Tam sim no peb tham txog cov tshuaj tua kab nicotinic dinotefuran tiam thib peb, cia peb xub txheeb xyuas qhov kev faib tawm ntawm cov tshuaj tua kab nicotinic.
Cov khoom nicotine thawj tiam: imidacloprid, nitenpyram, acetamiprid, thiacloprid. Cov khoom nruab nrab tseem ceeb yog 2-chloro-5-chloromethylpyridine, uas yog pawg chloropyridyl.
Cov khoom nicotine tiam ob: thiamethoxam), clothianidin. Cov khoom nruab nrab tseem ceeb yog 2-chloro-5-chloromethylthiazole, uas yog ib feem ntawm pawg chlorothiazolyl.
Lub tiam thib peb ntawm cov khoom nicotine: dinotefuran, pawg tetrahydrofuran hloov pawg chloro, thiab tsis muaj cov ntsiab lus halogen.
Lub tshuab ua haujlwm ntawm nicotine tua kab yog ua rau lub paj hlwb ntawm cov kab, ua rau lawv zoo siab, tuag tes tuag taw thiab tuag, thiab kuj muaj cov teebmeem ntawm kev sib cuag thiab kev lom plab. Piv nrog rau cov nicotine ib txwm muaj, dinotefuran tsis muaj cov ntsiab lus halogen, thiab nws cov dej solubility muaj zog dua, uas txhais tau tias dinotefuran yooj yim nqus tau; thiab nws qhov kev lom rau muv tsuas yog 1/4.6 ntawm thiamethoxam, kev lom rau kev sib cuag yog ib nrab ntawm thiamethoxam.
Txij li thaum Lub Yim Hli 30, 2022, kuv lub teb chaws muaj 25 daim ntawv pov thawj rau kev sau npe rau cov khoom siv dinotefuran; 164 daim ntawv pov thawj rau kev sau npe rau ib koob tshuaj thiab 111 daim ntawv pov thawj rau kev sib xyaw, suav nrog 51 tshuaj tua kab mob huv.
Cov ntawv sau tshuaj suav nrog cov hmoov uas yaj tau, cov tshuaj uas dai, cov hmoov uas yaj tau hauv dej, cov tshuaj uas dai noob, cov tshuaj uas dai, cov hmoov, thiab lwm yam, thiab cov ntsiab lus ntawm ib koob tshuaj yog 0.025% -70%.
Cov khoom sib xyaw suav nrog pymetrozine, spirotetramat, pyridaben, bifenthrin, thiab lwm yam.
01 Dinotefuran + Pymetrozine
Pymetrozine muaj cov nyhuv zoo heev rau kev xa cov kab mob mus rau hauv lub cev, thiab qhov ua haujlwm sai ntawm dinotefuran yog qhov zoo ntawm cov khoom no. Ob qho tib si muaj cov txheej txheem ua haujlwm sib txawv. Thaum siv ua ke, cov kab tuag sai thiab cov nyhuv kav ntev.02Dinotefuran + Spirotetramat
Cov mis no yog cov mis nemesis ntawm aphids, thrips, thiab whiteflies. Nyob rau hauv xyoo tas los no, los ntawm kev txhawb nqa thiab siv ntawm ntau qhov chaw thiab cov neeg siv cov lus tawm tswv yim, qhov cuam tshuam tseem zoo heev.
03Dinotefuran + Pyriproxyfen
Pyriproxyfen yog ib yam tshuaj tua qe uas muaj txiaj ntsig zoo, thaum dinotefuran tsuas yog siv tau rau cov neeg laus xwb. Kev sib xyaw ua ke ntawm ob yam no tuaj yeem tua tag nrho cov qe. Cov mis no yog ib qho khub zoo heev.
04Cov tshuaj tua kab Dinotefuran + Pyrethroid
Cov mis no muaj peev xwm ua kom cov tshuaj tua kab zoo dua qub. Cov tshuaj tua kab pyrethroid lawv tus kheej yog cov tshuaj tua kab dav dav. Kev sib xyaw ua ke ntawm ob qho no tuaj yeem txo qhov kev tiv thaiv tshuaj, thiab tseem tuaj yeem kho cov kab ntsaum. Nws yog ib qho mis uas cov chaw tsim khoom tau tshaj tawm dav dav hauv xyoo tas los no.
