In recent months, several international agencies have predicted the possibility of extreme and destructive weather around the world. On July 4, the World Meteorological Organization concluded that the tropical Pacific Ocean experienced the first El Niño phenomenon in seven years, and that destructive weather and climate patterns around the world are basically a foregone conclusion.
The weather is sunny and hot, and all conservationists must take sun protection measures and replenish water in time when going out. In addition, when spraying pesticides, it is necessary to avoid high temperature periods as much as possible, because when many pesticides are used in high temperature periods, on the one hand, it is very easy to cause phytotoxicity, and on the other hand, the effect is reduced.
The phytotoxicity of some chemicals at high temperature is mainly due to the following two points:
1. Related to the nature of the drug
Inorganic pesticides and pesticides with high water solubility and high permeability, such as copper sulfate, sulfur powder, and lime sulfur mixture, are very likely to cause phytotoxicity to crops when used at high temperatures, because the structural stability of the chemical ingredients will decrease after a certain temperature. changes, resulting in phytotoxicity.
2. Related to crop resistance
Plants with leathery leaves such as Euonymus euphratica are more resistant to pesticides, while plants with thin cuticles are less resistant to pesticides, and are more prone to phytotoxicity when used in high temperature weather.
Next, I will take you to know which medicines need to be used to avoid high temperature time, so that everyone can avoid unnecessary damage to medicines as much as possible!
These kinds of pesticides should avoid high temperature:
1. Organophosphorus pesticides: High temperature will decompose organophosphorus pesticides and reduce their effectiveness.
2. Cypermethrin pesticides: High temperature will decompose cypermethrin pesticides, reducing their effectiveness and producing toxic gases.
3. Bactericide: High temperature will reduce the stability of the bactericide and degrade it, thereby reducing its bactericidal effect.
For example, abamectin, pyraclostrobin, nitenpyram, chlorfenapyr, fluazinam, propargite, diafenthiuron, etc. The specific temperature needs to be divided into plants. Different plants have different suitable temperatures.
Source: AgroPages
