Grasp the timing of the first insecticide
To have a good insecticide effect, the timing of pest killing is very important. The survey of the spring insecticide time in Central China in 2014 showed that the incidence of parasitic parasites in fish ponds before April 2 was 30%, and the incidence of parasitic parasites in fish ponds after April 10 was high. 100%.
Insecticide should use water temperature as a reference standard. When the water temperature rises to 18°C ​​to 20°C and the weather remains sunny for more than 3 consecutive days, the first insecticide can be carried out. According to previous years' experience, this time point is generally from late March to early April in the east China region, and generally mid-March in southern China.
In addition, in actual production, experienced farmers will decide when to kill insects based on weather and pond conditions. In Central China, before and after Ching Ming every year, when you take off your coat and wear a single piece of clothing, you need to kill insects. Or look at the pond and see the fish “flock†when they eat; there are fish jumping on the surface of the water, stirring the water on the shore or scampering, and the body spinning out of balance; at night you hear the sound of the fish slamming the water; the weather In normal times, the amount of grass eaten by the fish suddenly drops; the white stork tails, etc.; when you see these phenomena, you need to start killing insects.
Disinfect after killing insects
Many farmers attach great importance to insecticide. As a result, although insect pests are good, fish disease has quickly returned. Why? One of the very important reasons is that there is no disinfection after insecticide, because these insects are mainly parasitized on cockroaches. Although the insects are killed, cockroaches have already suffered certain damage. At this time, the bacteria just took advantage of it, and it is easy to cause bacterial rotting. Or physiological hypoxia leads to death. Therefore, it must be disinfected after killing insects;
It is recommended that the whole pool be disinfected with povidone iodine (10%, 500 ml, a bottle of 1.5 mu - 2 mu of water) on the second day after the second insecticide, and the best disinfection is on a sunny morning. The effect is good, the medicine is mild, and the volatilization is quick. After use, the aerator is started.
Tonic insects when cloudy and sunny
Many households kill insects, but after continuous rainy days, when the weather turns fine, parasites can also occur. This is because of changes in the weather. Water temperature changes cause convection in the upper and lower aquifers, and parasite eggs that carry the bottom of the pond enter the water body. Incubation; pan-bottoms, algae growth, resulting in an increase in organic matter, providing a carrier for propagation of parasites; large temperature differences, large fish stress, susceptible to pathogens. Therefore, it is necessary to make up and kill the insect once it is sunny and sunny.
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