When it comes to glyphosate, farmers and friends are very familiar with it and have been using it for decades. Due to its wide weeding range, complete dead weeds, long lasting effect, low price and many other advantages, it is currently the most widely used herbicide. But there are also people who use glyphosate to kill weeds that are not very effective. What is the cause?
Glyphosate is an organophosphoric acid biocidal herbicide with good systemic conductivity. After being absorbed by weed stems and leaves, glyphosate can be transported to various parts of the plant. By inhibiting the synthesis of amino acids in weeds, the Protein synthesis is disturbed, causing the plant to fail to grow normally and eventually die. Therefore, weeds can only completely kill weeds if they absorb enough glyphosate. Due to years of use, some weeds have developed drug resistance, and the killing effect on some weeds is not ideal. In order to achieve the ideal weed control effect, the following points must be paid attention to when using glyphosate to achieve the ideal weed control effect.
1. Spray evenly and thoroughly: Weeds can only be completely killed by absorbing enough glyphosate. The herbicidal effect of glyphosate at one time depends on whether the liquid can penetrate the grass. If the spraying speed is too fast, and the weeds have less pesticide per unit area, the effect will naturally not be good. Therefore, when spraying, it must be sprayed evenly. Allow all weeds to fully absorb enough chemicals to achieve the desired weed control effect.
2. Use at high temperature: Glyphosate is a systemic herbicide. The higher the temperature, the faster the conduction in the weeds and the faster the weeds die. When the temperature is low in spring, it generally takes 7 to 10 days to take effect, and the weeds begin to turn yellow in more than 10 days. In summer, the temperature is high, and the effect can be seen in 3 days, and the grass can turn yellow in 5 days. Try to use it at a lower temperature.
3. Use in combination as much as possible: due to the use of glyphosate for many years, some weeds have strong resistance to glyphosate, such as beef tendon grass, small flying scorpion, reed grass, green onions, garlic, leeks, big nest vegetables, Field bindweed, wild morning glory and other weeds, and some malignant weeds also have strong drug resistance, such as iron amaranth of Euphorbiaceae, endive of Asteraceae, weeds with milk (white pulp) in the weeds For example, the effect of varnish, the common Commelina and the tendon grass, etc., which are common in farmland, has also begun to be bad. To control these weeds, formulas such as 2A·glyphosate, dicamba·glyphosate, glufosinate·glyphosate, etc. are used, and the resistant weeds have a good control effect.
4. Use in large grasses: The larger the weeds, the larger the leaves, and the more herbicides they absorb. Since glyphosate is a systemic pesticide, if the weeds do not have a large enough leaf area to absorb the liquid, the herbicidal effect will not be very good. It should be applied when the weeds are growing vigorously, and the weeding effect is better.
5. Master the application time: Glyphosate is a systemic herbicide. Only when it is fully absorbed by the weeds can the weeds be completely killed. When the temperature in spring and autumn is low, it can be sprayed at noon; When higher, spray after 4 pm. Increases absorption of medicinal liquid by weeds. For weeds with a waxy layer on the surface, silicone or other pesticide adjuvants can also be added to increase the herbicidal effect.
Post time: Jun-27-2022