Kev daws teeb meem
Cov tshuaj intermediates tseem ceeb ntawm dinotefuran yog tetrahydrofuran-3-methylamine thiab O-methyl-N-nitroisourea.
Kev tsim cov tetrahydrofuran-3-methylamine feem ntau yog concentrated hauv Zhejiang, Hubei thiab Jiangsu, thiab lub peev xwm tsim khoom txaus los ua kom tau raws li kev siv dinotefuran.
Kev tsim cov O-methyl-N-nitroisourea feem ntau yog nyob hauv Hebei, Hubei thiab Jiangsu. Nws yog qhov tseem ceeb tshaj plaws ntawm dinotefuran vim yog cov txheej txheem txaus ntshai uas koom nrog nitrification.
01Dinotefuran muaj ntau yam tshuaj tua kab thiab ntau yam kev siv, txij li tshuaj tua kab mus rau tshuaj huv, txij li kab me mus rau kab loj, thiab muaj txiaj ntsig zoo rau kev tswj hwm.
02Kev sib xyaw zoo, dinotefuran tuaj yeem sib xyaw nrog ntau yam tshuaj tua kab thiab tshuaj tua kab mob fungal, uas yooj yim siv; cov qauv yog nplua nuj, thiab nws tuaj yeem ua rau cov chiv granule, cov neeg sawv cev txheej noob rau kev hnav noob, thiab tus neeg sawv cev ncua rau kev txau.
03Mov siv los tswj cov kab tsuag uas loj hlob sai thiab cov kab tsuag uas loj hlob sai nrog ib hom tshuaj thiab tua tau ob hom kab. Nws pheej yig thiab yuav yog lub sijhawm loj rau kev loj hlob ntawm dinotefuran yav tom ntej.
04Vim muaj kev nyiam siv tshuaj tiv thaiv kev ya dav hlau, dinotefuran yooj yim yaj hauv dej, ua rau nws tsim nyog siv rau kev tiv thaiv kev ya dav hlau ntau. Kev nrov npe ntawm kev tiv thaiv kev ya dav hlau yuav muab lub sijhawm ua lag luam tsawg rau kev txhim kho dinotefuran yav tom ntej.
05D-enantiomer ntawm dinotefuran feem ntau muab cov tshuaj tua kab, thaum L-enantiomer muaj tshuaj lom heev rau cov muv Italian. Nws ntseeg tias nrog kev tshawb pom ntawm cov thev naus laus zis purification, dinotefuran, uas yog tus phooj ywg ib puag ncig ntau dua, yuav tawg los ntawm nws tus kheej txoj kev loj hlob bottleneck.
06Tsom mus rau cov qoob loo tshwj xeeb, vim tias cov kab laug sab thiab cov kab laug sab qej tiv taus cov tshuaj lom neeg ntau dua, dinotefuran tau ua tau zoo hauv kev tswj cov kab tsuag kab laug sab, thiab kev siv dinotefuran hauv cov qoob loo tshwj xeeb kuj tseem yuav muab cov lag luam tshiab thiab cov lus qhia rau kev txhim kho dinotefuran.
07Kev txhim kho kom zoo thiab pheej yig. Qhov teeb meem loj tshaj plaws uas cuam tshuam rau kev loj hlob ntawm dinotefuran yeej ib txwm yog tus nqi siab ntawm cov tshuaj qub thiab tus nqi siv siab ntawm kev npaj tshuaj kawg. Txawm li cas los xij, tus nqi ntawm dinotefuran tam sim no nyob rau theem qis dua hauv keeb kwm. Nrog rau kev poob qis ntawm tus nqi, qhov piv ntawm tus nqi-kev ua tau zoo ntawm dinotefuran tau dhau los ua qhov tseem ceeb dua. Peb ntseeg tias kev txhim kho ntawm qhov piv ntawm tus nqi-kev ua tau zoo muab ntau txoj hauv kev rau kev loj hlob yav tom ntej ntawm dinotefuran.
Lub sijhawm tshaj tawm: Cuaj hlis-21-2022