Zozolopyrin: New Herbicides for Grazing Weeds in Wheat Fields
Recently, several readers from Binhai, Dongtai, Taixing, Hai'an, and Yixing have telephoned to report that the use of isoproturon in the control of grassy weeds during the growing period of local barley has been low, but the temperature is now low. ". They asked if there were any other stem and leaf treatments that could be used to control grassy weeds in barley fields and there would be no "frozen phytotoxicity."
Suitable for the treatment of stems and leaves of barley during the growth control of grass weeds in the field very few herbicides, over the years only Isoproturon, wild Yan dry, konjac yloxa (Dagu Ma) and other agents. Among them, the wild yan dry and carbazolone are poor in applicability, and they are rarely used in large-scale production; in the large-scale production, mainly used is an isoprenol. Due to many years of use, the number of weed populations with strong tolerance to isoproturon in many parts of our province has increased, and the weeding effect has decreased significantly, especially when the field weeds in spring are larger. In addition, the drug will reduce the cold resistance of wheat seedlings, and the occurrence of “frozen phytotoxicity†will occur when the drug is exposed to low temperature frost. At present, barley has entered the overwintering period. The temperature is low and changes frequently. There is a greater risk of phytotoxicity when using isoproturon. However, after the temperature rises in the spring, the weed age in the field is increased, and the effect of using isoproturon is often poor.
Swiss Syngenta Crop Protection Co., Ltd. introduced this year's new Aoxiu 50g/l oxazoline oxime EC (It is understood that the product is expected to be launched in Jiangsu market in February 2011, the purchase of telephone number, 13951610687), registered for Barley fields control annual grass weeds. The drug can be used to control a variety of grass weeds in the barley growing period, and the herbicide spectrum is similar to that of konjac oxadol (Puma, etc.), clodinafop (Maji, etc.), and can effectively control ryegrass and wild Oats, Setaria virescens, A. aequalis, Japan apia, hard grass, grass, head grass and other grass weeds. The popularization and application of this drug is expected to break the situation in which Isoprolong dominates the world.
It is understood that oxazoline oxalate is an acetyl-CoA carboxylase inhibitor herbicide that can be absorbed by weed leaves and then transmitted to meristems to inhibit the lipid synthesis of dividing cells, leading to the death of weeds. Sensitive weeds stop growing 48 hours after application, and weedy leaves begin to yellow within 1 to 2 weeks and weeds completely die within 3 to 4 weeks. The response speed of the weed victim after spraying is related to climatic conditions, weed species, and growing conditions. The drug is safe for barley. Under adverse climatic conditions (low temperature or high humidity), barley leaves may experience temporary chlorosis but do not affect their normal growth and final yield. The drug degrades rapidly in soil and is rarely absorbed by the roots. It has very low soil activity and has no effect on post-planting crops. Rainwater washout, and rain in one hour after spraying basically does not affect the weeding effect.
The drug application period is wide, and it can be applied to the barley from the 2nd leaf to the flowering stage. It can control the wild oats from the 2 leaf stage to the end of the tillering stage, and prevent the ryegrass from the 2 leaf stage to the first tillering stage. Considering the application cost and the herbicidal effect, it is most suitable to apply the herb at the 3 to 5 leaf stage of grass weeds. Pre-winter application of pesticides, per acre with love show 50 grams / litre oxazoline emulsifiable concentrate EC 60 ~ 80 ml; spring application, per acre with love show 50 grams / liter of oxazoline emulsifiable concentrate EC 80 ~ 100 ml. When weeds are older or occur at higher densities, it is advisable to use high doses or to increase the dose appropriately. Usually add 15-30 kg of water per acre, evenly spray.
The drug can be mixed with tribenuron-based herbicides such as tribenuron-methyl, Maixi 58 g/litre bifloroxime suspension and other herbicides to achieve the purpose of one-step application of pesticides to prevent weeds all over the field, but be careful to mix The ureide herbicides such as tribenuron-methyl, sulfonamide herbicides such as Maixi 58 g/litre biflorapyramine suspension may reduce the efficacy of the drug against grass weeds, and the dosage should be increased as appropriate. ; Not recommended with 2,4-D, 2 A 4 chlorine, dicamba, fluoxyl and other drugs mixed.
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