Occurrence and control of black velvet beetles in Fengxiang County, Shaanxi Province
Black plush beetle (commonly known as mole tiger), body length 7-8 mm, body color black brown or purple brown, body surface has dark brown villi. It occurs one generation a year, overwinters as adults, unearthed in April of the following year, and then feeds on the leaves of weeds, poplars, willows and elms. After the crop seedlings are unearthed, they migrate to sunflowers, legumes and other crops to feed. Lurking in weeds and soil crevices during the day. More than flying out of the cluster in the evening, eating willow, elm, young leaves of fruit trees, alfalfa and sunflowers, sweet potatoes, potatoes, beans and other crop seedlings. Adults have pseudo-death and phototaxis. Adults lay eggs from May to July. After the eggs are hatched into larval grubs, they continue to bite the underground roots and stems of the crops.
Prevention and control measures:
The main results are as follows: 1. Artificial hunting and killing: making use of the false death habits of adult pests, the masses are mobilized to kill adults by vibrating and falling method at dusk, which is carried out continuously in a large area.
2. Light trapping: use the phototaxis of pests at night, light or insecticidal lamp to trap and kill.
3. Poison bait: black velvet beetles appear most in warm and windless weather, and generally fly out at 6-10:00 after sunset in the afternoon. Making use of the habit of eating the branches and leaves of elm, willow and poplar, the branches of poplar and willow can be sprayed and dipped in 80% trichlorfon 100 times liquid in the evening, and then scattered in the field to trap and kill its adults.
4. Poisonous soil contact killing: the ground is sprinkled with enemy horse powder or armour enemy powder, and then the shallow hoe is mixed with the soil, and the pest can be killed when it is lurking into the soil.
5. Spray control: the following pesticides are selected on the damaged crops for foliar and surface spray control. 40% phoxim 2000 times, 4.5% cypermethrin 2000 times, 4.5% ladyfish EC 1500 times, 1.8% avermectin 2000 times.
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Several common green environmental protection fishery drugs
Although quicklime and salt are not special fishery drugs, they have good effect in preventing and controlling aquatic diseases, and do not pose a threat to the environment, and there is no drug residue problem. Sprinkling quicklime regularly into aquaculture water can not only reduce the occurrence of various diseases, but also provide calcium essential for aquaculture organisms, especially for crustacean aquaculture. Use method: select unweathered quicklime, clear pond disinfection with 150 - 200 kg per mu; disease control generally 5 - 9, 20 days or so once, water depth 1
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Preparation of bait for fish
The treatment and prevention of fish disease is generally used to sprinkle medicine in the pond and mix the medicine in the feed for feeding, which is what we usually call oral method. The key to the effect of oral treatment and prevention of fish disease lies in the preparation of bait. The preparation methods and matters needing attention of several baits commonly used in production practice are introduced as follows: first, the preparation methods of several baits. Preparation of pellet feed bait: calculate the required feed and medicine, spread the feed evenly on the plastic film (thickness should be uniform, not
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