Background and overview[1]
Organophosphorus pesticides are plastic elastomers with high efficiency and broad spectrum, and have been widely used in the control of agricultural and sanitary pests. Due to low selectivity and high toxicity between target organisms and non-target organisms, in 2007, methamidophos, parathion, methylparathion, monocrotophos and Five kinds of organophosphorus pesticides including phosphamidon have been banned in my country. However, due to the advantages of such pesticides such as cheapness, high efficiency, and low bioaccumulation, some organophosphorus pesticides with good bioselectivity are still widely used. Among the 232 pesticides sold and used in 2103, 91 were organophosphorus pesticides and carbamate pesticides. That is to say, among the pesticides currently in use, organophosphorus pesticides still occupy the largest share. Larger proportion.
After organophosphorus pesticides enter the organism, they can cause a variety of acute or chronic toxic effects on the organism. In biology, organophosphorus pesticides can undergo a variety of biological transformations or metabolic reactions, forming a variety of metabolites with different properties, resulting in changes in their biological toxicity. Their biotransformation is not only related to the detoxification metabolism of pharmaceuticals, but some are also closely related to their toxicity and biological selectivity. In addition, the metabolic resistance of many insects to organophosphorus pesticides is also related to the changes in the metabolic effects of pesticides in resistant insects. Therefore, understanding the biological metabolism mechanism of organophosphorus pesticides is important for mastering their toxicological mechanisms and biological selectivity, effectively controlling pest resistance to such pesticides, and using organophosphorus pesticides safely and rationally. meaning. Pipermethonate is one of the organophosphorus pesticides.
Apply[2]
Pipimethonate is a selective herbicide. Young weeds absorb pesticides from the soil through their roots, coleoptiles and cotyledons, inhibit their growth and die due to stearic acid. It can control annual grass weeds and sedge weeds, such as barnyard grass, cow’s weeds, eye cabbage, sunflower grass, firefly, sedge, duckweed, knotweed, dwarf arrowhead, amaranth, waterweed Horsetooth etc. It has poor control effect on dicotyledonous weeds.
Currently, piperifos is mainly used in combination with other ingredients. For example, a herbicidal composition containing triazulfentrione is prepared. The herbicidal composition includes a herbicidal effective amount of active ingredient A and active ingredient B, wherein the active ingredient A is triazulfentrione and the active ingredient B is selected from One or more of the following compounds: indanidone, pipefenacetate, tetrazofenpyr, herbacetate, stylophos, 2-methyl-4-chloride sodium salt, prometrazine, diclofenac, clopyrazine cyclopentazone, graminic acid, clofenacetate, oxazofen, cyclofenacet, cyclofenacet, dicyclosulfentrione, cyclopentazone, isoproturon, pyrazosulfuron, sufurfuran ketone, penoxsulam. The composition can effectively control weed problems such as barnyard grass, rice barnyard grass, steppegrass and other weeds in crops, and has the characteristics of expanding the herbicidal spectrum, reducing the application amount, being safe for crops, producing synergistic effects and solving resistant weeds.
How to use[2]
In rice fields, 6-12 days after transplanting, after weeds germinate, use 133-200mL/acre of 50% concentrated emulsion, mix with 15-20kg of fine soil or fluvial sand soil, spread evenly, or add 40-50kg of water , use a sprayer with a general fan-shaped nozzle to spray evenly. Keep the water layer in the field at about 3cm during application. Only irrigation is done without drainage for 5-7 days after the application. From now on, follow normal water management. Changes in water depth in the rice field have little impact on the weeding effect, but Drainage within a few days after application will affect the weeding effect.
Main reference materials
[1] Research progress on the metabolic mechanism of organophosphorus pesticides
[2] CN201710852148.1 A herbicidal composition containing triazosultrione and its application
