The latest course on prevention and control of lotus root diseases and insect pests

Lotus root is one of the aquatic vegetable crops with high economic value in China. In recent years, with the increasing market demand, the planting area of lotus root has expanded year by year, and it has become a pillar industry in many places. However, the occurrence of a large number of lotus root diseases and insect pests has seriously affected the industrial development of lotus root production in various places. Let's take a look at lotus root pest control techniques.

Brown spot of lotus root

[disease characteristics] A common disease in the lotus leaf, which produces light brown spots on the leaves, causing local dryness of the diseased leaves.

[control methods] reasonable close planting to ensure ventilation and light in the lotus root field, proper application of phosphorus and potassium fertilizer to improve plant resistance and timely removal of diseased plant residues. Spray 25% carbendazim 600x solution or 75% chlorothalonil 1000 times solution at the initial stage of the disease.

Black spot of lotus root

[disease characteristics] the black spot of lotus root, also known as brown streak, occurs only on the leaves, when the disease spots converge and the leaves turn yellow.

[control methods] the diseased and residual leaves were thoroughly removed and burned in the field in winter. At the initial stage of the disease, the diseased leaves were removed and sprayed for prevention and treatment. Commonly used 70% methyl topiramate 1000 times solution, or 65% Dysen zinc 600 times solution, or 1 lug 1lux 160mur200 times Bordeaux solution, sprayed once every 10 mi 15 days, a total of 2 Mel 3 times.

Lotus root rot

[disease characteristics] Lotus root rot disease, also known as Fusarium wilt, infects the underground stem and causes rot. when it is serious, the whole field is withered and yellow, like burning.

[control methods] rotation of 2-3 years was carried out in seriously diseased fields. Commonly used 70% methyl topiramate 1000 times solution or 75% chlorothalonil 800x solution spray suffocation, cover agricultural film sealed for 24 hours, dry after planting. Turn the lotus root field deeply and apply 150 kilograms of lime per mu. When you get sick, you can mix 0.5 kg of 75% chlorothalonil and 30 kg of dry soil and sprinkle it into the shallow paddy field.

Lotus root streak virus disease

[characteristics of the disease] symptoms can be seen on the damaged lotus leaves and underground rhizomes, with large polygonal to irregular light brown spots on the leaves and dark brown anthrax spots on the rhizome epidermis.

[control methods] disease-resistant varieties were selected to control aphids (transmission vector) in time, and 1.5% Zhiyanling emulsion was sprayed 1000 times at the initial stage of the disease.

Lotus leaf wilt

[disease characteristics] the damaged lotus leaves were scorched and withered, which affected the growth of lotus root and reduced yield.

[prevention and control methods] keep the lotus root field clean and prevent oil pollution. Sewage and soapy water can also cause lotus leaves to wither and die. Lotus root is very sensitive to herbicides, and herbicides should never be applied in lotus root fields.

Pest control

[hazard characteristics] there are aphids, large coir moth, pear green moth, brown diamondback moth, harmful to standing leaves and flower buds. Water maggots suck the juice from the roots, stems and leaves of lotus roots, causing lotus leaves to turn yellow.

[control method] it can be sprayed with 90% trichlorfon 800ml 1000 times or 40% dimethoate 2000 times. Once found, water maggots can be killed with lime, with a dosage of 10 Mu and 15 kg per mu.