Brown planthoppers and white-backed planthoppers are migratory pests that cannot be overwintered in northern regions such as Jiangsu. The source of insects in Jiangsu and other places is from the south. Under normal circumstances, the number of infested insects is not enough to cause damage to rice in a short period of time. It takes 1 to 2 generations to accumulate a certain amount, causing damage to rice. Therefore, according to the changes in the amount of insects in the field, we can keep abreast of the damage that rice planthoppers may cause to rice. In general, drug control is needed when the amount of rice planthoppers in the field reaches a certain level.
The use of drugs to control rice planthoppers, if dichlorvos, chlorpyrifos, isoprocarb and other drugs are used, the duration of efficacy is short, and even if all the adults and nymphs in the field are killed after application, there are still a large number of eggs that will hatch nymphs and fieldworms. The quantity tends to rebound quickly, requiring multiple medications to better control the amount of insects. The use of highly effective pesticides that have a long duration of effect and internal absorption conductivity not only has good control effect, but also reduces the number of prevention and control. Previously used in the production of imidacloprid, buprofezin, belongs to this class of drugs. Combining the control of other pests before and after rice headings, one application of these drugs can usually control the occurrence and harm of late rice planthoppers in rice. Around 2005, brown planthopper produced a strong resistance to imidacloprid, and its control effect was poor after application. This drug was generally no longer used to control brown planthopper in large areas. In recent years, drugs such as nitenpyram and pymetrozine, which are widely used in large areas, have a long pot life, internal conductivity, and high activity against rice planthoppers. Usually, they can be applied once at the heading stage of rice. Control the occurrence and damage of late rice planthoppers in rice. When the amount of insects in the field is large, drugs such as isoprocarb and chlorpyrifos can be combined to quickly control the amount of insects in the field.
Before the rice is harvested, if there is a large amount of rice planthoppers in the field, it can be used to spread with dichlorvos in the field when it is dry, and to kill rice planthoppers to control the amount of insects.
The use of drugs to control rice planthoppers, if dichlorvos, chlorpyrifos, isoprocarb and other drugs are used, the duration of efficacy is short, and even if all the adults and nymphs in the field are killed after application, there are still a large number of eggs that will hatch nymphs and fieldworms. The quantity tends to rebound quickly, requiring multiple medications to better control the amount of insects. The use of highly effective pesticides that have a long duration of effect and internal absorption conductivity not only has good control effect, but also reduces the number of prevention and control. Previously used in the production of imidacloprid, buprofezin, belongs to this class of drugs. Combining the control of other pests before and after rice headings, one application of these drugs can usually control the occurrence and harm of late rice planthoppers in rice. Around 2005, brown planthopper produced a strong resistance to imidacloprid, and its control effect was poor after application. This drug was generally no longer used to control brown planthopper in large areas. In recent years, drugs such as nitenpyram and pymetrozine, which are widely used in large areas, have a long pot life, internal conductivity, and high activity against rice planthoppers. Usually, they can be applied once at the heading stage of rice. Control the occurrence and damage of late rice planthoppers in rice. When the amount of insects in the field is large, drugs such as isoprocarb and chlorpyrifos can be combined to quickly control the amount of insects in the field.
Before the rice is harvested, if there is a large amount of rice planthoppers in the field, it can be used to spread with dichlorvos in the field when it is dry, and to kill rice planthoppers to control the amount of insects.
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