Prevention and control of beetles
The beetle, commonly known as "Cang insect", is a generation every year, which mainly harms poplar, willow and other plants, larvae harm roots and adults feed on leaves. According to the investigation and statistics of the Forestry Bureau of our county, the harm of beetles accounts for a large proportion of flower and tree diseases and insect pests in our county.
Prevention and control methods:
1. Artificial control: make use of the false death of adults to vibrate branches in the evening to kill landing adults.
two。 Physical control: make use of the phototaxis of adults, hang black light to trap and kill adults at 7-10:00 in the evening.
3. Horticultural control: combined with winter ploughing, soil preparation, picking up larvae, pupae and adults.
4. Chemical control: during the adult damage period, spray 50% methamidophos 800-1000 times, or 50% phoxim 800-100 times, 40% omethoate emulsion 1000 times, spray every 2-3 days during the adult outbreak period, and spray continuously for 2-3 days. In this way, we can basically prevent the harm of beetles.
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Prevention of fulminant hemorrhagic disease in fish
In autumn, with the rapid growth of fish and the increase of pond culture density, the water quality is easy to deteriorate, and the reproduction speed of various pathogenic pathogens is accelerated, which easily leads to the occurrence of fulminant hemorrhagic disease. Preventive measures are as follows: 1. Before entering the pool, the seedlings must be disinfected by soaking in 1%-2% salt water. The soaking time depends on the constitution and temperature of the fish. When conditions permit, the fingerlings can be soaked with fulminant hemorrhagic vaccine. 2. Change water and oxygenation in time. Keep the water fresh and change it frequently. If the conditions limit the inconvenience of changing water, raw stone can be used.
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Disease and enemy damage of fish and its control methods
Cyanobacteria diseases: cyanobacteria, including Microcystis aeruginosa and Microcystis aeruginosa, generally occur in summer and early autumn, it likes to grow in high temperature and alkaline water, when the pH is 8-9.5, the water temperature is 28 ℃-32 ℃, the reproduction is the fastest. For example, when there are more than 500000 groups in a liter of water, the dissolved oxygen in the water is often insufficient for its needs, and a large number of people will die. After the death of the algae, the protein is easy to decompose and produce toxic substances such as hydroxylamine and hydrogen sulfide, which accumulate in the water, which can not only poison fish, but also cattle and sheep drink this.
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