and the incidence of the disease is the heaviest in the rainy season. The lotus plants planted in different containers had more obvious differences in the degree of disease. Cylinder planting than the pool of lotus disease incidence. Small cylinder planters are heavier. From the late flowering stage to the fruiting stage, the disease spreads quickly. In severe cases, the blades will fade early and yellow.
Control methods: (1) Reduce the source of infection: The diseased leaves are completely removed in the winter and the destruction is concentrated. 2 to strengthen the cultivation and management: increase soil fertility and increase resistance to disease. 3 chemical control: the onset period, with 25% carbendazim WP 300 times, plus 0.1% flat plus spray, spray once every 7-10 days. In heavily affected areas, regular spraying is required.
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