Pyrazosulfuron was released in 1990, also known as Mercury, Cao Kexing, Rice Song, Daoyuesheng, etc. It belongs to sulfonylurea herbicides and has the advantages of low dosage and low toxicity.
Pyrazosulfuron-methyl is a selective systemic herbicide. The active ingredient can diffuse rapidly in water, and is absorbed by the roots of weeds and then transmitted to the plant to inhibit acetolactate synthase, the amino acids proline and the necessary light. The biosynthesis of the acid prevents cell division, rapidly inhibits the growth of the stems and leaves of the weeds, and then completely dies. Sometimes the weeds are still green after application, but growth and development have been inhibited, losing the ability to compete with rice.
After rice is absorbed, it undergoes hydroxylation reaction in the plant and rapidly degrades into inactive compounds, so it is safe for rice. However, the resistance of different varieties of rice to pyrazosulfuron-methyl is quite different. It is safe for rice under normal conditions. However, when rice fields are leaking, planting is too shallow or the dosage is too high, rice growth may be temporarily Inhibition, but can quickly resume growth, no effect on yield. The drug mist and the drainage in the field are harmful to the surrounding broad-leaved crops and should be noted.
The efficacy of pyrazosulfuron-methyl is not affected by temperature, and its long-lasting effect is applied once and can control a variety of weed hazards in the rice growing season. It has good control effects on broadleaf weeds, sedge weeds, and alfalfa.
1. Control objects and methods of use
Pyrazosulfuron can control rice live fields, transplanted fields, throwing weeds, and can control annual and perennial broadleaf weeds and sedge weeds, such as heterosex sedge, water sedge, sedge, and ragweed , cress, squash, wild sage, eye dish, green ping, sausage and so on.
Pyrazosulfuron-methyl has a very low control effect on the alfalfa above the second leaf stage, so it is often mixed with grass or quinclorac and has excellent control effect.
1 rice field and live field: rice 1 ~ 3 leaf stage (3 to 20 days after transplanting), with 10% wettable powder 15 ~ 30 grams of mixed soil, can also be sprayed on water, after the drug to maintain the water layer 5 -7 days;
2 Rice Shiqiantian, used 3-6 days after rice throwing (plugging), the same method as Putian;
3 dry live field: rice 1 to 3 leaf stage application, application of 10% wettable powder, spray on water, 1-2 days after application, flooding once, and keep the soil moist;
4 Rice transplanting field: 3-20 days after transplanting, mix with 10% wettable powder and 15kg fine soil, apply directly or 10% dispersible tablet, and keep 3~5cm water layer 5-7 after medicine day.
2, matters needing attention
1 Pyrazosulfuron-methyl is safer for rice, but different varieties of rice have great differences in drug resistance. Early rice varieties have good safety and late rice varieties are relatively sensitive. It should be avoided in late rice germination, otherwise it will cause phytotoxicity. .
2 Putian or live field application, should ensure that the field is wet or have a thin layer of water, transplanting the field should be kept for more than 5 days to achieve the desired results.
3 The product mist and field drainage have harmful effects on the surrounding broad-leaved crops and should be noted.
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