Black root disease is an important physiological disease of lotus root, which occurs in the planting areas. It usually loses 20%-30% after the onset of the disease, and serious land loss is about 80%.
[symptom]
The disease is mainly manifested in the stem section. After onset, the stem section is brownish to dark brown, and the latter is spoiled and cannot be eaten. The upwardly-pumped leaves are chlorotic between the initial veins, and later turn into brown or purple-brown, extending from the leaf margin inward and eventually causing the whole leaf to die.
[Cause]
Black root is mainly due to too late pressure green, high temperatures, the application of organic fertilizer is not ripe, so that physiological disorders occur in lotus root. Usually rice fields are changed to lotus roots, and the heat and disease are heavy in summer and autumn.
[Control methods]
1. Keep deep-water fields in winter and apply sufficient organic fertilizer.
2. Scientific management of water. It is advisable to use 37,500 kilograms per hectare of juglans, and not later than the fourth leaf extension period at the latest. It was found that the use of paddy fields after the dark root disease can reduce the incidence.
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