The direct-seeded rice has entered the break period. There are many black-tailed leafhoppers in the field. It is useless to use chlorpyrifos, bupropion, and omethoate to prevent and treat. Some people say that the effect of phoxim is good. What harm will it have for rice? What medicine is most effective?
Chlorpyrifos, phoxim, and omethoate are all organophosphorus pesticides. They all have certain control effects on black-tailed leafhoppers. Normal use is safe for rice, but its effective period is short. The word “buprofen†mentioned in the text message is a buprofezin preparation, and it also has better control effect on the black-tailed leafhopper, but its mechanism of action is to inhibit the molting of insects, so the killing effect on the adult worms is poor and cannot be applied after application. Adults with winged leafhoppers and older nymphs are killed. It is best to prevent and control rice planthoppers in the stage of rice breakage and heading, and control with isoprocarb plus pymetrozine or nitenpyram.
Solid Phase Extraction (SPE) Sorbent
Solid Phase Extraction (SPE) is a column chromatographic analysis process bearing much similarity to high performance liquid chromatography (HPLC) in the mechanism of separation and choice of reagents and solvents.In the past, monodisperse sorbents are only used in high-end chromatography and analysis columns. Under optical microscope, the first generation silica sorbents are irregular in shape and the second generation spherical polymer particles are broad in size distribution. The new generation Uni series SPE sorbents by Nano-Micro Tech is spherical with a uniform particle size. They also have a high surface area and high density of functional groups on the particle surface.
Solid Phase Extraction (Spe) Sorbent,Separation And Choice Of Reagents,Separation And Choice Of Solvents
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