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Five technical measures to control soybean chafer
Black velvet beetle common name black bean worms, bumpers and so on. In addition to endangering soybeans, it also harms crops such as corn and peanuts. Mainly adults (scarabae) endanger soybean seedlings, bite growth points or cut off young stems, and when they are severe, they can eat up seedlings and cause seedling off. This worm occurs one generation in a year. It occurs when adults spend their winters in soil and pods occur. From the end of April to the first half of May, we feed on the weeds. After the emergence of soybeans, the soybeans are eaten. This worm is lurking in the soil at night and harms it during the day. At 3 to 5 pm in the afternoon, the most abundant food is eaten, and there is no more wind and warm weather. Control methods are as follows: 1. Dressing. Use 50 ml of 50% phoxim emulsion and apply 25 kg of seed dressing. 2. Can be sprayed with 2.5% trichlorfon powder, 2 kg per mu. Or use 2.5% enemy kill, 5% rifafurin, 2.5% kung fu and other agents, 15 to 20 ml per mu, about 40 kg of water spray. 3. The poplar hunted. The windless afternoon of 2 to 3 o'clock in the afternoon, the adults emerged in a flourishing period and were grouped into tree branches with 60 cm long poplar twigs. After soaking for 3 hours in 90% trichlorfon crystals, they were taken out and scattered in the fields. Trapping can achieve good control effect. 4. Blacklight trapping. By using the phototaxis of adults, a black light is installed in the head of the field at the time of adult emergence to trap large numbers of adult insects. 5. Toxic soil method. With 5% phoxim granules 2.5 to 3 kg per mu, add fine soil 15 to 20 kg and mix well, along the ridge spread around the seedling roots, application of 2 to 6 pm in the afternoon is appropriate.