Lotus roots are planted in many places. During the cultivation of lotus roots, the disease control of lotus roots has always been a key issue for growers. Today, we will introduce the prevention and control methods of common pests and diseases of lotus roots.
First, lotus root brown spot disease. A common disease in the lotus leaf, producing pale brown lesions on the leaves, causing the diseased leaves to dry out. Prevention and control: Reasonable close planting to ensure ventilation and light transmission in Putian; appropriate application of phosphorus and potassium fertilizer to improve plant resistance and timely removal of diseased plant residues. In the early stage of the disease, spray with 25% carbendazim 600 times solution or 75% chlorothalonil 1000 times solution.
Second, lotus root black spot disease. Also known as brown streak disease, only occurs on the leaves, in severe cases, the lesions meet, the leaves are yellow. Prevention: In the winter, the diseased leaves are completely removed and burned intensively. At the beginning of the disease, the diseased leaves were removed and sprayed. Commonly used 70% methyl thiophanate 1000 times solution, or 65% sensitized zinc 600 times solution, or 1:1: 160-200 times Bordeaux mixture, spray once every 10-15 days, a total of 2-3 times.
Third, lotus root corruption. Also known as blight, infested the underground stems to cause rot, when the whole field is a yellow, burning like a fire. Prevention and control: 2-3 years of rotation in heavy disease fields. Commonly used 70% methyl thiophanate 1000 times solution or 75% chlorothalonil 800 times solution spray stagnation, cover the agricultural film sealed for 24 hours, dry and plant. Deeply turn over the fields and apply 150 kg of lime. At the time of onset, 75% chlorothalonil 0.5 kg and dry soil 30 kg can be mixed and sprinkled into shallow water fields.
Fourth, lotus root spot virus disease. Symptoms can be expressed on the lotus leaves and underground rhizomes after the damage. The leaves produce large polygons to irregular hazel, and the roots of the roots produce dark brown anthrax streaks. Control: Select disease-resistant varieties, timely control aphids (transfer media), spray 1.5% phytopathogenic emulsion 1000 times solution at the beginning of the disease.
Five, lotus leaf blight. The damaged lotus leaf is yellowed and withered, affecting the growth of lotus root, resulting in reduced yield. Prevention: Keep the fields clean and prevent oil from contaminating the fields. Sewage and soapy water can also cause the leaves to wither and die. Lotus root is very sensitive to herbicides, and weeds must not be applied to herbicides.
Six, common pests and diseases. There are aphids, giant moths, pear green moths, brown moths, damaging the leaves and flower buds. It can be sprayed with 90% trichlorfon 800-1000 times solution or 40% dimethoate 2000 times solution. The water sucks the juice of the roots, stems and leaves of the lotus root, which causes the lotus leaves to turn yellow. Once found, it can be smashed by lime, and the amount of the mu is 10-15 kg.
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