What are the precautions for using fungicides?
Fungicides are an indispensable pesticide product in our planting and production. Because no matter what we plant, during its growth process it will inevitably encounter some diseases that harm the growth of the crops. However, as a pesticide, fungicides still have many points that require our attention when using them. So today, the editor has brought you the precautions for using fungicides. Let's take a look below!
1. Pay attention to concentration
When we spray fungicides, especially when using liquid formulations at a certain concentration for spray control. We must pay attention to controlling the concentration well. First, the fungicide needs to be diluted with water to avoid excessively high concentration. If the concentration is too high, then it will not only lead to waste, but also very easily cause crop phytotoxicity. However, the concentration should not be too low either, because too low a concentration will cause the efficacy to fail. If it is some non-wettable powder, then first mix the powder into a paste, then add an appropriate amount of water to prepare it.
2. Spraying time
The spraying time of fungicides is directly related to their efficacy. If the spraying time is too early, then the efficacy will be too low and lead to waste. But it also should not be too late, because if it is too late, it is easy for a large number of pathogenic microorganisms to invade the crops. Even if a systemic therapeutic agent is sprayed, there will be no obvious effect. When spraying, we should pay attention to doing a good job of forecasting according to the disease occurrence patterns of the crops and the actual situation, ensuring that the spraying guarantee work is done before the disease occurs or at the early stage of the disease.
3. Spraying frequency and quality
The spraying frequency also requires our special attention. The spraying frequency is mainly controlled according to the residual effective period of the fungicide and the climate environment. Usually spray once about every two weeks, about three times in total. If it rains after spraying, then re-spray in time, and at the same time also consider the cost well to avoid excessive pesticide cost. Then control the spraying amount well; it should not be too little, because too little cannot guarantee protection for the crops in all aspects. Too much will cause phytotoxicity. When spraying, ensure uniform spraying, and the front and back sides of the leaves should be sprayed thoroughly.
4. Phytotoxicity problems
Phytotoxicity is the issue that requires the most attention when we use fungicides. When spraying, there are many reasons that can cause phytotoxicity in crops, for example, agents with strong water solubility are most prone to causing phytotoxicity. However, different crops also differ in their sensitivity to agents. For example, Bordeaux mixture usually does not cause phytotoxicity. Crops such as potatoes and beans are relatively sensitive to lime sulfur mixture and are prone to phytotoxicity from this type of agent. At the same time, crops at different growth stages also differ in their response to agents. Generally, during the seedling stage and booting stage of crops, this is the period when crops are most susceptible to phytotoxicity.
The above is a brief introduction to the precautions for using fungicides. That is all for today's introduction. This article is for reference only, and I hope it can help everyone!