When using pesticides, we are generally in the period when the pests are weak and sensitive to pesticides throughout the growth period. At this time, the use of pesticides for prevention and control can achieve a multiplier effect. However, different pests and diseases have different characteristics, how to determine the appropriate pesticide application period? The following editor summarizes the four principles for determining the time of pesticide application:

Pesticides are applied in weak links in the activities of pests. Generally, pests are in their infancy and have weak resistance to pesticides. They also have fatal weaknesses in their life habits. These are all favorable periods for pesticide application. Within 10 to 12 days after the larvae are fully hatched, the pests should be controlled when the pests are not dispersed, and the effect is good. In addition, before the third instar of pests, it is generally a good time to use pesticides for control.

In the early stage of the occurrence of diseases and insect pests, apply pesticides according to the forecast of agricultural diseases and insect pests that may occur. Grasp the favorable period in the early stage of the occurrence of pests. Not many, and the damage is not great. If it can be sprayed in time, it can be easily controlled.

In the growth period when the crops are more resistant to pesticides, the resistance of the pesticides to the pesticides is different at different growth stages. Generally speaking, seeds have strong drug resistance, and crops are generally not very resistant to the external environment during the growth period of seedlings, blooming, grouting, and fruit tree germination and flowering, and they are prone to phytotoxicity. Do not apply as much as possible during this period. Either less spray or reduce the concentration of spray.

When crops are susceptible to pests and diseases, for example, the seedling stage is susceptible to wilt. You can dress the seeds with fungicides before sowing or spray them during the seedling stage. Rice is susceptible to Chilo suppressalis at the tillering stage and booting stage. At this time, the focus should be on pesticides and insecticides, which can get twice the result with half the effort.