Control of soybean mosaic disease

1) selection of resistant varieties: different soybean varieties have different resistance to soybean mosaic disease, so selecting suitable local resistant varieties is the most effective measure to control soybean mosaic disease. The resistant varieties are Qihuang 22, Ludou 4, Ludou 1, Ludou 7, Ludou 6, he 84MUE 2, he 7308Mel 1MUE 2, Han 87, Yanhuang 3 and so on. These varieties have obvious yield-increasing effect and can be selected according to local conditions.

2) select seeds, eliminate diseased seedlings in the field: leave seeds with healthy plants in the seed field, and combine with the control of aphids to breed disease-free seeds. In general, brown spots should be removed before sowing in order to reduce seed-borne pathogens and reduce the source of infection of field diseases.

3) aphid control and disease prevention: controlling aphids before flowering, especially at the seedling stage, can reduce the further spread of virus diseases in the field. The common methods are as follows: before ① sowing, apply 3% Kuailudan granule 2kg per mu of ditch, cover the soil and sow again to avoid contact between seeds and pesticides. At seedling stage or adult stage, ② can be sprayed with 40% omethoate EC 1000 × 2000 times or 5% Lefuling EC 2000 times, or 20% fenvalerate EC or 2.5% dimethrin EC 3000 times, spraying 40 kg / mu.