Tripyrasulfone, the structural formula is shown in Figure 1, China Patent Authorization Announcement No. : CN105399674B, CAS: 1911613-97-2) is the world’s first HPPD inhibitor herbicide that is safely used in the post-emergence stem and leaf treatment of rice fields to control gramineous weeds.
Mechanism of action:
Triazole sulfotrione is a new type of herbicide that inhibits p-hydroxyphenylpyruvate dioxygenase (HPPD), which converts p-hydroxyphenylpyruvate into urine by inhibiting the activity of HPPD in plants. The process of black acid is blocked, which leads to the abnormal synthesis of plastoquinone, and plastoquinone is a key cofactor of phytoene desaturase (PDS), and the reduction of plastoquinone hinders the catalytic action of PDS , which in turn affects the biosynthesis of carotenoids in the target body, leading to leaf albinism and death.
Function characteristics:
1. Tripyrasulfone is a new HPPD inhibitor, which is the first time that HPPD inhibitor is safely used in post seedling stem and leaf spray treatment in rice field.
2. Tripyrasulfone can effectively solve the problem of resistant seeds and multi-resistant barnyardgrass and barnyardgrass.
3. There is no interaction resistance between Tripyrasulfone and the current mainstream medicine, which can effectively solve the current and future more complex problems of resistance to millet and barnyard grass.
4. Tripyrasulfone can be mixed with an appropriate amount of 2 methyl · methazopine to improve the control efficiency of broadleaf grass and sedge weeds and improve the weeding efficiency.
Matters needing attention:
1. Before application, it is necessary to conduct closed treatment to reduce the weed base and leaf age.
2. Tripyrasulfone can not be mixed with any organophosphorus, carbamate, paclobutrazol insecticides and fungicides or used within 7 days. It can be used at most once during the whole growth period of rice.
3. It is forbidden to spread fertilizer 7 days before and after application.
It is forbidden to mix the use of bensulfuron-methyl, pentaflusulfurochlor and other ALS inhibitors and quinclorac.
4. The weather is sunny, and the optimum spraying temperature is 25~35 ℃. If the temperature exceeds 38 ℃, spraying is not recommended. If there is rain within 8 hours after spraying, supplementary spraying is required.
5. Drain water before spraying to ensure that more than 2/3 of the weed leaves are exposed to the water and fully apply the pesticide; After the application of the pesticide, the water is returned to 5~7 cm within 24~48 hours and kept for more than 7 days. The longer the water retention time is, the more stable the control effect is.
6. Some indica rice varieties are sensitive to Tripyrasulfone, which may lead to leaf albinism, but can be recovered, without affecting rice yield.
Summary:
Tripyrasulfone has a wide spectrum of herbicides and high post-seedling weeding activity, especially for Echinochloa crus-galli, Leptochloa chinensis, Monochoria vaginalis and Eclipta prostrata, and has no cross-resistance with the current mainstream herbicides in rice fields, such as cyhalochlor, pentafluorosulphonachlor and dichloroquinoline acid. At the same time, it is safe for rice seedlings and is suitable for rice transplanting and direct seeding fields, It is an effective agent to solve the problem of chemical weeding in paddy field at present – to control resistant barnyard grass and millet, and has broad application prospects. Through many tests, it was found that many of the compounds described in Tripyrasulfone have good selectivity for grass lawns such as Zoysia japonica, bermudagrass, tall fescue, bluegrass, ryegrass, seashore paspalum, and can control many key grass weeds and broad-leaved weeds. The tests of soybean, cotton, sunflower, potato, fruit tree and vegetable under different application methods also showed excellent selectivity and commercial value.
Post time: Feb-14-2023
