The Latest Technical Methods and Tutorial for Lotus Root Pest and Disease Control

Lotus root is one of the aquatic vegetable crops with relatively high economic value in China. In recent years, as market demand has continued to grow, the lotus root planting area has expanded year by year and has become a pillar industry in many places. However, the massive outbreak of lotus root pests and diseases has seriously affected the industrial development of lotus root production in various regions. Now let us take a look at lotus root pest and disease control techniques!

Lotus Root Brown Spot Disease

[Disease characteristics] A common disease on lotus leaves, producing light brown spots on the leaves and causing localized drying of diseased leaves.

[Control methods] Plant at a reasonable density to ensure ventilation and light penetration in the lotus field; appropriately increase the application of phosphorus and potassium fertilizers to improve plant resistance, and promptly remove diseased plant residues. In the early stage of the disease, spray with 25% carbendazim 600 times dilution, or 75% chlorothalonil 1000 times dilution.

Lotus Root Black Spot Disease

[Disease characteristics] Lotus root black spot disease, also known as brown streak disease, occurs only on leaves. In severe cases, the spots merge and the leaves turn yellow and withered.

[Control methods] In winter, thoroughly remove diseased and residual leaves from the field and burn them in a centralized manner. In the early stage of the disease, remove diseased leaves and spray for control. Commonly used treatments include 70% thiophanate-methyl 1000 times dilution, or 65% zineb 600 times dilution, or 1:1:160-200 Bordeaux mixture, sprayed once every 10-15 days for a total of 2-3 sprays.

Lotus Root Rot Disease

[Disease characteristics] Lotus root rot disease, also known as wilt disease, infects the underground stem and causes it to rot. In severe cases, the entire field turns yellow and withered, as if scorched by fire.

[Control methods] Practice 2-3 year crop rotation in seriously affected fields. Commonly, use 70% thiophanate-methyl 1000 times dilution or 75% chlorothalonil 800 times dilution to spray and fumigate the seed, cover with agricultural film and seal for 24 hours, then dry and plant. Deep plow the lotus field and apply 150 kg of lime per mu. When the disease occurs, mix 0.5 kg of 75% chlorothalonil with 30 kg of dry soil and spread it evenly into the shallow-water field.

Lotus Root Stripe Virus Disease

[Disease characteristics] After infection, symptoms can appear on both lotus leaves and underground rhizomes. Large polygonal to irregular light brown necrotic spots appear on the leaves, and dark brown anthracnose stripe spots appear on the rhizome epidermis.

[Control methods] Select disease-resistant varieties, promptly control aphids (the virus transmission vector), and in the early stage of the disease spray 1.5% plant virus inhibitor emulsion 1000 times dilution.

Lotus Leaf Wilt Disease

[Disease characteristics] Affected lotus leaves turn scorched yellow and wilt, affecting lotus root growth and causing reduced yield.

[Control methods] Keep the lotus field clean and prevent oil pollution from contaminating the lotus field. Sewage and soapy water can also cause lotus leaves to wilt and die. Lotus root is highly sensitive to herbicides, and herbicides must never be applied in lotus fields.

Pest Control

[Damage characteristics] There are aphids, large bagworms, pear green stinging moths, and brown stinging moths, which damage standing leaves and flower buds. Water maggots suck the sap of lotus roots, stems, and leaves, causing lotus leaves to turn yellow.

[Control methods] Spray with 90% trichlorfon 800-1000 times dilution, or 40% dimethoate 2000 times dilution. Once water maggots are found, lime can be applied to repel and kill them, at 10-15 kg per mu.