The timely use of pesticides can not only save pesticides, reduce costs, but also improve the control effect and reduce drug residues. When discriminating the proper application period of pesticides, we should think about the following aspects:
Choose the pest season. The period of emergence of pests can be the period of egg hatching, which can be the period of larval growth, or the period of adult growth. In which period, the best effect of drug control is determined, depending on the specific situation. In principle, it is necessary to control the living habits of pests, which is carried out when it is most vulnerable to killing and can effectively control damage. For example, in the control of armyworms, spraying at the peak of egg hatching, although the control effect on hatched larvae is good, it does not necessarily work for late hatching larvae, and when the larvae are at the peak of 2 to 3 years old, spraying the drug, one control Can solve pest problems. For example, when the cotton bollworm is controlled, the newly hatched larvae will be drilled into the bud bell in a short period of time. If the larva is used at the peak of 2 to 3 years old, the control effect is very poor, and the medicine is used at the peak of the egg hatching period. The control effect is very obvious. The same is true for rice aphids and Spodoptera litura.
Choose the sensitive period of natural enemies. In the period when the natural enemies of the pests are sensitive to the chemical reaction, the medicine should be used as little as possible or not, so as to protect the natural enemies and maintain the ecological balance in the field.
Choose the sickness period. For diseases, the growth period of susceptible diseases is the best time for chemical control. If the seedling stage is most susceptible to bacterial blight, it can be mixed with fungicide before planting or sprayed at the seedling stage; if the flowering period is also the peak period of disease infection, it should be controlled during the flowering period.
Choose the weed sensitive period. The application of herbicides should generally be controlled during the sensitive period of weeds. For weeds that are seed-grown, the herbicides are more sensitive to herbicides during the shoot and seedling stages. Therefore, this period is often the time for herbicides. Usually control is good before sowing or weeds 1 to 2 leaves. When using broad-spectrum herbicides, such as gram-free, glyphosate, and nutrient, it should be used when the weeds are more sensitive in the growing season, the herbicidal effect is obvious, and the long-lasting effect is long. If weeds are protected from spring and summer farmland, it should be in the early stages of weeds.
Choose the rodent fasting period. In terms of effective rodent control, the release of drug lords should be better in the rat fasting stage. Years of experiments have confirmed that the best effect of rodent control in spring is because the winter storage of the rodent is depleted and the feeding of the poisonous cockroach is more corresponding. At the same time, the rodent in spring can also reduce the cardinal number and protect the normal emergence and safe growth of spring-sown crops. .
Choose a plant safety period. Spraying when the crop is strongly resistant to the medicinal agent, so as not to cause crop phytotoxicity.
Select a security interval. According to the safe use standards of pesticides, the control is applied during the safety interval to avoid excessive pesticide residues, resulting in undesirable results.
Choose the pest season. The period of emergence of pests can be the period of egg hatching, which can be the period of larval growth, or the period of adult growth. In which period, the best effect of drug control is determined, depending on the specific situation. In principle, it is necessary to control the living habits of pests, which is carried out when it is most vulnerable to killing and can effectively control damage. For example, in the control of armyworms, spraying at the peak of egg hatching, although the control effect on hatched larvae is good, it does not necessarily work for late hatching larvae, and when the larvae are at the peak of 2 to 3 years old, spraying the drug, one control Can solve pest problems. For example, when the cotton bollworm is controlled, the newly hatched larvae will be drilled into the bud bell in a short period of time. If the larva is used at the peak of 2 to 3 years old, the control effect is very poor, and the medicine is used at the peak of the egg hatching period. The control effect is very obvious. The same is true for rice aphids and Spodoptera litura.
Choose the sensitive period of natural enemies. In the period when the natural enemies of the pests are sensitive to the chemical reaction, the medicine should be used as little as possible or not, so as to protect the natural enemies and maintain the ecological balance in the field.
Choose the sickness period. For diseases, the growth period of susceptible diseases is the best time for chemical control. If the seedling stage is most susceptible to bacterial blight, it can be mixed with fungicide before planting or sprayed at the seedling stage; if the flowering period is also the peak period of disease infection, it should be controlled during the flowering period.
Choose the weed sensitive period. The application of herbicides should generally be controlled during the sensitive period of weeds. For weeds that are seed-grown, the herbicides are more sensitive to herbicides during the shoot and seedling stages. Therefore, this period is often the time for herbicides. Usually control is good before sowing or weeds 1 to 2 leaves. When using broad-spectrum herbicides, such as gram-free, glyphosate, and nutrient, it should be used when the weeds are more sensitive in the growing season, the herbicidal effect is obvious, and the long-lasting effect is long. If weeds are protected from spring and summer farmland, it should be in the early stages of weeds.
Choose the rodent fasting period. In terms of effective rodent control, the release of drug lords should be better in the rat fasting stage. Years of experiments have confirmed that the best effect of rodent control in spring is because the winter storage of the rodent is depleted and the feeding of the poisonous cockroach is more corresponding. At the same time, the rodent in spring can also reduce the cardinal number and protect the normal emergence and safe growth of spring-sown crops. .
Choose a plant safety period. Spraying when the crop is strongly resistant to the medicinal agent, so as not to cause crop phytotoxicity.
Select a security interval. According to the safe use standards of pesticides, the control is applied during the safety interval to avoid excessive pesticide residues, resulting in undesirable results.
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