Identification and control of black velvet beetle
Black plush gold electronic common name blind bangzi, plush mandarin coat. The main harm to soybean seedlings by adults (gold electrons), bite the growth point or break the young stem, serious occurrence can eat up the seedlings to cause lack of seedlings broken strips, or even destroy the ground. This insect occurs one generation a year, overwintering as adults in the soil, and more in bean stubble. Feed on weeds from late April to early May, and bite soybean seedlings after emergence. The insect lurks in the soil at night and harms it during the day. Feeding is the highest at 3-5 p.m., and the number of insects is the largest in warm weather when there is no wind.
Control method: 2.5% trichlorfon powder can be sprayed, 2 kg per 667 square meters. Or use 2.5% enemy kill, 5% Laifuling, 2.5% kungfu and other agents, 15-20 ml per 667 square meters, about 40 kg of water, spray.
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The disease of the soft-shelled turtle.
Soft-shelled turtles are timid, afraid of people, afraid of the cold, like drilling mud, like basking in the sun. Once sick, its behavior is abnormal, it no longer drilling mud and sun back, like to hide in a shady and dry place, move slowly, not afraid of people. According to these characteristics, problems can be found as soon as possible, which is beneficial to the prevention and treatment of soft-shelled turtle disease. In the pond where there is no habitat of diseased soft-shelled turtle, once the soft-shelled turtle gets sick, it is difficult to detect and often delay treatment. Once it comes to the surface, it is terminally ill and cannot be saved. Healthy soft-shelled turtles move quickly, as long as they find
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Fish species are released in autumn to ensure survival in autumn.
Strengthening the cultivation of fish species in autumn is the key to improve the survival rate of overwintering fish species. Improve the environment before the release of fish species, release half of the original pond water, and then add new water. 150 kg fermented manure was applied per mu pond, once every 9 days, for a total of 3-5 times. Appropriate topdressing of chemical fertilizers based on nitrogen and phosphorus, generally 1.5-2.5 kg of urea and 3-5 kg of superphosphate per mu of pond, about once every 7 days. Add fresh water after each fertilization to keep the transparency of the pool water at 20-30 cm. Use quicklime 10 per mu of water every half a month
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