The application period of crop pests and diseases generally refers to the period when pests and diseases are the weakest in the whole growth period and the most sensitive to pesticides . At this time, the use of chemicals for prevention and treatment can achieve twice the result with half the effort. The control period of different pests and diseases is also different. The determination of the appropriate period of application should generally follow the following principles:
In the weakest link of pest activities, pesticides are generally in their infancy, have weak resistance to chemicals, and have many fatal weaknesses in the living habits of pests and diseases. These are favorable periods for applying pesticides. Within 10 to 12 days after the larvae are incubated, the pests are not dispersed and the control is carried out, and the effect is best. In addition, pests are generally the best time to use pesticides for prevention and treatment before the age of 3 years.
In the early stage of the occurrence of pests and diseases, according to the prediction that agricultural pests and diseases may be predicted to occur, the prevention and control of spraying in the early stage of pests will be carried out. In this case, pests and diseases are limited to spotting, and have not spread to disasters. Not much, the damage is not very big, if it can be sprayed in time, it is easy to get control.
In the growth stage of crops with strong resistance to crops, the resistance to pesticides is different at different growth stages. Generally speaking, the seed resistance is the strongest, and the crops generally have strong resistance to external adverse environment during the growth period such as seedling, flowering, grouting and fruit germination and flowering, and are prone to phytotoxicity. Apply less or reduce the concentration of the application.
In the period when the crop is most vulnerable to pests and diseases, for example, the seedling stage is most susceptible to blight, and it can be seeded with a bactericide before planting or sprayed at the seedling stage. The tillering stage and the booting stage of rice are most vulnerable to the damage of the mites and mites. At this time, it is necessary to focus on fighting drugs and killing insects, and it can be treated with half the effort.
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