What pesticide is best for controlling diseases and pests in lotus root?

Lotus root has very high edible value and medicinal value, but diseases and pests are unavoidable during the planting process. When diseases and pests appear, what pesticide is best for controlling them?

1. What pesticide to use for lotus root

Different diseases and pests require different pesticides and dosages. The main diseases of lotus root are: rot disease, leaf blight, and leaf spot disease. So how should these several diseases be controlled?

Before planting, use a 1000-fold dilution of 70% thiophanate-methyl or an 800-fold dilution of 75% chlorothalonil for spray treatment and airtight seed holding, cover with agricultural film and seal for 24 hours, then dry and plant. In the early stage of disease onset, use 0.5 kg of 75% chlorothalonil and 0.5 kg of 65% zineb, add 30 kg of soil, mix well, and scatter into the shallow-water field; use a 1000-fold dilution of 70% thiophanate-methyl, a 600-fold dilution of 65% zineb, or 1:1:160-200 Bordeaux mixture for spray control, generally spraying once every 10-5 days, for 2-3 consecutive sprays.

First, lotus root leaf spot disease mainly damages the leaves, and can sometimes also occur on the leaf stalks. It is caused by pathogenic fungi of the genus Isariopsis.

Second, lotus root rot disease, also known as black root disease or lotus root plague, is a major disease in lotus root production. It is generally more likely to occur in old lotus root fields with shallow plough layers and shallow water and in continuous cropping fields, affecting lotus root formation and reducing yield. It is a lotus root disease caused by infection by the corm-like Fusarium fungus, mainly damaging the underground stems, aboveground leaves, and leaf surfaces.

Third, lotus root leaf blight is the second major disease of lotus root, and the pathogen is a pathogenic fungus of the genus Sphaerotheca. It mainly damages lotus leaves. Pale yellow lesions first appear at the edges of the lotus leaves, then gradually spread toward the middle of the leaf, appearing yellowish brown, and finally spread from the leaf mesophyll to the leaf veins until the entire leaf dies. High temperature and frequent rain favor disease occurrence, and insufficient fertility in the lotus root field makes the disease severe.