Now in the peak season of pesticide use, the use of pesticides should follow the principles of effectiveness, economy and safety. What should be paid attention to when spraying pesticides on rice?
The right medicine: according to the type of disease, insects, weeds, the choice of pesticides.
Appropriate amount of medication: The right amount is the dosage or dilution factor per unit area, not too much or too little.
Timely medication: According to the forecast and the situation of pests and diseases in the field, choose the medicine that is most conducive to the eradication of pests and diseases, not too early or too late.
Reasonable mixing and alternating use of pesticides: Choosing the right mixture of pesticides can improve the control effect, and prevent and control two or more pests at the same time. A pesticide should not be used alone for a long time, and should be used alternately with Other pesticides with substantially the same effect.
Pay attention to the application method: such as controlling rice blast, you can apply the medicine around the field first, then apply the medicine to the field; control the rice planthopper, the medicinal agent should be applied to the lower part of the rice plant; for the control of the rice leaf roller, the ordinary spray The effect is better.
Strictly divide the control objects: According to the rice seedling situation and the occurrence of pests in the field, divide the control object field, and focus on the prevention and control of the heavier pests and diseases, and do not engage in "one size fits all".
Grasp the application time
In order to improve the efficiency of the use of pesticides, it is necessary to pay attention to the opportunity to increase the pests' food and medicine and to touch the medicines in order to obtain the best application effect. Many farmers' friends often spray pesticides at high temperatures at noon, which is very harmful. Because of the strong light at noon, the pests hide in the back of the leaves and the stems and fruits of the plants; the midday liquid is easy to decompose and volatilize, so the insecticidal effect is poor. Another noteworthy problem is that pesticides are also very harmful to people at this time, and many pesticide poisonings occur mostly during this period.
The optimal spraying time of crops refers to the time period recommended by the agricultural technicians on the basis of forecasting and forecasting of pests and diseases in the agricultural technology sector. Generally, the weather on sunny days and cloudy days is best from 8 am to 10 pm and around 5 pm. This is because the dew is only about 9:00 am, the temperature is not too high, it is the time when the sunrise pests feed and live the most vigorously. At this time, the medicine will not be diluted by the dew, nor will it be caused by the temperature being too high. The decomposition of the drug solution can reduce the efficacy of the drug, but it can increase the chance of the herbivorous pests to take medicine and touch the medicine; after 4 pm, the sun is westward, the light is weakening, and the night-borne pests are about to start activities. The pests come out to eat at dusk and at night, which can be effectively killed.
Pay special attention to local weather information during the rainy weather. In addition to watching (listening to) local meteorological information, it is also necessary to pay attention to communication with local meteorological technicians, grasp the weather conditions, and avoid rainy days.
There is another problem that needs to be paid attention to when spraying rice. It is necessary to avoid the time of rice flowering when spraying. Rice flower organs (mainly anthers and pollen) are very sensitive to environmental reactions, and drugs have certain effects on pollen. When the concentration exceeds the tolerance of the pollen, it will affect the seed setting rate.
More pesticide knowledge, please pay attention to China Pesticide Network
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