How to determine the pot life of flowers using pesticides
Appropriate application of pesticides can not only save pesticides, reduce costs, but also improve efficacy, reduce drug residues, effectively control pests and diseases, and ensure the normal growth of flowers. In determining the appropriate application period, should be considered from the following aspects: 1, pests for the period of pests, pests can be the peak period of the hatching of eggs, larvae, and the age of adult emergence, exactly Which period of application depends on the circumstances. In principle, we must master the living habits of pests and carry out the stages when they are most likely to kill insects and control them effectively. When pests are controlled, pesticides should generally be applied at a young age before the third instar of pests. At this time, they can receive a multiplier effect. The reasons are: (1) The young insect pests are very thin at the 3rd instar precursor wall and have a lot of microhairs on the body wall. The epidermis on the micromathematical part is very thin, and the medicine can easily penetrate this layer. . At the same time, at this time, the insect body is small, the food intake is small, the harm is light, the activity range is small, and the drug resistance is weak. Therefore, it is necessary to determine the appropriate control period and control the application before the third instar, which can achieve the best control effect. When pests reach 4 to 6 years of age, pest food intake and body wall thickness are greatly increased, and the thickness is 50 to 100 times that of the 1st instar larvae, and the microscopic hair on the body wall is also absent, so that the medicament does not easily adhere to the body wall. On and through the body wall, it is more difficult to reach the body, thus greatly affecting the insecticidal effect. (2) As the age of pests increases, the amount of fat in the insects also increases. These fats have the effect of breaking down pesticides. The higher the body fat content of pests, the more obvious this effect is and the stronger the drug resistance is. 2. In the sensitive period of natural enemies, during the period when the natural enemies of pests are relatively sensitive to chemical reactions, they should use as little or no medicine as possible to protect natural enemies. 3. Sensitive growth period For crops, the growth period of susceptible disease is the appropriate period for disease prevention and control. For example, seedling stage is most vulnerable to bacterial blight, seed dressing with fungicides or spray control at seedling stage is very effective. it is good. 4. Herbicides are applied during the sensitive period of weeds and should generally be used during the sensitive period of weeds. For weeds that are propagated by seeds, they are generally more sensitive to herbicides during the young shoot stage. Therefore, this period is often used as a suitable period for controlling weeds. When broad-spectrum herbicides are used, such as glyphosate and Gramoxone, they are more sensitive during the vigorous growth of weeds. If we control spring grass and summer grass, it is best to spray during weeds. 5. For rodents during fasting period, from the effective control of rodent density, the bait should be placed in the best stage before the fasting and mass reproduction of rodents. Years of experiments have proved that the effect of spring rodent control is best. This is due to the exhaustion of winter food for rats and the corresponding feeding of baits. 6. The safety of plants during the period of plant safety is a prerequisite for determining the appropriate period of application. For example, when some flowers are applied at the seedling stage, the yellow leaves of young plants are easily killed; some flowers are applied during the flowering period, which can easily cause the flowers to fade. Therefore, when applying pesticides, it is necessary to select plants to spray pesticides during periods when they have a strong resistance to pesticides, so as not to cause plant damage. 7. During the period of application of safety interval pesticides, pesticides should also be applied within the safety interval in accordance with the standards for the safe use of pesticides so as to avoid excessive pesticide residues and adverse consequences.