Views: 8 Author: Site Editor Publish Time: 2020-04-26 Origin: Site
Agricultural machinery and tools indispensable to agricultural mechanization
It is a busy spring season, for farmers this season in addition to the next seed fertilizer selection pesticides and spraying tools, so spraying pesticides is a very good effective tool spraying machine!A lot of people know to choose big brand spray machine, but the use of spray machine method is not.Today, I will introduce to you how to determine the time of pesticide application, when the application effect is good!
Peak and development period of insect pests: for insect pests, the peak and development period of insect pests can be the egg incubation stage, the larva stage, the adult stage, after all, in which period of drug control effect is very obvious, it depends on the specific situation.In principle, it is necessary to control the living habits of pests, in the stage where pests are easily killed and damage can be effectively controlled.For example, in the prevention and control of armyworm, spraying at the peak of egg block incubation, although the prevention and control effect is good for the hatched larvae, but for the late hatching of the larvae is not necessarily effective, and when the larvae 2-3 instar peak, spraying agents, a pest control can be solved.Another example is the prevention and control of cotton bollworm, because the hatchling larvae in a short period of time will be drilled into the bud bell, if the larvae at the peak of 2-3 instar remedication, the prevention and control effect is very poor, and at the peak of egg yolk incubation time, the prevention and control effect is particularly obvious;The same goes for rice borers and twill night moths.The time of pesticide application is how to determine, when pest control, usually should be in the larvae 2-3 ages before the peak of the peak of the drug, some should be restrained after the peak of the egg block incubation drug, then the application can receive twice the result with half the effort.
The main causes are:
Is a young insect body wall before the age of 3 are very thin, the body wall is also long have a lot of fluff, micro hair growing parts of the skin is very thin, reagent is easily through this layer, and then the insect body small, appetite is big, light damage, activity area is small, weak resistance (resistance), so the discriminant pest control optimum stage, before the peak of drug use should be moderate in 2-3 age, should be some moderation in hatch egg mass before and after the peak of drug use, can achieve good control effect.When it comes to an age of 4 to 6 pests and insect pests of food intake and body wall thickness increased greatly, its thickness can reach 1 instars of 50-100 times, haven't got tiny hair on the body wall, so the easy adhesion on the body wall and through the body wall, achieve pests in vivo is difficult, at the same time, the pest resistance (resistance) medicinal also jumped sharply, thus greatly affect the insecticidal effect of the drug.
Second, after the insect age increases, the amount of fat in the insect body also increases, which has the function of accumulating and breaking down many pesticides.The higher the fat content in the pest, the more obvious the effect, and the stronger the resistance.
The third is the sensitive period of natural enemies: during the period when the reaction of hostile agents to pests is relatively sensitive, the medicine should be used as little or no as possible to protect the natural enemies and maintain the ecological balance in the field.
Fourth, the affected growth period: for diseases, susceptible to the disease of the growth period is a good drug control period.If the seedling is susceptible to bacterial blight, you can use fungicide before sowing or spray prevention and treatment in the seedling;If the flowering period is also the peak of the disease infection, therefore, it should be controlled in the flowering period to choose the key route of the drug prevention and control, control the occurrence and spread of the disease.
Fifth, the weed sensitive period: the application of herbicide should be controlled in the weed sensitive period.For seed-grown weeds, the budding and seedling stages are more sensitive to herbicides and are therefore often used as herbicides.It is usually better to control the seeds before sowing or to weed 1-2 leaves.When using a broad spectrum of herbicides, such as gram-traceless, glyphosate, roundup, etc., the herbicide should be used when the growth period of weeds is more sensitive, the weeding effect is obvious, and the duration of long.If weeds are prevented in fields in spring and summer, herbicides should be sprayed at the beginning of their bloom.
The sixth is the period when the rats stop feeding.In terms of the effective control of rat damage degree, the release of erbium poison should be controlled in the stage of rodent disfeeding.Many years of experiments have proved that the effect of killing rodents in spring is good, which is because the rats' winter storage food is used up, and more erbium is ingested.At the same time, rodent extermination in spring can also reduce the base to protect the normal emergence and safe growth of spring sowing crops.
Seven is the plant safety period.The safety of insecticide to plants is a prerequisite for the identification of pesticide application period.In the application of pesticides, to choose the crops have a strong drug resistance to spraying, so as not to cause crop damage.
Eight is the safety gap.Pesticide application period, should also be in accordance with the pesticide safety use standards, control in the safe interval period of application, lest pesticide residue exceeds the standard, cause adverse results.